LegalizeThe Water Supply (Water Quality) Regulations 2018
- (2) In this regulation “specified relevant suppliers” means relevant suppliers—
- (a) who use the same water supply zone for the purposes of supplying water to consumers; and
- (b) for the purposes of that supply, rely on an authorised departure relating to the same facts.
Revocation and modification of authorisations
25
- (1) Subject to paragraphs (2) and (4), the Welsh Ministers may at any time modify or revoke an authorisation under regulation 22.
- (2) Subject to paragraph (3) the Welsh Ministers must not revoke or modify an authorisation under regulation 22 without giving at least 6 months' notice in writing of their intention to do so to—
- (a) the relevant supplier to which the authorisation relates;
- (b) any other relevant supplier which, for the purposes of supplying water to consumers, uses the water supply zone in respect of which the authorised departure has been given;
- (c) every appropriate local authority;
- (d) the Public Health Wales National Health Service Trust;
- (e) where the authorisation relates to a water supply zone which is wholly or partly in England, Public Health England ; and
- (f) the Council.
- (3) The Welsh Ministers may revoke or vary an authorisation under regulation 22 without notice if it appears to the Welsh Ministers that immediate revocation or modification is required in the interests of public health.
- (4) A relevant supplier on whose application a departure has been authorised under this Part must notify the Welsh Ministers as soon as the circumstances which gave rise to the application cease to exist; and the Welsh Ministers will thereupon revoke the authorisation without the need for prior notice.
PART 8 — Water Treatment
Disinfection and other treatment arrangements
26
- (1) Unless the conditions in paragraph (5) are satisfied, before supplying water for regulation 4(1) purposes, a water undertaker or supplementary licensee must—
- (a) disinfect the water; and
- (b) where necessary, subject the water to sufficient preliminary treatment to prepare it for disinfection.
- (2) A water undertaker or supplementary licensee must—
- (a) design, operate and maintain the disinfection process so as to keep the presence of disinfection by-products as low as possible without compromising the effectiveness of the disinfection; and
- (b) verify the effectiveness of the disinfection process.
- (3) Paragraph (4) applies when any property, organism or substance is present in a water source at a level that may constitute a potential danger to human health.
- (4) Unless the conditions in paragraph (5) are satisfied, before supplying water for regulation 4(1) purposes using water from any source, a water undertaker or supplementary licensee must design and continuously operate an adequate treatment process for water from the source.
- (5) The conditions are that the water undertaker or supplementary licensee —
- (a) must supply water from the treatment works as a matter of urgency in order to prevent an unexpected interruption in piped supply to customers; and
- (b) before the supply is made, has taken all necessary steps to inform consumers that the water is not disinfected or adequately treated.
- (6) For the purposes of this regulation—
- (a) “adequate treatment process” means a process of blending or purification treatment which—
- (i) Removes; or
- (ii) renders harmless the value or concentration of, any property of, organism or substance in, water, so that supplies do not constitute a potential danger to human health;
- (b) “sufficient preliminary treatment” means the treatment necessary—
- (i) to remove, or to reduce the value or concentration of, any property or substance which would interfere with disinfection; and
- (ii) to reduce turbidity to less than one NTU; and
- (c) water is supplied for regulation 4(1) purposes when it leaves a treatment works.
Risk assessment
27
- (1) This regulation applies to every treatment works and supply system from which water is supplied for regulation 4(1) purposes.
- (2) Every water undertaker or supplementary licensee must carry out a risk assessment of each of its treatment works and connected supply system in order to establish whether there is a significant risk of supplying water from those works or supply system that would constitute a potential danger to human health or is likely to be unwholesome.
- (3) Every water undertaker or supplementary licensee must keep its risk assessments under continuous review.
- (4) The Welsh Ministers may by notice served on a water undertaker or supplementary licensee, require a risk assessment or review to be carried out by a date specified in the notice.
- (5) Where a water undertaker or supplementary licensee becomes aware of any factors which make it likely that a risk assessment under this regulation would establish that there is a significant risk of supplying water that would constitute a potential danger to human health, or that is likely to be unwholesome, it must serve a notice on the Welsh Ministers specifying the relevant factors.
Procedure following risk assessment and prohibition of supply
28
- (1) As soon as reasonably practicable after a water undertaker or supplementary licensee has carried out a risk assessment or review of such assessment under regulation 27, it must submit to the Welsh Ministers a report of the assessment or review.
- (2) The report must contain—
- (a) a description of the methods used to carry out the assessment or review;
- (b) where the assessment or review establishes that there is no significant risk of supplying water that could constitute a potential danger to human health or could be unwholesome, a statement confirming this; and
- (c) where the assessment or review establishes that measures have been taken to remove a significant risk of supplying water that could constitute a potential danger to human health or could be unwholesome—
- (i) monitoring data which verifies this; and
- (ii) details of those measures.
- (3) Where the assessment or review establishes that there is a significant risk of supplying water that could constitute a potential danger to human health or could be unwholesome, the report must—
- (a) contain a full explanation including details of every property, organism or substance that has been identified as contributing to the risk; and
- (b) specify the measures that the water undertaker or supplementary licensee—
- (i) has made operational as at the date of the report; and
- (ii) intends to make operational, to mitigate the risk.
- (4) Where the Welsh Ministers have received a report which states that there is or has been a significant risk of supplying water that could constitute a potential danger to human health or could be unwholesome, they may, by notice served on the water undertaker or supplementary licensee, require the water undertaker or supplementary licensee—
- (a) to maintain such specified measures for such period of time as the Welsh Ministers consider appropriate to mitigate the risk;
- (b) to review, revise or make operational such specified measures by such date as the Welsh Ministers consider appropriate to mitigate the risk;
- (c) to audit whether the measures have been effective by such means as may be specified;
- (d) not to supply water for regulation 4(1) purposes from specified treatment works or supply systems, or not to so supply unless specified conditions are satisfied; and
- (e) to give the Welsh Ministers such information as they may require to monitor progress towards mitigation of that risk.
- (5) In paragraph (4), “specified” means specified in the notice served under that paragraph.
- (6) The Welsh Ministers may, by notice served on the relevant water undertaker or supplementary licensee, revoke or amend a notice served under paragraph (4).
Water treatment to minimise contamination from pipes
29
- (1) Paragraph (2) applies where there is a risk (“the prescribed risk”) that water supplied by a relevant supplier would, for the reason mentioned in paragraph (3), after leaving the relevant supplier's pipes—
- (a) contain a concentration of copper in excess of 2 mg/litre; or
- (b) contain a concentration of lead in excess of 10 μg/litre.
- (2) Every water undertaker or supplementary licensee which introduces water into the supply system used by the relevant supplier must, subject to paragraph (4), treat the water in such a way as will, in its opinion, eliminate the prescribed risk or reduce it to a minimum.
- (3) The reason referred to in paragraph (1) is the presence in the water of a concentration of copper or lead which is attributable to the fact that copper or lead is the major component of such a pipe as is mentioned in section 68(3)(a) of the Act, or its associated fittings.
- (4) Paragraph (1) will not require a water undertaker or supplementary licensee to treat water—
- (a) if the treatment is unlikely to achieve a significant reduction in the concentration of copper or lead; or
- (b) if treatment is not reasonably practicable.
Replacement of lead pipes
30
- (1) The relevant supplier must modify or replace its part of a pipe where a relevant supplier—
- (a) has received from the owner of premises to which water is so supplied notice in writing—
- (i) of the owner's intention to replace so much of the pipe as belongs to him; and
- (ii) of his desire that the relevant supplier replaces the remainder of the pipe; and
- (b) has reason to believe that water supplied by it for regulation 4(1) purposes from a pipe to which paragraph (2) applies contains, at the consumer's tap, a concentration of lead which exceeds 10 μg/1.
- (2) This paragraph applies to a pipe—
- (a) of which the major component is lead;
- (b) which is subject to water pressure from a water main or would be so subject but for the closing of some valve; and
- (c) of which part belongs to a relevant supplier and of which the remainder belongs to the owner of any premises to which the relevant supplier supplies water for regulation 4(1) purposes.
Application and introduction of substances and products
31
- (1) Subject to paragraph (2), a water undertaker or supplementary licensee must not apply any substance or product to, or introduce any substance or product into, water which is to be supplied for regulation 4(1) purposes unless one of the requirements of paragraph (4) is satisfied.
- (2) A substance or product which, at the time of its application or introduction—
- (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- (b) conforms to an appropriate British Standard or some other appropriate standard ... which provides an equivalent level of protection and performance,
may be applied or introduced, notwithstanding that none of the requirements of paragraph (4) are satisfied.
- (3) Paragraph (2) applies only if such an application or introduction complies with—
- (a) such conditions of use restricting the dosing concentration as are for the time being in force in relation to such substances and products pursuant to a determination of the Welsh Ministers by an instrument in writing;
- (b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- (4) The requirements of this paragraph are—
- (a) that the Welsh Ministers have for the time being approved the application or introduction of that substance or product and it is applied or introduced in accordance with any conditions attaching to that approval;
- (b) that the Welsh Ministers are satisfied that the substance or product either alone or in combination with any other substance or product in the water is unlikely to affect adversely the quality of the water supplied; and
- (c) that the substance or product is to be applied or introduced solely for the purposes of testing or research, and the water undertaker or supplementary licensee has given to the Welsh Ministers not less than 3 months' notice in writing of its intention so to apply or introduce the substance or product.
- (5) An application for such an approval as is mentioned in paragraph (4)(a) may be made by any person.
- (6) If the Welsh Ministers decide to issue an approval under paragraph (4)(a), they may include in the approval such conditions as it considers appropriate and, subject to paragraph (10), may at any time revoke or vary any approval it has previously given.
- (7) Where substances or products are applied or introduced in any case in which the requirement mentioned in paragraph (4)(c) is satisfied, their application or introduction will be discontinued within 12 months of the date on which they were first applied or introduced or, if the Welsh Ministers by notice given in writing to the water undertaker or supplementary licensee so directs, within such other period (whether longer or shorter) as may be specified in the notice.
- (8) The Welsh Ministers may, by notice given in writing to any water undertaker or supplementary licensee, prohibit the water undertaker or supplementary licensee from applying to, or introducing into, water intended to be supplied for regulation 4(1) purposes any substance or product which the water undertaker or supplementary licensee would otherwise be authorised to apply or introduce by virtue of—
- (a) paragraphs (1) and (4)(b) or (c); or
- (b) paragraph (2).
- (9) A prohibition under paragraph (8) may be without limitation as to time or for such period as is specified in the notice.
- (10) Subject to paragraph (11) the Welsh Ministers may—
- (a) revoke by an instrument in writing any approval given by it under paragraph (4)(a);
- (b) modify any such approval by an instrument in writing by including conditions or varying existing conditions;
- (c) give any such notice as is mentioned in paragraph (8);
- (11) Unless the Welsh Ministers are satisfied that it is necessary to do so in the interests of public health without notice, the Welsh Ministers must not do any of those things without giving all such persons as are, in the opinion of the Welsh Ministers, likely to be affected by the revocation or modification of the approval or by the giving of the notice at least 6 months' notice in writing of its intention.
- (12) Notwithstanding paragraph (11), the Welsh Ministers must give immediate notice to all persons likely to be affected by the revocation or variation of an instrument mentioned in paragraph (10)(a) or (b).
- (13) At least once in each year, the Welsh Ministers must issue a list of all the substances and products, with particulars of the action taken, in relation to which—
- (a) an approval under paragraph (4)(a) has been granted or refused;
- (b) such an approval has been revoked or modified; and
- (c) a notice has been given under paragraph (8).
- (14) The Welsh Ministers may—
- (a) by notice served on the person who makes an application for approval under paragraph (4)(a), require the person to pay the Welsh Ministers a charge which reflects the administrative expenses incurred or likely to be incurred by the Welsh Ministers in connection with the application; and
- (b) in determining the amount of any such charge, adopt such methods and principles for its calculation as appear to the Welsh Ministers to be appropriate.
- (15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use of processes
32
- (1) The Welsh Ministers may at any time by notice in writing given to a water undertaker or supplementary licensee require the water undertaker or supplementary licensee to make an application to it for approval of the use of any process; and may prohibit the water undertaker or supplementary licensee for such period as may be specified in the notice from using any such process in connection with the supply by the water undertaker or supplementary licensee of water for regulation 4(1) purposes.
- (2) The Welsh Ministers may refuse the application or impose on any approval given for the purposes of this regulation such conditions as they think fit and, subject to paragraph (3), may at any time by notice in writing to the water undertaker or supplementary licensee revoke an approval so given or modify or revoke any condition imposed by virtue of this paragraph.
- (3) Subject to paragraph (4), unless the Welsh Ministers have given to the water undertaker or supplementary licensee at least 6 months' notice in writing of the Welsh Ministers' intention to revoke, vary or prohibit, as the case may be, the Welsh Ministers must not——
- (a) revoke any approval given for the purposes of this regulation;
- (b) modify any condition imposed by virtue of paragraph (2); or
- (c) prohibit a water undertaker or supplementary licensee from using any process.
- (4) Paragraph (3) does not apply in any case in which the Welsh Ministers are of the opinion that the immediate revocation, modification or prohibition is necessary in the interests of public health.
- (5) Regulation 31(13) applies for the purposes of this regulation as if—
- (a) for the reference to a substance or product there were substituted a reference to a process; and
- (b) for the reference to paragraph (4)(a) and paragraph (8) there were substituted a reference to this regulation and paragraph (1) of this regulation respectively.
Offences
33
- (1) A water undertaker or supplementary licensee which contravenes regulation 26(1) or (4) or the terms of a notice served under regulation 28(4)(d) will be guilty of an offence and liable on summary conviction, or on conviction on indictment, to a fine.
- (2) In any proceedings against a water undertaker or supplementary licensee for an offence under paragraph (1), it will be a defence for that water undertaker or supplementary licensee to show that it took all reasonable steps and exercised all due diligence to avoid the commission of the offence.
- (3) A water undertaker or supplementary licensee which—
- (a) applies or introduces any substance or product in contravention of regulation 31(1) or a notice given under regulation 31(8), or
- (b) uses any process in contravention of a prohibition imposed under regulation 32(1) or without complying with a condition imposed by virtue of regulation 32(2),
will be guilty of an offence and liable on summary conviction, or on conviction on indictment, to a fine.
- (4) If any person, in furnishing any information or making any application under regulation 31 or 32, makes any statement which he or she knows to be false in a material particular, or recklessly makes any statement which is false in a material particular, that person is guilty of an offence and liable on summary conviction, or on conviction on indictment, to a fine.
- (5) Proceedings for an offence under paragraph (4) will not be instituted except by or with the consent of the Welsh Ministers or the Director of Public Prosecutions.
PART 9 — Records and Information
Maintenance of records
34
- (1) Every water undertaker or supplementary licensee must, in respect of each of the water supply zones which it uses for the purposes of supplying water to consumers, prepare and maintain a record containing—
- (a) the name of the zone;
- (b) the name of every water treatment works, service reservoir and other supply point from which water is supplied to premises within the zone;
- (c) an estimate of the population of the zone;
- (d) particulars of any departure authorised under Part 7 of these Regulations which applies to water supplied in the zone;
- (e) particulars of the action taken or required to be taken by the water undertaker or supplementary licensee to comply with—
- (i) any enforcement order made under section 18 of the Act;
- (ii) any departure authorised under Part 7; and
- (iii) any notice under regulation 20(4);
- (f) particulars of the result of any analysis of samples taken in accordance with Part 4 of these Regulations or any of regulations 11 to 13, 17 and 28;
- (g) the results of any electronic monitoring where this is carried out in accordance with these Regulations;
- (h) particulars of all consumer contacts in relation to the discharge of duties under these Regulations; and
- (i) such other particulars as the water undertaker or supplementary licensee may determine.
- (2) A retail licensee must, in respect of each of the water supply zones which it uses for the purposes of supplying water to consumers, prepare and maintain a record containing—
- (a) the name of the water supply zone;
- (b) particulars of any departure authorised under Part 7 of these Regulations which applies to water supplied in the zone;
- (c) particulars of the action taken or required to be taken by the retail licensee to comply with—
- (i) any enforcement order made under section 18 of the Act;
- (ii) any departure authorised under Part 7; and
- (iii) any notice under regulation 20(4);
- (d) particulars of all consumer contacts in relation to the discharge of duties under these Regulations; and
- (e) such other particulars as the retail licensee may determine.
- (3) A water undertaker or supplementary licensee must make entries in the record—
- (a) in respect of the matters mentioned in paragraph (1)(a) to (d) and (e)(ii) as soon as reasonably practicable and no later than 3 months after the day on which it first introduces water into a supply system for the purposes of supplying water to consumers;
- (b) in respect of the matters mentioned in paragraph (1)(e)(i) and (iii) within 28 days of the date of the order and notice respectively; and
- (c) relating to the results of the analysis of samples within 28 days of the day on which the result is first known to the water undertaker or supplementary licensee.
- (4) A retail licensee must make—
- (a) initial entries in the record in respect of the matters mentioned in paragraph (2)(a), (b) and (c)(ii) no later than 3 months after the day on which it first uses a supply system for the purposes of supplying water to consumers; and
- (b) entries in respect of the matters mentioned in paragraph (2)(c)(i) and (iii) within 28 days of the date of the order and notice respectively.
- (5) Without prejudice to paragraph (3), the relevant supplier must at least once in each year review and bring up to date the record required to be kept by paragraph (1) or paragraph (2) (as the case may be).
- (6) Nothing in this regulation will require a relevant supplier to retain a record—
- (a) of information mentioned in any of sub-paragraphs (a), (b) and (f) of paragraph (1) or in paragraph (2)(a) at any time more than 30 years after the date on which the information was first entered in the record;
- (b) of information mentioned in any other sub-paragraph of paragraph (1) or paragraph (2) at any time more than 5 years after the date on which the information was first entered in the record.
Provision of information
35
- (1) Any person may request a relevant supplier to send to the person making the request a copy of any record maintained by the relevant supplier under regulation 34 and the relevant supplier must, within 7 days of the receipt of the request, send a copy of the record requested to the person who requested it.
- (2) A relevant supplier must comply with a request under paragraph (1)—
- (a) in the case of a request relating to a water supply zone, free of charge if the person receives a supply of water in the zone; or
- (b) in any other case, on payment of such reasonable charge as the relevant supplier may determine.
- (3) Paragraph (1) does not oblige a relevant supplier to comply with a request which is vexatious.
- (4) Where a relevant supplier has previously complied with a request which was made by any person, paragraph (1) does not oblige it to comply with a subsequent identical or substantially similar request from that person unless a reasonable interval has elapsed between compliance with the previous request and the making of the subsequent request.
- (5) A water undertaker must include in, or append to, at least one of the accounts sent to each customer in any year a statement informing customers of their rights under paragraph (1).
- (6) As soon as possible after an event which, by reason of its effect or likely effect on the water supplied by a relevant supplier, gives rise or is likely to give rise to a significant risk to human health the relevant supplier must notify—
- (a) in every case—
- (i) every appropriate local authority;
- (ii) the Public Health Wales National Health Service Trust;
- (iii) the Council; and
- (iv) the Welsh Ministers; and
- (b) in any case where the event gives rise or is likely to give rise to a significant risk to human health in England—
- (i) Public Health England; and
- (ii) the Secretary of State.
- (7) Where a person has received a notification under paragraph (6), that person may require the relevant supplier to provide such further information relating to the event and its consequences as that person may reasonably require.
PART 10 — Functions of Local Authorities in Relation to Water Quality
Application and interpretation of this Part
36
- (1) This Part applies to the performance by a local authority of their duty under section 77(1) of the Act (general functions of local authorities in relation to water quality) insofar as that duty relates to water supplies which are not private supplies.
- (2) In this Part “specified relevant supplier”, in relation to a local authority, means—
- (a) a water undertaker any of whose water supply zones include an area which is situated within the area of that authority; or
- (b) a water supply licensee which uses any such water supply zones for the purposes of supplying water to consumers.
Duties of local authorities: supplementary provision
37
- (1) In performing their duty under section 77(1) of the Act, a local authority—
- (a) must make such arrangements with the specified relevant supplier as will secure that the authority is notified as mentioned in regulation 35(6)(a)(i); and
- (b) may take, or cause to be taken, and analyse, or cause to be analysed, by a person designated by them in writing, such samples of the water supplied to premises in their area as they may reasonably require.
- (2) Regulation 15 applies to samples taken by virtue of paragraph (1) as it applies to samples taken for the purposes of Parts 4 and 5 of these Regulations, but regulation 15(1) is to be read as if for the words “water undertaker or supplementary licensee” there were to be substituted “ local authority ”.
PART 11 — Enforcement
Contraventions by relevant suppliers
38
Any duty or requirement imposed by Parts 4 to 9 of these Regulations on a relevant supplier will be enforceable under section 18 of the Act by the Welsh Ministers or the Authority , whether or not the duty or requirement constitutes an offence.
PART 12 — Miscellaneous
Transitional provisions
39
- (1) On the coming into force of these Regulations—
- (a) a notice given under regulation 6A(3) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be a notice given under regulation 6(13) of these Regulations;
- (b) an authorisation under regulation 8(1) or (3) of the 2010 Regulations is taken to be an authorisation given under regulation 8(2) or (4) respectively of these Regulations;
- (c) an authorisation given under regulation 16(7) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be an authorisation under regulation 15(7) of these Regulations;
- (d) a notice given under regulation 17(3), (4) or (5)(b) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be a notice given under regulation 17(3), (4) or (5)(b) respectively of these Regulations;
- (e) a notice given under regulation 20(1) or (4) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be a notice given under regulation 20(1) or (4) respectively of these Regulations;
- (f) a notice given under regulation 21(3) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be a notice given under regulation 21(3) of these Regulations;
- (g) an authorisation given under regulation 22(1) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be an authorisation given under regulation 22(1) of these Regulations;
- (h) any further authorisations given under regulation 23(5) and (7) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations are taken to be further authorisations given under regulation 23(7) ... of these Regulations;
- (i) a notice given under regulation 28(5) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be a notice given under regulation 27(4) of these Regulations;
- (j) a notice given under regulation 29(4) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be a notice given under regulation 28(4) of these Regulations;
- (k) an approval given under regulation 31(4)(a) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be an approval given under regulation 31(4)(a) of these Regulations;
- (l) a notice given under regulation 31(7) or (8) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be a notice given under regulation 31(7) or (8) respectively of these Regulations;
- (m) a notice given under regulation 32(1) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be a notice given under regulation 32(1) of these Regulations; and
- (n) an approval or notice given under regulation 32(2) of the 2010 Regulations which had effect immediately before the coming into force of these Regulations is taken to be an approval or notice respectively given under regulation 32(2) of these Regulations.
- (2) Any variation from the standard number under the 2010 Regulations, as defined in regulation 9 of those Regulations, as in force immediately before the coming into force of these Regulations is to cease upon the coming into force of these Regulations.
- (3) Table A2 in Schedule 5 remains in force until 23:59 on 31 December 2019 following which it is revoked for all purposes.
- (4) Regulation 16 remains in force until 23:59 on 31 December 2019 following which it is revoked for all purposes.
Amendments and revocations
40
- (1) The Regulations specified in Table 1 in Schedule 6 are amended in accordance with the provisions of that Table.
- (2) The Regulations specified in Table 2 in Schedule 6 are revoked to the extent specified in that Table.
SCHEDULE 1 — PRESCRIBED CONCENTRATIONS AND VALUES
| ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | ¹ Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). |
|---|---|---|---|---|
| Part 1: Directive requirements | Part 1: Directive requirements | Part 1: Directive requirements | Part 1: Directive requirements | Part 1: Directive requirements |
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
| 1 | Enterococci | 0 | number/100 ml | Consumers' taps |
| 2 | E.coli | 0 | number/100 ml | Consumers' taps |
| Part 2: National requirements | Part 2: National requirements | Part 2: National requirements | Part 2: National requirements | Part 2: National requirements |
| 1 | Coliform bacteria | 0 | number/100 ml | Service reservoirs ¹ and water treatment works |
| 2 | E. coli | 0 | number/100 ml | Service reservoirs and water treatment works |
| Note: | Note: | Note: | Note: | Note: |
| ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | ¹ The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. |
| --- | --- | --- | --- | --- |
| ² See also regulation 4(2)(d). | ² See also regulation 4(2)(d). | ² See also regulation 4(2)(d). | ² See also regulation 4(2)(d). | ² See also regulation 4(2)(d). |
| ³ See the definition of “pesticides and related products” in regulation 2. | ³ See the definition of “pesticides and related products” in regulation 2. | ³ See the definition of “pesticides and related products” in regulation 2. | ³ See the definition of “pesticides and related products” in regulation 2. | ³ See the definition of “pesticides and related products” in regulation 2. |
| ⁴ The parametric value applies to each individual pesticide. | ⁴ The parametric value applies to each individual pesticide. | ⁴ The parametric value applies to each individual pesticide. | ⁴ The parametric value applies to each individual pesticide. | ⁴ The parametric value applies to each individual pesticide. |
| ⁵ “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | ⁵ “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | ⁵ “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | ⁵ “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | ⁵ “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. |
| ⁶ The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁶ The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁶ The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁶ The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁶ The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(1,2,3-cd)pyrene.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. |
| ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁷ The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. |
| ⁸ The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁸ The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁸ The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁸ The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ⁸ The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. |
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
| 1 | Acrylamide | 0.10 | μg/l | ¹ |
| 2 | Antimony | 5.0 | μgSb/l | Consumers' taps |
| 3 | Arsenic | 10 | μgAs/l | Consumers' taps |
| 4 | Benzene | 1.0 | μg/l | Consumers' taps |
| 5 | Benzo(a)pyrene | 0.010 | μg/l | Consumers' taps |
| 6 | Boron | 1.0 | mgB/l | Consumers' taps |
| 7 | Bromate | 10 | μBrO3/l | Consumers' taps |
| 8 | Cadmium | 5.0 | μgCd/l | Consumers' taps |
| 9 | Chromium | 50 | μgCr/l | Consumers' taps |
| 10 | Copper | 2.0 | mgCu/l | Consumers' taps |
| 11 | Cyanide | 50 | μgCN/l | Consumers' taps |
| 12 | 1, 2 dichloroethane | 3.0 | μg/l | Consumers' taps |
| 13 | Epichlorohydrin | 0.10 | μg/l | ¹ |
| 14 | Fluoride | 1.5 | mgF/l | Consumers' taps |
| 15 | Lead | 10 | μgPb/l | Consumers' taps |
| 16 | Mercury | 1.0 | μgPb/l | Consumers' taps |
| 17 | Nickel | 20 | μgNi/l | Consumers' taps |
| 18 | Nitrate ² | 50 | mgNO3/l | Consumers' taps |
| 19 | Nitrite ² | 0.50 | mgNO2/l | Consumers' taps |
| 0.10 | Treatment Works | |||
| 20 | Pesticides ³,⁴ | |||
| 20 | Aldrin | 0.030 | μg/l | Consumers' taps |
| 20 | Dieldrin | |||
| 20 | Heptachlor | |||
| 20 | Heptachlor | |||
| 20 | epoxide | |||
| 20 | other pesticides | 0.10 | μg/l | Consumers' taps |
| 21 | Pesticides: Total ⁵ | 0.50 | μg/l | Consumers' taps |
| 22 | Polycyclic aromatic hydrocarbons ⁶ | 0.10 | μg/l | Consumers' taps |
| 23 | Selenium | 10 | μgSe/l | Consumers' taps |
| 24 | Tetrachloroethene and Trichloroethene ⁷ | 10 | μg/l | Consumers' taps |
| 25 | Trihalomethanes: Total ⁸ | 100 | μg/l | Consumers' taps |
| 26 | Vinyl chloride | 0.50 | μg/l | ¹ |
| Notes: | Notes: | Notes: | Notes: | Notes: |
| Item | Parameters | Concentration or Value (maximum unless otherwise stated) | Units of Measurement | Point of compliance |
| --- | --- | --- | --- | --- |
| 1 | Aluminium | 200 | μgAl/l | Consumers' taps |
| 2 | Colour | 20 | mg/l Pt/Co | Consumers' taps |
| 3 | Iron | 200 | μgFe/l | Consumers' taps |
| 4 | Manganese | 50 | μgMn/l | Consumers' taps |
| 5 | Odour | Acceptable to consumers and no abnormal change | Consumers' taps | |
| 6 | Sodium | 200 | mgNa/l | Consumers' taps |
| 7 | Taste | Acceptable to consumers and no abnormal change | … | Consumers' taps |
| 8 | Tetrachlorome-thane | 3 | μg/l | Consumers' taps |
| 9 | Turbidity | 4 | NTU | Consumers' taps |
SCHEDULE 2 — INDICATOR PARAMETERS
| ¹ The water should not be aggressive. | ¹ The water should not be aggressive. | ¹ The water should not be aggressive. | ¹ The water should not be aggressive. | ¹ The water should not be aggressive. |
|---|---|---|---|---|
| ² Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | ² Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | ² Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | ² Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | ² Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. |
| ³ Remedial action may be taken by the Welsh Ministers on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. | ³ Remedial action may be taken by the Welsh Ministers on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. | ³ Remedial action may be taken by the Welsh Ministers on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. | ³ Remedial action may be taken by the Welsh Ministers on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. | ³ Remedial action may be taken by the Welsh Ministers on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. |
| ⁴ If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. | ⁴ If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. | ⁴ If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. | ⁴ If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. | ⁴ If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. |
| ⁵ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | ⁵ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | ⁵ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | ⁵ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | ⁵ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. |
| Item Parameters | Specification | Concentration or Value (maximum unless otherwise stated) or State | Units of Measurement | Point of compliance |
| 1 | Ammonium | 0.50 | μgAl/l | Consumers' taps |
| 2 | Chloride ¹ | 250 | mgCl/l | Supply point ⁵ |
| 3 | Clostridium perfringens (including spores) | 0 | Number/100 ml | Supply point ⁵ |
| 4 | Coliform bacteria | 0 | Number/100 ml | Consumers' taps |
| 5 | Colony counts | No abnormal change | Number/1 ml at 22°C | Consumers' taps, service reservoirs and treatment works |
| 6 | Conductivity ¹ | 2500 | μS/cm at 20°C | Supply point ⁵ |
| 7 | Hydrogen ion | 9.5 | pHvalue | Consumers' taps |
| 6.5 (minimum) | ||||
| 8 | Indicative dose ² | 0.10 | mSv | Supply point ⁵ |
| (a) gross alpha | 0.1 | Bq/l | Supply point ⁵ | |
| (b) gross beta | 1 | Bq/l | Supply point ⁵ | |
| 9 | Radon ³ | 100 | Bq/l | Supply point |
| 10 | Sulphate 1 | 250 | mgSO4/l | Supply point ⁵ |
| 11 | Total organic carbon (TOC) | No abnormal change | mgC/l | Supply point |
| 12 | Tritium (for radioactivity) ⁴ | 100 | Bq/l | Supply point |
| 13 | Turbidity | 1 | NTU | Treatment works |
| Notes: | Notes: | Notes: | Notes: | Notes: |
SCHEDULE 3 — MONITORING
Part 1 — Group A and Group B Parameters
| ¹ Sampling for this parameter in water supply zones may be substituted by sampling at supply points. | ¹ Sampling for this parameter in water supply zones may be substituted by sampling at supply points. | ¹ Sampling for this parameter in water supply zones may be substituted by sampling at supply points. |
|---|---|---|
| Item number (1) | Parameter (2) | Circumstances (3) |
| 1 | Aluminium | Where used as a water treatment chemical or where the water originates from, or is influenced by, surface waters |
| 2 | Ammonium | Where chloramination is practised |
| 3 | Coliform bacteria | In all circumstances |
| 4 | Colony counts 22 ° C | In all circumstances |
| 5 | Colour | In all circumstances |
| 6 | Conductivity¹ | In all circumstances |
| 7 | E. coli | In all circumstances |
| 8 | Hydrogen ion | In all circumstances |
| 9 | Iron | Where used as a water treatment chemical or where the water originates from, or is influenced by, surface waters |
| 10 | Manganese | Where the water originates from, or is influenced by, surface waters |
| 11 | Nitrate | Where chloramination is practised |
| 12 | Nitrite | Where chloramination is practised |
| 13 | Odour | In all circumstances |
| 14 | Residual disinfectant | In all circumstances |
| 15 | Taste | In all circumstances |
| 16 | Turbidity | In all circumstances |
| Note: | Note: | Note: |
| Item number | Parameter (2) | Circumstances |
| --- | --- | --- |
| (1) Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2). | (1) Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2). | (1) Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2). |
| (2) Monitoring of this parameter in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, monitoring is required at supply points, see Group B2. | (2) Monitoring of this parameter in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, monitoring is required at supply points, see Group B2. | (2) Monitoring of this parameter in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, monitoring is required at supply points, see Group B2. |
| (3) To monitor for indicative dose. | (3) To monitor for indicative dose. | (3) To monitor for indicative dose. |
| (4) In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. | (4) In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. | (4) In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. |
| 1 | Aluminium | Where— (i) not used as a water treatment chemical; or (ii) the water neither originates from, nor is influenced by, surface waters. |
| 2 | Ammonium | Where chloramination is not practised |
| 3 | Antimony | In all circumstances |
| 4 | Arsenic | In all circumstances |
| 5 | Benzene [^f01015] | In all circumstances |
| 6 | Benzo(a)pyrene | In all circumstances |
| 7 | Boron [^f01015] | In all circumstances |
| 8 | Bromate [^f01016] | In all circumstances |
| 9 | Cadmium | In all circumstances |
| 10 | Chloride [^f01015] | In all circumstances |
| 11 | Chromium | In all circumstances |
| 12 | Clostridium perfringens (including spores) | In all circumstances |
| 13 | Copper | In all circumstances |
| 14 | Cyanide [^f01015] | In all circumstances |
| 15 | 1, 2 dichloroethane [^f01015] | In all circumstances |
| 16 | Enterococci | In all circumstances |
| 17 | Fluoride [^f01015] | In all circumstances |
| 18 | Gross alpha [^f01015] [^f01017] [^f01018] | In all circumstances |
| 19 | Gross beta [^f01015] [^f01017] [^f01018] | In all circumstances |
| 20 | Iron | Where— (i) not used as a flocculant; or (ii) the water neither originates from, nor is influenced by, surface waters. |
| 21 | Lead | In all circumstances |
| 22 | Manganese | Where the water neither originates from, nor is influenced by, surface waters. |
| 23 | Mercury [^f01015] | In all circumstances |
| 24 | Nickel | In all circumstances |
| 25 | Nitrate | Where chloramination is not practised. |
| 26 | Nitrite | Where chloramination is not practised. |
| 27 | Pesticides and related products [^f01015] | In all circumstances |
| 28 | Polycyclic aromatic hydrocarbon | In all circumstances |
| 29 | Radon [^f01015] [^f01018] | In all circumstances |
| 30 | Selenium | In all circumstances |
| 31 | Sodium | In all circumstances |
| 32 | Sulphate [^f01015] | In all circumstances |
| 33 | Tetrachloroethene [^f01015] | In all circumstances |
| 34 | Tetrachloromethane [^f01015] | In all circumstances |
| 34 | Total organic carbon [^f01015] | In all circumstances |
| 35 | Trichloroethene | In all circumstances |
| 35 | Trihalomethanes: Total | In all circumstances |
| 36 | Tritium [^f01015] [^f01018] | In all circumstances |
| Notes: | Notes: | Notes: |
| ¹ Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2). | ¹ Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2). | ¹ Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2). |
| --- | --- | --- |
| ² Monitoring is required at supply points where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, see Group B1. | ² Monitoring is required at supply points where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, see Group B1. | ² Monitoring is required at supply points where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, see Group B1. |
| ³ To monitor for indicative dose. | ³ To monitor for indicative dose. | ³ To monitor for indicative dose. |
| ⁴ In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. | ⁴ In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. | ⁴ In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. |
| Item number | Parameter ² | Circumstances |
| 1 | Benzene ¹ | In all circumstances |
| 2 | Boron ¹ | In all circumstances |
| 3 | Bromate ² | In all circumstances |
| 4 | Chloride ¹ | In all circumstances |
| 5 | Colstridium perfringens (including spores)⁽¹⁾ | In all circumstances |
| 6 | Cyanide ¹ | In all circumstances |
| 7 | 1, 2 dichloroethane ¹ | In all circumstances |
| 8 | Fluoride ¹ | In all circumstances |
| 9 | Gross alpha ¹³⁴ | In all circumstances |
| 10 | Gross beta ¹³⁴ | In all circumstances |
| 11 | Indicative dose ⁽¹⁾ | In all circumstances |
| 12 | Mercury ¹ | In all circumstances |
| 13 | Nitrite | When chloramination is not practised. |
| 14 | Pesticides and related products ¹ | In all circumstances |
| 15 | Radon ¹⁴ | In all circumstances |
| 16 | Sulphate ¹ | In all circumstances |
| 17 | Tetrachloroethene/Trichloroethene⁽¹⁾ | In all circumstances |
| 18 | Tetrachloromethane ¹ | In all circumstances |
| 19 | Total organic carbon ¹ | In all circumstances |
| 20 | . . . | . . . |
| 21 | Tritium ¹⁴ | In all circumstances |
| Notes: | Notes: | Notes: |
| Item number | Parameter | |
| --- | --- | |
| 1 | Coliform bacteria | |
| 2 | E. coli | |
| 3 | Residual disinfectant | |
| Item number | Parameter | |
| --- | --- | |
| 1 | Coliform bacteria | |
| 2 | Colony counts 22° C | |
| 3 | E.coli | |
| 4 | Nitrite | |
| 5 | Residual disinfectant | |
| 6 | Turbidity | |
| Item number | Parameter | |
| --- | --- | |
| 1 | Conductivity | |
| Item number | Parameter | |
| --- | --- | |
| 1 | Aluminium | |
| 2 | Ammonium | |
| 3 | Colony counts 22° C | |
| 4 | Colour | |
| 5 | Conductivity | |
| 6 | Hydrogen ion | |
| 7 | Iron | |
| 8 | Manganese | |
| 9 | Nitrate | |
| 10 | Nitrite | |
| 11 | Odour | |
| 12 | Taste | |
| 13 | Turbidity |
PART 2 — Annual sampling frequencies: water supply zones
Table 8
Annual sampling frequencies for Group A4 parameters: water supply zones
Note:
This table and each table which follows it in this Part set out the annual sampling frequencies for all the substances and parameters comprising each of the groups to which they correspond, those groups having been outlined in Part 1 of this Schedule. These are determined for each water supply zone according to its estimated population (as specified in column one of each table in this Part). The number of samples to be taken is the standard number specified in column 2, unless a notice varying this number has been given under regulation 9.
| Estimated population of water supply zone | Standard sampling frequency per year |
|---|---|
| <100 | 2 |
| 100-4,999 | 4 |
| 5,000—9,999 | 12 |
| 10,000-29,999 | 24 |
| 30,000-49,999 | 36 |
| 50,000-79,999 | 52 |
| 80,000-100,000 | 76 |
| Estimated population of water supply zone | Standard sampling frequency per year |
| --- | --- |
| <100 | 1 |
| 100-4,999 | 4 |
| 5,000-100,000 | 8 |
| Estimated population of water supply zone | Standard sampling frequency per year |
| --- | --- |
| <100 | 4 |
| ≥100 | 12 per 5,000 population |
Note:
For the purposes of this Table, where the population is not an exact multiple of 5,000, the population figure must be rounded up to the nearest multiple of 5,000.
PART 3 — Annual sampling frequencies: treatment works and supply points
Table 11
Annual sampling frequencies for Group A2 parameters: treatment works or supply points
Note: This table and each table which follows it in this Part set out the annual sampling frequencies for all the substances and parameters comprising each of the groups to which they correspond at treatment works or supply points, those groups having been outlined in Part 1 of this Schedule. The frequencies are determined according to the volume of water supplied at each treatment works or supply point. The number of samples to be taken is the standard number specified in column 2, unless a notice varying this number has been issued under regulation 9.
| Volume of water supplied m ³/day | Standard sampling frequency per year |
|---|---|
| <20 | 4 |
| 20-1,999 | 52 |
| 2,000-5,999 | 104 |
| 6,000-11,999 | 208 |
| ≥12,000 | 365 |
| Volume of water supplied m ³/day | Standard sampling frequency per year |
| --- | --- |
| <20 | 2 |
| 20-999 | 4 |
| 1,000-1999 | 12 |
| 2,000-5,999 | 24 |
| 6,000-9,999 | 36 |
| 10,000-15,999 | 52 |
| 16,000-32,999 | 104 |
| 33,000-49,999 | 156 |
| 50,000-67,999 | 208 |
| 68,000-84,999 | 260 |
| 85,000-101,999 | 312 |
| 102,000-119,999 | 365 |
| 120,000-241,999 | 730 |
| 242,000-484,999 | 1,460 |
| 485,000-728,999 | 2,190 |
| Volume of water supplied m ³/day | Standard sampling frequency per year |
| --- | --- |
| <20 | 1 |
| 20-999 | 4 |
| 1,000-49,999 | 8 |
| 50,000-89,999 | 12 |
| 90,000-299,999 | 24 |
| 300,000-649,999 | 36 |
| ≥650,000 | 48 |
SCHEDULE 4 — Monitoring for indicative dose and analytical performance characteristics
Monitoring for compliance with the indicative dose
1
- (1) A water undertaker may use reliable screening strategies to indicate the presence of radioactivity in water intended for human consumption.
- (2) The strategies may include screening for–
- (a) certain radionuclides or individual radionuclide; or
- (b) gross alpha activity or gross beta activity (where appropriate gross beta activity may be replaced by residual beta activity after subtraction of the K-40 activity concentration).
Screening for certain radionuclides, or screening for an individual radionuclide
2
- (1) If one of the activity concentrations exceeds 20% of the corresponding derived value or the tritium concentration exceeds its parametric value listed in Schedule 2 an analysis of additional radionuclides is required.
- (2) In deciding which radionuclides are required to be measured for each supply, a water undertaker must take into account all relevant information about likely sources of radioactivity.
Screening strategies for gross alpha activity and gross beta activity
3
- (1) A water undertaker may use a screening strategy for gross alpha and gross beta to monitor for the parametric indicator value for indicative dose.
- (2) Subject to sub-paragraph (3) the recommended screening values are—
- (a) 0,1Bq/l for gross alpha activity; and
- (b) 1,0Bq/l for gross beta activity .
- (3) If the gross alpha activity exceeds 0,1Bq/l or the gross beta activity exceeds 1,0Bq/l, analysis for specific radionuclides is required.
- (4) The Welsh Ministers may set alternative screening levels for gross alpha activity and gross beta activity where it can be demonstrated by the water undertaker that the alternative levels are in compliance with an indicative dose of 0,1 mSv.
- (5) The radionuclides to be measured must be based on all relevant information about likely sources of radioactivity.
Calculation of the indicative dose
4
- (1) The indicative dose must be calculated from—
- (a) the measured radionuclide concentrations and the dose coefficients referred to as “standard values and relationships” in Article 13, and recommended for the estimation of doses from internal exposure in the definition of “standard values and relationships” in Article 4(96), of Council Directive 2013/59/Euratom laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation ;or
- (b) more recent information recognised by the Welsh Ministers, on the basis of the annual intake of water (730 l for adults).
- (2) Where the following formula is satisfied, it can be assumed that the indicative dose is less than the parametric value of 0,1 mSv and no further investigation is required—
$$∑ i = 1 n C i ( o b s ) C i ( d e r ) ≤ 1$where—“Ci(obs)” means observed concentration of radionuclide I;“Ci(der)” means derived concentration of radionuclide i;“n” means number of radionuclides detected.$
| ¹ This table allows only for the radiological properties of uranium, not for its chemical toxicity. | ¹ This table allows only for the radiological properties of uranium, not for its chemical toxicity. | ¹ This table allows only for the radiological properties of uranium, not for its chemical toxicity. |
|---|---|---|
| Origin | Nuclide | Derived concentration |
| Natural | U-238 ¹ | 3,0 Bq/1 |
| U-234 ¹ | 2,8 Bq/1 | |
| Ra-226 | 0,5 Bq/1 | |
| Ra-228 | Ra-228 | |
| Pb-210 | 0,2 Bq/1 | |
| Po-210 | 0,1 Bq/1 | |
| Artificial | C-14 | 240 Bq/1 |
| Sr-90 | 4,9 Bq/1 | |
| Pu-239/Pu-240 | 0,6 Bq/1 | |
| Am-241 | 0,7 Bq/1 | |
| Co-60 | 40 Bq/1 | |
| Cs-134 | 7,2 Bq/1 | |
| Cs-137 | 11 Bq/1 | |
| 1-131 | 6,2 Bq/1 | |
| ¹ The limit of detection must be calculated according to the ISO standard 11929: Determination of the characteristic limits (decision threshold, detection limit, and limits of confidence interval) for measurements of ionising radiation – Fundamentals and application, with probabilities of errors of 1st and 2nd kind of 0,05 each. | ¹ The limit of detection must be calculated according to the ISO standard 11929: Determination of the characteristic limits (decision threshold, detection limit, and limits of confidence interval) for measurements of ionising radiation – Fundamentals and application, with probabilities of errors of 1st and 2nd kind of 0,05 each. | ¹ The limit of detection must be calculated according to the ISO standard 11929: Determination of the characteristic limits (decision threshold, detection limit, and limits of confidence interval) for measurements of ionising radiation – Fundamentals and application, with probabilities of errors of 1st and 2nd kind of 0,05 each. |
| --- | --- | --- |
| ² Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded uncertainties with an expansion factor of 1,96 according the ISO Guide for the Expression of Uncertainty in Measurement. | ² Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded uncertainties with an expansion factor of 1,96 according the ISO Guide for the Expression of Uncertainty in Measurement. | ² Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded uncertainties with an expansion factor of 1,96 according the ISO Guide for the Expression of Uncertainty in Measurement. |
| ³ The limit of detection for tritium and for radon is 10% of its parametric value of 100 Bq/1. | ³ The limit of detection for tritium and for radon is 10% of its parametric value of 100 Bq/1. | ³ The limit of detection for tritium and for radon is 10% of its parametric value of 100 Bq/1. |
| ⁴ The limit of detection for gross alpha activity and gross beta activities are 40% of the screening values of 0,1 and 1,0 Bq/1 respectively. | ⁴ The limit of detection for gross alpha activity and gross beta activities are 40% of the screening values of 0,1 and 1,0 Bq/1 respectively. | ⁴ The limit of detection for gross alpha activity and gross beta activities are 40% of the screening values of 0,1 and 1,0 Bq/1 respectively. |
| ⁵ This limit of detection applies only to initial screening for indicative dose for a new water source; if initial checking indicates that it is not plausible that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0,08 Bq/1 for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required. | ⁵ This limit of detection applies only to initial screening for indicative dose for a new water source; if initial checking indicates that it is not plausible that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0,08 Bq/1 for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required. | ⁵ This limit of detection applies only to initial screening for indicative dose for a new water source; if initial checking indicates that it is not plausible that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0,08 Bq/1 for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required. |
| Parameters and radionuclides | Limit of detection (Notes ¹,²) | Notes |
| Tritium | 10 Bq/1 | Note ³ |
| Radon | 10 Bq/1 | Note ³ |
| gross alpha | 0,04 Bq/1 | Note ⁴ |
| gross beta | 0,4 Bq/1 | Note ⁴ |
| U-238 | 0,02 Bq/1 | |
| U-234 | 0,02 Bq/1 | |
| Ra-226 | 0,04 Bq/1 | |
| Ra-228 | 0,02 Bq/1 | Note ⁵ |
| Pb-210 | 0,02 Bq/1 | |
| Po-210 | 0,01 Bq/1 | |
| C-14 | 20 Bq/1 | |
| Sr-90 | 0,4 Bq/1 | |
| Pu-239/Pu-240 | 0,04 Bq/1 | |
| Am-241 | 0,06 Bq/1 | |
| Co-60 | 0,5 Bq/1 | |
| Cs-134 | 0,5 Bq/1 | |
| Cs-137 | 0,5 Bq/1 | |
| I-131 | 0,5 Bq/1 | |
| Notes: | Notes: | Notes: |
SCHEDULE 5 — ANALYTICAL METHODOLOGY
| (1) Parameter | (2) Method of analysis |
|---|---|
| E. coli and coliform bacteria | EN ISO 9308-134 or EN ISO 9308-235 |
| Enterococci | EN ISO 7899-236 |
| Pseudomonas aeruginosa | EN ISO 1626637 |
| Enumeration of culturable microorganisms – colony count 22°c | EN ISO 622238 |
| Enumeration of culturable microorganisms – colony count 36°c | EN ISO 6222 |
| Clostridium perfringens including spores | EN ISO 1418939 |
| ... |
|---|
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