The Water Supply (Water Quality) Regulations (Northern Ireland) 2017

• (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 risk to human health or 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 a water undertaker—

• (i) has made operational as at the date of the report, and

• (ii) intends to make operational,

to mitigate the risk.

• (4) Where the Department has received a report which states that there is or has been a significant risk of supplying water that could constitute a risk to human health or be unwholesome, it may, by notice served on a water undertaker, require it—

• (a) to maintain such specified measures for such period of time as it considers appropriate to mitigate the risk;

• (b) to review, revise, or make operational such specified measures by such date as it considers 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 5(1) purposes from specified treatment works, or not to so supply unless specified conditions are satisfied; and

• (e) to give it such information as it 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 Department may, by notice served on a water undertaker, revoke or amend a notice served under paragraph (4).

• (7) Article 30 of the 2006 Order applies to the enforcement by the Department of the duties under this regulation in the same way as it applies to the enforcement by the enforcement authority of the duties to which that Article applies.

Contamination from pipes

32

• (1) Where there is a risk (“the prescribed risk”) that water supplied by the water undertaker would, for the reason mentioned in paragraph (2), after leaving that undertaker's pipes—

• (a) contain a concentration of copper in excess of 2mg/litre; or

• (b) contain a concentration of lead in excess of 10µg/litre,

the water undertaker must, subject to paragraph (3), treat the water in such a way as will, in its opinion, eliminate the prescribed risk or reduce it to a minimum.

• (2) 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 Article 108(3)(a) of the 2006 Order, or its associated fittings.

• (3) Paragraph (1) shall not require the water undertaker 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.

• (4) Where the water undertaker—

• (a) has reason to believe that water supplied by it for regulation 5(1) purposes from a pipe to which paragraph (5) applies contains, at the consumer's tap, a concentration of lead which exceeds 10µg/1; and

• (b) 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 them; and

• (ii) of the owner's desire that the water undertaker replaces the remainder of the pipe,

the water undertaker must modify or replace its part of the pipe.

• (5) This regulation 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) which belongs, as to part, to the water undertaker and, as to the remainder, to the owner of any premises to which the water undertaker supplies water for regulation 5(1) purposes.

Application and introduction of substances and products

33

• (1) Subject to paragraph (2), a water undertaker must not apply any substance or product to, or introduce any substance or product into, water which is to be supplied for regulation 5(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) is 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 Department by an notice in writing; and

• (b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

• (4) The requirements of this paragraph are that—

• (a) the Department has 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) the Department is satisfied that the application or introduction of the substance or product either alone or in combination with any other substance or product in the water is unlikely to adversely affect the quality of the water supplied; or

• (c) the substance or product is to be applied or introduced solely for the purposes of testing or research, and the water undertaker has given to the Department not less than 3 months' notice in writing of its intention so to apply or introduce the substance or product.

• (5) An application for an approval mentioned in paragraph (4)(a) may be made by any person.

• (6) If the Department decides to issue an approval under paragraph (4)(a), the Department may include in the approval such conditions as the Department considers appropriate and, in accordance with paragraph (10), may at any time revoke or vary any approval that the Department 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 must be discontinued within 12 months of the date on which they were first applied or introduced or, if the Department by notice given in writing to the water undertaker so directs, within such other period (whether longer or shorter) as may be specified in the notice.

• (8) The Department may, by notice given in writing to any water undertaker, prohibit it from applying to, or introducing into, water intended to be supplied for regulation 5(1) purposes any substance or product which the water undertaker 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 Department may—

• (a) revoke by notice in writing any approval given under paragraph (4)(a);

• (b) vary any such approval by notice in writing by including conditions or varying existing conditions;

• (c) give any such notice as is mentioned in paragraph (8).

• (11) Unless the Department is satisfied that it is necessary to do so in the interests of public health without notice, the Department must not act under paragraph (10) without giving all such persons as are, in the Department's opinion, likely to be affected by the revocation or variation of the approval or by the giving of the notice, at least 6 months' notice in writing.

• (12) Notwithstanding paragraph (11), the Department 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 Department 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 varied; and

• (c) a notice has been given under paragraph (8).

• (14) The Department may—

• (a) by notice served on the person who makes an application for approval under paragraph (4)(a), require the person to pay the Department a charge which reflects the administrative expenses incurred or likely to be incurred by the Department 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 Department to be appropriate.

• ...

Use of processes

34

• (1) The Department may at any time by notice in writing given to the water undertaker require it to make an application to the Department for approval of the use of any process; and may prohibit it for such period as may be specified in the notice from using any such process in connection with the supply by it of water for regulation 5(1) purposes.

• (2) The Department may refuse the application or impose on any approval given for the purposes of this regulation such conditions as it thinks fit and, subject to paragraph (3), may at any time by notice in writing to the water undertaker revoke an approval so given or modify or revoke any condition imposed by virtue of this paragraph.

• (3) Subject to paragraph (4), the Department 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 the water undertaker from using any process, unless it has given to the undertaker at least six months' notice in writing of its intention to revoke, modify or prohibit, as the case may be.

• (4) Paragraph (3) shall not apply in any case in which the Department is of the opinion that the immediate revocation, modification or prohibition is necessary in the interests of public health.

Offences

35

• (1) A water undertaker which applies or introduces, any substance or product in contravention of regulation 33(1) or a notice given under regulation 33(8), or uses any process in contravention of a prohibition imposed under regulation 34(1) or without complying with a condition imposed by virtue of regulation 34(2) shall be guilty of an offence and liable—

• (a) on summary conviction, to a fine not exceeding the statutory maximum;

• (b) on conviction on indictment, to a fine.

• (2) In any proceedings against a water undertaker for an offence under paragraph (1), it shall be a defence for that water undertaker to show that it took all reasonable steps and exercised all due diligence to avoid the commission of the offence.

PART 10 — RECORDS AND INFORMATION

Maintenance of records

36

• (1) The water undertaker must prepare and maintain, in respect of each of its water supply zones, 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) the details contained within each risk assessment carried out under regulation 30, including a summary of its results;

• (e) particulars of any departure authorised under Part 8 which applies to water supplied in the zone;

• (f) particulars of the action taken or required to be taken by the water undertaker to comply with -

• (i) any departure authorised under Part 8; and

• (ii) any notice under regulation 23(3);

• (g) particulars of the result of any analysis of samples taken in accordance with Part 4 or any of regulations 14 to 17 and 20 and 31; and

• (h) such other particulars as the water undertaker may determine.

• (2) The water undertaker must make—

• (a) entries in respect of the matters mentioned in paragraph (1)(f)(i), where relevant, and (1)(f)(ii) within 28 days of the date of the authorisation and notice respectively; and

• (b) entries 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.

• (3) Without prejudice to paragraph (2) the water undertaker must at least once in each year review and bring up to date the record required to be kept by paragraph (1).

• (4) Nothing in this regulation shall require the water undertaker to retain a record—

• (a) of information mentioned in any of sub-paragraphs (a), (b) and (f) of paragraph (1) 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 that paragraph at any time more than five years after the date on which the information was first entered in the record.

Provision of information

37

• (1) Subject to paragraphs (2), (3), and (4), any person may request a water undertaker to send them a copy of any record maintained by a water undertaker under regulation 36, and a water undertaker must, within ten working days of the receipt of the request, send a copy of the record requested to the person.

• (2) A water undertaker 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 a water undertaker may determine.

• (3) Paragraph (1) does not oblige a water undertaker to comply with a request which is vexatious.

• (4) Where a water undertaker 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 the customer 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 water undertaker, gives rise or is likely to give rise to a significant risk to human health, a water undertaker must notify—

• (a) in every case—

• (i) every appropriate district council;

• (ii) the Public Health Agency (formally known as the Regional Agency for Public Health and Social Well-being and established by section 12 of the Health and Social Care (Reform) Act (Northern Ireland) 2009); and

• (iii) the Department.

• (7) Where a person has received a notification under paragraph (6), they may require a water undertaker to provide them with such further information relating to the event and its consequences as they may reasonably require.

Publication of Information

38

• (1) The water undertaker must, not later than 30th June in each year, publish a report relating to the preceding year containing—

• (a) a statement of the number of treatment works, service reservoirs and other supply points from which it supplied water during any part of that year;

• (b) a statement of the number of its water supply zones for the year;

• (c) a summary of appropriate information of samples taken and any associated departures authorised under Part 8;

• (d) a statement of the action taken by the water undertaker during the year to comply with—

• (i) any departure authorised under Part 8; and

• (ii) any notice served by the Department under these regulations

• (e) a statement of the overall drinking water quality, to include information on microbiological and chemical testing and samples taken; and

• (f) a statement of events and incidents affecting drinking water quality;

• (2) A report under paragraph (1) may include such other information as the water undertaker thinks fit.

• (3) At the same times as it publishes a report in accordance with paragraph (1), the water undertaker must send a copy of it to every district council within whose area it supplied water in the preceding year.

• (4) In addition to the report provided under paragraph (3), the water undertaker must provide appropriate information on drinking water quality specific to every district council.

PART 11 — REVOCATIONS

Revocations

39

The regulations listed in Schedule 6 are revoked.

PART 12 — TRANSITIONAL PROVISIONS

Transitional Provisions

40

• (1) Any authorisation granted by the Department under regulations 8, 16, 20 and 21 of the 2007 Regulations and which has not been revoked or expired by 27 October 2017 shall have effect as if granted under regulation 10, 18, 24 or 25 respectively

• (2) Any notice granted by the Department under regulations 6, 7, 16, 16A, 19, 27, 28, 30 or 31 of 2007 Regulations and which has not been revoked or expired by 27 October 2017 shall have effect as if granted under regulation 8, 9, 18, 20, 23, 30, 31, 33, or 34.

SCHEDULE 1 — PRESCRIBED CONCENTRATIONS AND VALUES

Wholesomeness

¹ Where water is supplied from a tanker see regulation 5(3)(a)	¹ Where water is supplied from a tanker see regulation 5(3)(a)	¹ Where water is supplied from a tanker see regulation 5(3)(a)	¹ Where water is supplied from a tanker see regulation 5(3)(a)	¹ Where water is supplied from a tanker see regulation 5(3)(a)
² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).	² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).	² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).	² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).	² Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).
(1) Item	(2) Parameters	(3) Concentration or Value (maximum)	(4) Unit of measurement	(5) Point of Compliance¹
Part I: Directive requirements	Part I: Directive requirements	Part I: Directive requirements	Part I: Directive requirements	Part I: Directive requirements
1.	Enterococci	0	number/100ml	Consumers' taps
2.	Escherichia coli (E. coli)	0	number/100ml	Consumers' taps
Part II: National requirements	Part II: National requirements	Part II: National requirements	Part II: National requirements	Part II: National requirements
1.	Coliform bacteria	0	number/100ml	Service reservoirs² and water treatment works
2.	Escherichia coli (E. coli)	0	number/100ml	Service reservoirs and water treatment works
(1) Item	(2) Parameters	(3) Concentration or Value (maximum)	(5) Units of Measurement	(6) Point of compliance
---	---	---	---	---
(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) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.	(2) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.	(2) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.	(2) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.	(2) Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.
(3) See also regulation 8(5).	(3) See also regulation 8(5).	(3) See also regulation 8(5).	(3) See also regulation 8(5).	(3) See also regulation 8(5).
(4) See also regulation 5(3)(d).	(4) See also regulation 5(3)(d).	(4) See also regulation 5(3)(d).	(4) See also regulation 5(3)(d).	(4) See also regulation 5(3)(d).
(5) See the definition of “pesticides and related products” in regulation 2.	(5) See the definition of “pesticides and related products” in regulation 2.	(5) See the definition of “pesticides and related products” in regulation 2.	(5) See the definition of “pesticides and related products” in regulation 2.	(5) See the definition of “pesticides and related products” in regulation 2.
(6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.	(6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.	(6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.	(6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.	(6) The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.
(7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.	(7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.	(7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.	(7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.	(7) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.
(8) The specified compounds are benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and 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 benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and 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 benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and 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 benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and 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 benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(9) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(10) The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
Part I: Directive requirements	Part I: Directive requirements	Part I: Directive requirements	Part I: Directive requirements	Part I: Directive requirements
1.	Acrylamide[^f01002]	0.10	µg/l
2.	Antimony	5.0	µg/l	Consumers’ taps
3.	Arsenic	10	µg/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	mg/l	Consumers’ taps
7	Bromate[^f01003]	10	µg/l	Consumers’ taps
8	Cadmium	5.0	µg/l	Consumers’ taps
9	Chromium	50	µg/l	Consumers’ taps
10	Copper[^f01004]	2.0	mg/l	Consumers’ taps
11	Cyanide	50	µg/l	Consumers’ taps
12	1, 2 dichloroethane	3.0	µg/l	Consumers’ taps
13	Epichlorohydrin[^f01002]	0.10	µg/l
14	Fluoride	1.5	mg/l	Consumers’ taps
15	Lead[^f01004]	10	µg/l	Consumers’ taps
16	Mercury	1.0	µg/l	Consumers’ taps
17	Nickel[^f01004]	20	µg/l	Consumers’ taps
18	Nitrate[^f01005]	50	mg/l	Consumers’ taps
19	Nitrite[^f01005]	0.50	mg/l	Consumers’ taps
		0.10		Treatment works
20	Pesticides[^f01006] [^f01007] Aldrin Dieldrin Heptachlor Heptachlor epoxide	0.030	µg/l	Consumers’ taps
	other pesticides[^f01006] [^f01007]	0.10	µg/l	Consumers’ taps
21	Pesticides: Total[^f01008]	0.50	µg/l	Consumers’ taps
22	Polycyclic aromatic hydrocarbons[^f01009]	0.10	µg/l	Consumers’ taps
23	Selenium	10	µg/l	Consumers’ taps
24	Tetrachloroethene and Trichloroethene[^f01010]	10	µg/l	Consumers’ taps
25	Trihalomethanes: Total[^f01011]	100	µg/l	Consumers’ taps
26	Vinyl chloride[^f01002]	0.50	µg/l
Part II: National requirements	Part II: National requirements	Part II: National requirements	Part II: National requirements	Part II: National requirements
1.	Aluminium	200	µg/l	Consumers’ taps
2.	Colour	20	mg/l Pt/Co	Consumers’ taps
3.	Iron	200	µg/l	Consumers’ taps
4.	Manganese	50	µg/l	Consumers’ taps
5.	Odour	Acceptable to consumers and no abnormal change		Consumers’ taps
6.	Sodium	200	mg/l	Consumers’ taps
7.	Taste	Acceptable to consumers and no abnormal change		Consumers’ taps
8.	Tetrachloromethane	3	µg/l	Consumers’ taps
9.	Turbidity	4	NTU	Consumers’ taps

SCHEDULE 2 — INDICATOR PARAMETERS

¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.	¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.	¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.	¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.	¹ May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.
² The water should not be aggressive.	² The water should not be aggressive.	² The water should not be aggressive.	² The water should not be aggressive.	² The water should not be aggressive.
³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration.	³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration.	³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration.	³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration.	³ Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration.
⁴ Excluding tritium, potassium-40, radon and radon decay products.	⁴ Excluding tritium, potassium-40, radon and radon decay products.	⁴ Excluding tritium, potassium-40, radon and radon decay products.	⁴ Excluding tritium, potassium-40, radon and radon decay products.	⁴ Excluding tritium, potassium-40, radon and radon decay products.
⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required.	⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required.	⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required.	⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required.	⁵ Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required.
⁶ 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.	⁶ 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.	⁶ 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.	⁶ 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.	⁶ 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.
⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.	⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.	⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.	⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.	⁷ If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.
(1) Item	(2) Parameters	(3) Specification Concentration or Value (maximum unless otherwise stated) or State	(4) Units of Measurement	(5) Point of monitoring
1	Ammonium	0.50	mg/l	Consumers' taps
2	Chloride¹²	250	mg/l	Supply point
3	Clostridium perfringens(including spores)¹	0	Number/100ml	Supply point
4	Coliform bacteria	0	Number/100ml	Consumers' taps
5	Colony counts	No abnormal change	Number/1ml at 22°C Number/1ml at 37°C	Consumers' taps, service reservoirs and treatment works
6	Conductivity¹²	2500	µS/cm at 20°C	Supply point
7	Hydrogen ion²	9.5	pH units	Consumers' taps
7	Hydrogen ion²	6.5 (minimum)	pH units	Consumers' taps
8	Radon (for radioactivity)¹³⁶	100	Bq/l	Supply point
9	Sulphate¹²	250	mg/l	Supply point
10	Indicative dose (for radioactivity)¹⁴⁶⁷	0.10	mSv	Supply point
11	Total organic carbon (TOC)¹	No abnormal change	mg/l	Supply point
12	Tritium (for radioactivity)¹⁵⁶	100	Bq/l	Supply point
13	Turbidity	1	NTU	Treatment works

SCHEDULE 3 — MONITORING PROGRAMMES

1

• (1) A monitoring programme established under Part 4 of these Regulations must—

• (a) verify that—

• (i) the measures in place to control risks to human health throughout the water supply chain (from the catchment area through abstraction, treatment and storage to distribution) are working effectively; and

• (ii) water at the point of compliance is wholesome;

• (b) provide information on the quality of water supplied to—

• (i) demonstrate whether or not the water complies with prescribed concentrations and values for parameters in Schedule 1;

• (ii) determine the organoleptic and microbiological quality of the water; and

• (iii) establish the effectiveness of the treatment of the water, particularly of disinfection where it is used.

• (c) identify the most appropriate means of mitigating any risk to human health; and

• (d) have regard to Part 5.

• (2) A monitoring programme must consist of either—

• (a) the collection and analysis of discrete water samples; or

• (b) measurement recorded by a continuous monitoring process; or

• (c) a combination of both of the methods described in sub-paragraphs (a) and (b).

• (3) In addition, monitoring programmes may consist of—

• (a) inspections of records of the functionality and maintenance status of equipment; and/or

• (b) inspections of the catchment area, water abstraction, treatment, storage and distribution infrastructure.

• (4) The monitoring programme may be based on a risk assessment as set out in regulation 30.

• (5) When choosing appropriate parameters and other micro-organisms, parasites or substances for monitoring programmes, local conditions for each water supply system must be taken into consideration.

¹ A supply which consists of both groundwater and surface water is deemed to be a supply which consists only of surface water.	¹ A supply which consists of both groundwater and surface water is deemed to be a supply which consists only of surface water.	¹ A supply which consists of both groundwater and surface water is deemed to be a supply which consists only of surface water.
(1) Item	(2) Parameter	(3) Circumstances
1	Aluminium	If used as water treatment chemicals or where the water originates from, or is influenced by, surface waters
2	Ammonium	Where chloramination is practised
3	Coliform bacteria	In all supplies
4	Colony Counts	In all supplies
5	Colour	In all supplies
6	Conductivity	In all supplies
7	Disinfectant residual	When disinfection treatment is practised
8	Escherichia coli (E. coli)	In all supplies
9	Indicative Dose	Where there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
10	Iron¹	If used as water treatment chemicals or where the water originates from, or is influenced by, surface waters
11	Manganese¹	Where the water originates from, or is influenced by, surface waters
12	Nitrate	Where chloramination is practised
13	Nitrite	Where chloramination is practised
14	Odour	In all supplies
15	pH (Hydrogen ion)	In all supplies
16	Radon	Where there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
17	Taste	In all supplies
18	Tritium	Where there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
19	Turbidity	In all supplies
¹ Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.	¹ Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.	¹ Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.
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² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (5) and (6) below.	² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (5) and (6) below.	² Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (5) and (6) below.
³ Group A monitoring in water supply zones is required only where chloramination is practised. In other circumstances Group B monitoring is required.	³ Group A monitoring in water supply zones is required only where chloramination is practised. In other circumstances Group B monitoring is required.	³ Group A monitoring in water supply zones is required only where chloramination is practised. In other circumstances Group B monitoring is required.
⁴ Group B monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, Group B monitoring is required at supply points.	⁴ Group B monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, Group B monitoring is required at supply points.	⁴ Group B monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, Group B monitoring is required at supply points.
⁵ To monitor for indicative dose (for radioactivity).	⁵ To monitor for indicative dose (for radioactivity).	⁵ To monitor for indicative dose (for radioactivity).
⁶ In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.	⁶ In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.	⁶ In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.
(1) Substances and parameters subject to monitoring	(2) Estimated population of water supply zone¹	(3) Number of samples per year
Group A monitoring	Group A monitoring	Group A monitoring
Escherichia coli (E. coli)	< 100≥ 100	412 per 5,000 population¹
Coliform bacteria	< 100≥ 100	412 per 5,000 population¹
Residual disinfectant	< 100≥ 100	412 per 5,000 population¹
Aluminium	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Ammonium	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Colony counts	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Colour	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Conductivity²	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Hydrogen ion	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Iron	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Manganese	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Nitrate³	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Nitrite³	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Odour	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Taste	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Turbidity	<100100–4,9995,000–9,99910,000–29,99930,000–49,99950,000–79,99980,000–100,000	241224365276
Group B monitoring	Group B monitoring	Group B monitoring
Aluminium	<100100–4,9995,000–100,000	148
Antimony	<100100–4,9995,000–100,000	148
Arsenic	<100100–4,9995,000–100,000	148
Benzene²	<100100–4,9995,000–100,000	148
Benzo(a)pyrene	<100100–4,9995,000–100,000	148
Boron²	<100100–4,9995,000–100,000	148
Bromate⁴	<100100–4,9995,000–100,000	148
Cadmium	<100100–4,9995,000–100,000	148
Chromium	<100100–4,9995,000–100,000	148
Clostridium perfringens (including spores)	<100100–4,9995,000–100,000	148
Copper	<100100–4,9995,000–100,000	148
Cyanide²	<100100–4,9995,000–100,000	148
1,2 dichloroethane²	<100100–4,9995,000–100,000	148
Enterococci	<100100–4,9995,000–100,000	148
Fluoride²	<100100–4,9995,000–100,000	148
Gross alpha²⁵	<100100–4,9995,000–100,000	148
Gross beta²⁵	<100100–4,9995,000–100,000	148
Iron	<100100–4,9995,000–100,000	148
Lead	<100100–4,9995,000–100,000	148
Manganese	<100100–4,9995,000–100,000	148
Mercury²	<100100–4,9995,000–100,000	148
Nickel	<100100–4,9995,000–100,000	148
Nitrate³	<100100–4,9995,000–100,000	148
Nitrite³	<100100–4,9995,000–100,000	148
Pesticides and relatedproducts²	<100100–4,9995,000–100,000	148
Polycyclic aromatic hydrocarbons	<100100–4,9995,000–100,000	148
Radon²⁶	<100100–4,9995,000–100,000	148
Selenium	<100100–4,9995,000–100,000	148
Sodium	<100100–4,9995,000–100,000	148
Trichloroethene/Tetrachloroethene²	<100100–4,9995,000–100,000	148
Tetrachloromethane²	<100100–4,9995,000–100,000	148
Trihalomethanes	<100100–4,9995,000–100,000	148
Chloride²	<100100–4,9995,000–100,000	148
Sulphate²	<100100–4,9995,000–100,000	148
Total organic carbon²	<100100–4,9995,000–100,000	148
Tritium²	<100100–4,9995,000–100,000	148
¹ The water undertaker may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita.	¹ The water undertaker may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita.	¹ The water undertaker may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita.
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² The volumes are calculated as averages taken over a calendar year.	² The volumes are calculated as averages taken over a calendar year.	² The volumes are calculated as averages taken over a calendar year.
³ Sampling at treatment works when chloramination is practised.	³ Sampling at treatment works when chloramination is practised.	³ Sampling at treatment works when chloramination is practised.
⁴ Sampling at treatment works when chloramination is not practised.	⁴ Sampling at treatment works when chloramination is not practised.	⁴ Sampling at treatment works when chloramination is not practised.
⁵ Group B monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, Group B monitoring is required in water supply zones	⁵ Group B monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, Group B monitoring is required in water supply zones	⁵ Group B monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, Group B monitoring is required in water supply zones
⁶ To monitor for indicative dose (for radioactivity).	⁶ To monitor for indicative dose (for radioactivity).	⁶ To monitor for indicative dose (for radioactivity).
(1) Item	(2) Substances and parameters	(3) Volume of water supplied m³/d¹
1	Escherichia coli (E. coli)	<2020-1,9992,000-5,9996,000-11,999≥ 12,000
2	Coliform bacteria	<2020-1,9992,000-5,9996,000-11,999≥ 12,000
3	Colony counts	<2020-1,9992,000-5,9996,000-11,999≥ 12,000
4	Nitrite³	<2020-1,9992,000-5,9996,000-11,999≥ 12,000
5	Residual disinfectant	<2020-1,9992,000-5,9996,000-11,999≥ 12,000
6	Turbidity	<2020-1,9992,000-5,9996,000-11,999≥ 12,000
Group A monitoring	Group A monitoring	Group A monitoring
7	Conductivity	<2020-9991,000-1,9992,000-5,9996,000-9,99910,000-15,99916,000-32,99933,000-49,99950,000-67,99968,000-84,99985,000-101,999102,000-119,999120,000-241,999242,000-484,999485,000-728,999
Group A monitoring	Group A monitoring	Group A monitoring
8	Gross alpha⁶	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥ 650,000
9	Gross beta⁶	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥ 650,000
10	Radon	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥ 650,000
11	Tritium	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥ 650,000
Group B monitoring	Group B monitoring	Group B monitoring
12	Benzene	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
13	Boron	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
14	Bromate⁵	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
15	Clostridium perfringens (including spores)	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
16	Cyanide	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
17	1,2,dichloroethane	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
18	Fluoride	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
19	Mercury	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
20	Nitrite⁴	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
21	Pesticides and related products	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
22	Trichloroethene/Tetrachloroethene	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
23	Tetrachloromethane	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
24	Chloride	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
25	Sulphate	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
26	Total Organic Carbon	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
27	Radon	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
28	Tritium	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
29	Gross alpha⁶	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000
30	Gross beta⁶	<2020-9991,000-49,99950,000-89,99990,000-299,999300,000-649,999≥650,000

SCHEDULE 4 — ANALYTICAL METHODOLOGY

(1) Parameter	(2) Method
Clostridium perfringens(including spores)	EN ISO 14189
Coliform bacteria	EN ISO 9308-1 or EN ISO 9308-2
Colony count 22°C-enumeration of culturable microorganisms	ENISO 6222
Colony count 36°C-enumeration of culturable microoganisms	EN ISO 6222
Enterococci	EN ISO 7899-2
Escherichia coli (E. coli)	EN ISO 9308-1 or EN ISO 9308-2
Pseudomonas aeruginosa	EN ISO 16266
¹ Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.	¹ Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.
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² Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or better. Measurement uncertainty must be estimated at the level of the parametric value, unless otherwise specified.	² Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or better. Measurement uncertainty must be estimated at the level of the parametric value, unless otherwise specified.
³ If the value of uncertainty of measurement cannot be met, the best available technique should be selected (up to 60%).	³ If the value of uncertainty of measurement cannot be met, the best available technique should be selected (up to 60%).
⁴ The method determines total cyanide in all forms.	⁴ The method determines total cyanide in all forms.
⁵ Values for trueness, precision and uncertainty of measurement are expressed in pH units.	⁵ Values for trueness, precision and uncertainty of measurement are expressed in pH units.
⁶ Reference method EN ISO 8467.	⁶ Reference method EN ISO 8467.
⁷ The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80 % may be allowed for a number of pesticides	⁷ The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80 % may be allowed for a number of pesticides
⁸ The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1.	⁸ The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1.
⁹ The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1.	⁹ The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1.
¹⁰ The uncertainty of measurement should be estimated at the level of 3 mg/l of the total organic carbon. CEN 1484 Guidelines for the determination of total organic carbon and dissolved organic carbon must be used.	¹⁰ The uncertainty of measurement should be estimated at the level of 3 mg/l of the total organic carbon. CEN 1484 Guidelines for the determination of total organic carbon and dissolved organic carbon must be used.
¹¹ The uncertainty of measurement must be estimated at the level of 1.0 NTU (nephelometric turbidity units) in accordance with EN ISO 7027.	¹¹ The uncertainty of measurement must be estimated at the level of 1.0 NTU (nephelometric turbidity units) in accordance with EN ISO 7027.
(1) Parameter¹	(2) Uncertainty of measurement (% of parametric value, except pH)²
Aluminium	25
Ammonium	40
Antimony	40
Arsenic	30
Benzo(a)pyrene³	50
Benzene	40
Boron	25
Bromate	40
Cadmium	25
Chloride	15
Chromium	30
Conductivity	20
Copper	25
Cyanide⁴	30
1,2-dichloroethane	40
Fluoride	20
Hydrogen ion concentration pH (expressed in pH units)⁵	0.2
Iron	30
Lead	25
Manganese	30
Mercury	30
Nickel	25
Nitrate	15
Nitrite	20
Oxidisability⁶	50
Pesticides⁷	30
Polycyclic aromatic hydrocarbons⁸	50
Selenium	40
Sodium	15
Sulphate	15
Tetrachloroethene⁹	30
Tetrachloromethane	30
Trichloroethene⁹	40
Trihalomethanes: total⁸	40
Total organic carbon¹⁰	30
Turbidity¹¹	30
¹ Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.	¹ Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.
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² Trueness is a measure of systematic error, i.e. the difference between the mean value of the large number of repeated measurements and the true value. Further specifications are those set out in ISO 5725.	² Trueness is a measure of systematic error, i.e. the difference between the mean value of the large number of repeated measurements and the true value. Further specifications are those set out in ISO 5725.
³ Precision is a measure of random error and is usually expressed as the standard deviation (within and between batches) of the spread of results from the mean. Acceptable precision is twice the relative standard deviation. This term is further specified in ISO 5725.	³ Precision is a measure of random error and is usually expressed as the standard deviation (within and between batches) of the spread of results from the mean. Acceptable precision is twice the relative standard deviation. This term is further specified in ISO 5725.
⁴ Limit of detection is either three times the standard deviation within a batch of a natural sample containing a low concentration of the parameter; or five times the standard deviation of a blank sample (within a batch).	⁴ Limit of detection is either three times the standard deviation within a batch of a natural sample containing a low concentration of the parameter; or five times the standard deviation of a blank sample (within a batch).
⁵ The method determines total cyanide in all forms.	⁵ The method determines total cyanide in all forms.
⁶ Values for trueness, precision and uncertainty of measurement are expressed in pH units.	⁶ Values for trueness, precision and uncertainty of measurement are expressed in pH units.
⁷ Reference method EN ISO 8467 1995.	⁷ Reference method EN ISO 8467 1995.
⁸ The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30% can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides	⁸ The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30% can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides
⁹ The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1.	⁹ The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1.
¹⁰ The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1.	¹⁰ The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1.
¹¹ The performance characteristics apply to prescribed value 4 NTU.	¹¹ The performance characteristics apply to prescribed value 4 NTU.
¹² The performance characteristics apply to prescribed value 1 NTU for water leaving surface water treatment works.	¹² The performance characteristics apply to prescribed value 1 NTU for water leaving surface water treatment works.
(1) Parameter¹	(2) Trueness²
Aluminium	10
Ammonium	10
Antimony	25
Arsenic	10
Benzene	25
Benzo(a)pyrene	25
Boron	10
Bromate	25
Cadmium	10
Chloride	10
Chromium	10
Colour	10
Conductivity	10
Copper	10
Cyanide⁵	10
1,2-dichloroethane	25
Fluoride	10
Hydrogen ion concentration pH (expressed in pH units)⁶	0.2
Iron	10
Lead	10
Manganese	10
Mercury	20
Nickel	10
Nitrate	10
Nitrite	10
Oxidisability⁷	25
Pesticides⁸	25
Polycyclic aromatic hydrocarbons⁹	25
Selenium	10
Sodium	10
Sulphate	10
Tetrachloroethene¹⁰	25
Tetrachloromethane	20
Trichloroethene¹⁰	25
Trihalomethanes: total⁹	25
Turbidity¹¹	10
Turbidity¹²	25

SCHEDULE 5 — MONITORING FOR INDIVIDUAL RADIONUCLIDES

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 . The recommended screening value for gross alpha is 0.1Bq/l and for gross beta is 1.0Bq/l.

2

Calculation of the ID

3

Performance characteristics and method of analysis.

SCHEDULE 6 — REVOCATIONS

Revocations coming into operation on the 27th October 2017

No.	Regulations revoked	Extent of revocation
1.	The Water Supply (Water Quality) Regulations (Northern Ireland) 2007	The whole Regulations
2.	The Water Supply (Water Quality) (Amendment) Regulations (NI) 2009	The whole Regulations
3.	The Water Supply (Water Quality) (Amendment) Regulations (NI) 2010	The whole Regulations
4.	The Water Supply (Water Quality) (Amendment) Regulations (NI) 2015	The whole Regulations

Signed

Sealed with the Official Seal of the Department of Agriculture, Environment and Rural Affairs on 6th October 2017

Dave Foster — A senior officer of the — Department of the Environment

Explanatory note

(This note is not part of the Regulations)

Footnotes

Revocations coming into operation on the 27th October 2017

No.	Regulations revoked	Extent of revocation
1.	The Water Supply (Water Quality) Regulations (Northern Ireland) 2007	The whole Regulations
2.	The Water Supply (Water Quality) (Amendment) Regulations (NI) 2009	The whole Regulations
3.	The Water Supply (Water Quality) (Amendment) Regulations (NI) 2010	The whole Regulations
4.	The Water Supply (Water Quality) (Amendment) Regulations (NI) 2015	The whole Regulations

Editorial notes