The Private Water Supplies (Wales) Regulations 2010

Made: 13 January 2010

Laid before the National Assembly for Wales: 14 January 2010

Coming into force: 4 February 2010

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PART 1 — Water standards

Title, application and commencement

1

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Scope

2

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Exemptions

3

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Wholesomeness

4

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Disinfection

5

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Requirement to carry out a risk assessment

6

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PART 2 — Monitoring

Monitoring

7

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Further distribution of supplies from water undertakers or water supply licensees

8

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Large supplies and supplies to commercial or public premises

9

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Other private supplies

10

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Sampling and analysis

11

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Maintenance of records

12

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Notification of information

13

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PART 3 — Action in the event of failure

Provision of information

14

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Investigation

15

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Procedure following investigation

16

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Authorisations of different standards

17

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PART 4 — Notice procedure

Notices

18

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Appeals

19

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Penalties

20

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PART 5 — Miscellaneous

Fees

21

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Revocation

22

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SCHEDULE 1 — Concentrations or Values

PART 1 — Wholesomeness

Parameters	Maximum concentration or value	Units of Measurement
Escherichia coli (E. coli)	0	Number/100ml
Enterococci	0	Number/100ml
In the case of water in bottles or containers:
Escherichia coli (E.coli)	0	Number/250ml
Enterococci	0	Number/250ml
Pseudomonas aeruginosa	0	Number/250ml
Colony count 22°C	100	Number/ml
Colony count 37°C	20	Number/ml
Parameters	Maximum concentration or value	Units of Measurement
---	---	---
(i) 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.	(i) 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.	(i) 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.
(ii) See also the nitrate-nitrite formula in regulation 4(c).	(ii) See also the nitrate-nitrite formula in regulation 4(c).	(ii) See also the nitrate-nitrite formula in regulation 4(c).
(iii) For these purposes “Pesticides” means: organic insecticides organic herbicides organic fungicides organic nematocides organic acaricides organic algicides organic rodenticides organic slimicides related products (inter alia, growth regulators) and their relevant metabolites, degradation and reaction products. Only those pesticides likely to be present in a given supply need be monitored.	(iii) For these purposes “Pesticides” means: organic insecticides organic herbicides organic fungicides organic nematocides organic acaricides organic algicides organic rodenticides organic slimicides related products (inter alia, growth regulators) and their relevant metabolites, degradation and reaction products. Only those pesticides likely to be present in a given supply need be monitored.	(iii) For these purposes “Pesticides” means: organic insecticides organic herbicides organic fungicides organic nematocides organic acaricides organic algicides organic rodenticides organic slimicides related products (inter alia, growth regulators) and their relevant metabolites, degradation and reaction products. Only those pesticides likely to be present in a given supply need be monitored.
(iv) “Pesticides total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.	(iv) “Pesticides total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.	(iv) “Pesticides total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.
(v) The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(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.	(v) The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(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.	(v) The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(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.
(vi) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(vi) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(vi) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(vii) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(vii) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.	(vii) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
Acrylamide [^f01000]	0.10	μg/l
Antimony	5.0	μg/l
Arsenic	10	μg/l
Benzene	1.0	μg/l
Benzo(a)pyrene	0.010	μg/l
Boron	1.0	mg/l
Bromate	10	μg/l
Cadmium	5.0	μg/l
Chromium	50	μg/l
Copper	2.0	mg/l
Cyanide	50	μg/l
1, 2 dichloroethane	3.0	μg/l
Epichlorohydrin [^f01000]	0.10	μg/l
Fluoride	1.5	mg/l
Lead	25 (until 25th December 2013)	μg/l
	10 (from 25th December 2013)	μg/l
Mercury	1.0	μg/l
Nickel	20	μg/l
Nitrate [^f01001]	50	mg/l
Nitrite[^f01001]	0.5 (or 0.1 in the case of treatment works)	mg/l
Pesticides [^f01002]—
Aldrin	0.030	μg/l
Dieldrin	0.030	μg/l
Heptachlor	0.030	μg/l
Heptachlor epoxide	0.030	μg/l
Other pesticides	0.10	μg/l
Pesticides total [^f01003]	0.50	μg/l
Polycyclic aromatic hydrocarbons [^f01004]	0.10	μg/l
Selenium	10	μg/l
Tetrachloroethene and Trichloroethene [^f01005]	10	μg/l
Trihalomethanes: Total [^f01006]	100	μg/l
Vinyl chloride [^f01000]	0.50	μg/l
Parameters	Maximum concentration or value	Units of Measurement
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Aluminium	200	μg/l
Colour	20	mg/l Pt/Co
Iron	200	μg/l
Manganese	50	μg/l
Odour	Acceptable to consumers and no abnormal change
Sodium	200	mg/l
Taste	Acceptable to consumers and no abnormal change
Tetrachloromethane	3	μg/l
Turbidity	4	NTU

PART 2 — Indicator Parameters

¹ The water should not be aggressive.	¹ The water should not be aggressive.	¹ The water should not be aggressive.
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³ Only in the case of surface water or groundwater that has been influenced by surface water.	³ Only in the case of surface water or groundwater that has been influenced by surface water.	³ Only in the case of surface water or groundwater that has been influenced by surface water.
Parameters	Maximum concentration or value or state (unless otherwise stated)	Units of measurement
Ammonium	0.50	mg/l
Chloride ¹	250	mg/l
Clostridium perfringens	0	Number/100ml
(including spores)
Coliform bacteria	0	Number/100ml (Number/250ml in the case of water put into bottles or containers)
Colony counts	No abnormal change	Number/ml at 22°C
	No abnormal change	Number/ml at 37°C
Conductivity ¹	2500	μS/cm at 20°C
Hydrogen ion	9.5 (maximum)	pH value
	6.5 (minimum) (in the case of still water put into bottles or containers the minimum is 4.5)	pH value
Sulphate ¹	250	mg/l
. . .	. . .	. . .
Total organic carbon (TOC)	No abnormal change	mgC/l
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Turbidity³	1	NTU

SCHEDULE 2 — Monitoring

PART 1 — Check monitoring

Sampling

1

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Frequency of sampling

2

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PART 2 — Audit monitoring

Sampling

3

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Frequency of sampling

4

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PART 3 — Minimum frequency for both check monitoring and audit monitoring for water put into bottles or containers

¹ The volumes are calculated as averages taken over a calendar year.	¹ The volumes are calculated as averages taken over a calendar year.	¹ The volumes are calculated as averages taken over a calendar year.
Volume¹ of water produced in bottles or containers each day (m³)	Check monitoring number of samples per year	Audit monitoring number of samples per year
≤ 10	1	1
>10≤60	12	1
> 60	1 for each 5 m³/day of the total volume (rounding up to the nearest multiple of 5 m³/day)	1 for each 100 m³/day of the total volume (rounding up to the nearest multiple of 100 m³/day)

SCHEDULE 3 — Sampling and analysis

PART 1 — General

Samples: general

1

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Analysing samples

2

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Authorisation of alternative methods of analysis

3

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Sampling and analysis by persons other than local authorities

4

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PART 2 — Analytical methods

Parameter	Method
Clostridium perfringens (including spores)	Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar* at 44 ± 1°C for 21 ± 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds.
Coliform bacteria	BS-EN ISO 9308-1
Colony count 22°C — enumeration of culturable microorganisms	BS-EN ISO 6222
Colony count 37°C — enumeration of culturable microorganisms	BS-EN ISO 6222
Enterococci BS-EN ISO 7899-2
Escherichia coli (E. coli)	BS-EN ISO 9308-1
Pseudomonas aeruginosa	BS-EN-ISO 12780
Parameters	Trueness % of prescribed concentration or value or specification
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Notes:	Notes:
(i) The method of analysis should determine total cyanide in all forms.	(i) The method of analysis should determine total cyanide in all forms.
(ii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.	(ii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.
(iii) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.	(iii) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.
(iv) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.	(iv) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.
(v) The performance characteristics apply to the prescribed value of 4 NTU.	(v) The performance characteristics apply to the prescribed value of 4 NTU.
(vi) The performance characteristics apply to the specification of 1 NTU for surface waters or ground waters influenced by surface water.	(vi) The performance characteristics apply to the specification of 1 NTU for surface waters or ground waters influenced by surface water.
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
Cyanide [^f01011]	10
1,2-dichloroethane	25
Fluoride	10
Iron	10
Lead	10
Manganese	10
Mercury	20
Nickel	10
Nitrate	10
Nitrite	10
Pesticides and related products [^f01012]	25
Polycyclic aromatic hydrocarbons [^f01013]	25
Selenium	10
Sodium	10
Sulphate	10
Tetrachloroethene [^f01014]	25
Tetrachloromethane	20
Trichloroethene [^f01014]	25
Trihalomethanes:
Total [^f01013]	25
Turbidity [^f01015]	10
Turbidity [^f01016]	25

SCHEDULE 4 — Records

Initial records

1

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Additional records

2

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SCHEDULE 5 — Fees

Fee

1

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Persons liable to pay

2

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Signed

Jane Davidson — Minister for Environment, Sustainability and Housing, one of the Welsh Ministers — 2010-01-13

Explanatory note

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Footnotes

[^f00001]: S.I. 2004/3328, as amended by S.I. 2005/850, S.I. 2007/1349 and S.I. 2008/301. The functions conferred on the National Assembly for Wales by means of that Order are now exercisable by the Welsh Ministers by virtue of section 162 of, and paragraph 30 of Schedule 11 to, the Government of Wales Act 2006 (c. 32).

[^f00002]: 1972 c. 68.

[^f00003]: OJ No. L31, 1.2.2002, p. 1.

[^f00004]: 1991 c. 56. The functions of the Secretary of State under section 67 were transferred to the National Assembly for Wales (“the Assembly”) — (a) for the making of regulations concerning water supplied using the supply system of a water undertaker, in relation to the supply system of any water undertaker whose area is wholly or mainly in Wales and (b) for the making of regulations concerning water supplied other than using the supply system of a water undertaker, in relation to Wales, by article 2 of, and Schedule 1, to the National Assembly for Wales (Transfer of Functions) Order 1999 (S.I. 1999/672)(“the Order”); the functions of the Secretary of State under section 77 of that Act were transferred to the Assembly in relation to Wales by the same provisions of the Order; the functions of the Secretary of State under section 213 of that Act were exercisable by the Assembly to the same extent as the powers to which that section applies were made exercisable by the Assembly by virtue of the same provision of the Order: see the entry in Schedule 1 to the Order for the Water Industry Act 1991 as substituted by paragraph (e) of Schedule 3 to the National Assembly for Wales (Transfer of Functions) Order 2000 (S.I. 2000/253) and amended by section 100(2) of the Water Act 2003 (c. 37); there are other amending instruments but none are relevant. Section 213 of that Act was amended by sections 58 and 101(1) of, paragraph 39 of Schedule 7 to, and paragraphs 2, 19 and 49 of Schedule 8 to, the Water Act 2003. References in Schedule 1 to the Order to specific sections of the Water Industry Act 1991 are treated by section 100(6) of the Water Act 2003 as referring to those sections as amended by the Water Act 2003. See section 219(4A) of the Water Industry Act 1991 as inserted by section 101(1) of, and paragraphs 2 and 50 of Schedule 8 to, the Water Act 2003 for the definition of “supply system”. See section 219(1) of Water Industry Act 1991 as amended by section 101(1) of the Water Act 2003 for the definition of “licensed water supplier”. By virtue of section 162 of, and paragraph 30 of Schedule 11 to, the Government of Wales Act 2006 (c. 32), the functions conferred on the Assembly are now exercisable by the Welsh Ministers.

[^f00005]: S.I. 2007/3165 (W.276) as amended by S.I. 2009/1897 (W.170).

[^f00006]: 1968 c. 67.

[^f00007]: 1991 c. 56.

[^f00008]: 1991 c. 56.

[^f00009]: 1991 c. 56.

[^f00010]: 1991 c. 56.

[^f00011]: 1980 c. 43; sections 51 and 52 have been substituted by the Courts Act 2003 (c. 39), section 47.

[^f00012]: S.I. 1991/2790.

Use the following method to make m-CP agar :

Make a basal medium consisting of—

Tryptose	30.0g
Yeast extract	20.0g
Sucrose	5.0g
L-cysteine hydrochloride	1.0g
MgSO₄.7H₂O	0.1g
Bromocresol purple	40.0mg
Agar	15.0g
Water	1,000.0ml

Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for 15 minutes. Allow the medium to cool.

Dissolve—

D-cycloserine	400.0mg
Polymyxine-B sulphate	25.0mg
Indoxyl-β-D-glucoside	60.0mg

into 8ml sterile water and add it to the medium.

Add to the medium—

Filter-sterilised 0.5% phenolphthalein diphosphate solution	20.0ml
Filter-sterilised 4.5% FeCl₃.6H₂O	2.0ml
Notes:	Notes:
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¹ The method of analysis should determine total cyanide in all forms.	¹ The method of analysis should determine total cyanide in all forms.
² The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.	² The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.
³ The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.	³ The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.
⁴ The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.	⁴ The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.
⁵ The performance characteristics apply to the prescribed value of 4 NTU.	⁵ The performance characteristics apply to the prescribed value of 4 NTU.
⁶ The performance characteristics apply to the specification of 1 NTU for surface waters or ground waters influenced by surface water.	⁶ The performance characteristics apply to the specification of 1 NTU for surface waters or ground waters influenced by surface water.
Parameters	Trueness % of prescribed concentration or value or specification
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
Cyanide ¹	10
1,2-dichloroethane	25
Fluoride	10
Iron	10
Lead	10
Manganese	10
Mercury	20
Nickel	10
Nitrate	10
Nitrite	10
Pesticides and related products ²	25
Polycyclic aromatic hydrocarbons ³	25
Selenium	10
Sodium	10
Sulphate	10
Tetrachloroethene ⁴	25
Tetrachloromethane	20
Trichloroethene ⁴	25
Trihalomethanes:
Total ³	25
Turbidity ⁵	10
Turbidity ⁶	25

Editorial notes

[^key-3185f2cc28370655e6d02d779d6515ba]: Regulations revoked (20.11.2017) by The Private Water Supplies (Wales) Regulations 2017 (S.I. 2017/1041), regs. 1, 24(1)(a) (with regs. 3, 26(1)-(3))

Monitoring of radioactive substances: general

10A

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Monitoring of radioactive substances: supplies to a single dwelling not used for a commercial or public activity

10B

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Sampling and analysis

Maintenance of records

Notification of information

PART 3 — Radioactive substances parameters

(i)Enforcement action by the local authority is deemed justified on radiological protection grounds without further consideration where radon concentrations exceed 1,000 Bq/1.	(i)Enforcement action by the local authority is deemed justified on radiological protection grounds without further consideration where radon concentrations exceed 1,000 Bq/1.	(i)Enforcement action by the local authority is deemed justified on radiological protection grounds without further consideration where radon concentrations exceed 1,000 Bq/1.	(i)Enforcement action by the local authority is deemed justified on radiological protection grounds without further consideration where radon concentrations exceed 1,000 Bq/1.
(ii)If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides must be carried out.	(ii)If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides must be carried out.	(ii)If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides must be carried out.	(ii)If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides must be carried out.
Parameters	Maximum concentration or value	Maximum concentration or value	Units of measurement
Indicative dose (for radioactivity)	0,10	0,10	mSv
Radon	100	100	Bq/1
Tritium (for radioactivity)	100	100	Bq/l

SCHEDULE 2A — Monitoring of radioactive substances

Radon

1

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Tritium

2

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Indicative Dose

3

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Water treatment

4

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Averaging

5

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PART 3 — Monitoring for indicative dose and analytical performance characteristics

Monitoring for compliance with the indicative dose

5

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6

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Screening for certain radionuclides, or screening for an individual radionuclide

7

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8

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Screening strategies for gross alpha activity and gross beta activity

9

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10

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11

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12

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Calculation of the indicative dose

12

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13

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Performance characteristics and methods of analysis

14

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