The Private Water Supplies (Wales) Regulations 2010 (revoked)

Regulations 4, 10, 15 and 17

SCHEDULE 1 E+W Concentrations or Values

PART 1 E+W Wholesomeness

TABLE A: MICROBIOLOGICAL PARAMETERS

Prescribed concentrations or values

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

TABLE B:CHEMICAL PARAMETERS

Prescribed concentrations or values

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 the nitrate-nitrite formula in regulation 4(c).
3 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.
4 “Pesticides total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.
5 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.
6 The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
7 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.
Parameters	Maximum concentration or value	Units of Measurement
Acrylamide 1	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 1	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 2	50	mg/l
Nitrite2	0.5 (or 0.1 in the case of treatment works)	mg/l
Pesticides 3—
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 4	0.50	μg/l
Polycyclic aromatic hydrocarbons 5	0.10	μg/l
Selenium	10	μg/l
Tetrachloroethene and Trichloroethene 6	10	μg/l
Trihalomethanes: Total 7	100	μg/l
Vinyl chloride 1	0.50	μg/l

National requirements — Prescribed concentrations or values

Parameters	Maximum concentration or value	Units of Measurement
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 E+W Indicator Parameters

TABLE C

Prescribed concentrations, values or states

1 The water should not be aggressive.
F1 . . .
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
F2 . . .	F2 . . .	F2 . . .
Total organic carbon (TOC)	No abnormal change	mgC/l
F3 . . .	F3 . . .	F3 . . .
Turbidity3	1	NTU

Textual Amendments

F1 Words in Sch. 1 Pt. 2 omitted (14.4.2016) by virtue of The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), regs. 1(1), 4(c)

F2 Words in Sch. 1 Pt. 2 omitted (14.4.2016) by virtue of The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), regs. 1(1), 4(a)

F3 Words in Sch. 1 Pt. 2 omitted (14.4.2016) by virtue of The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), regs. 1(1), 4(b)

[F4 PART 3 E+W Radioactive substances parameters

Textual Amendments

F4 Sch. 1 Pt. 3 inserted (14.4.2016) by The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), reg. 1(1), Sch. 1

TABLE D

Parametric values for radon, tritium and ID of water intended for human consumption

(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.]
Parameters	Maximum concentration or value		Units of measurement
Indicative dose (for radioactivity)	0,10		mSv
Radon	100		Bq/1
Tritium (for radioactivity)	100		Bq/l

Regulation 9

SCHEDULE 2 E+W Monitoring

PART 1 E+W Check monitoring

Sampling E+W

1.—(1) A local authority must undertake check monitoring in accordance with this Part.

(2) Check monitoring means sampling for each parameter listed in Table 1 in the circumstances listed in that table in order—

(a) to determine whether or not water complies with the concentrations or values in Schedule 1;

(b) to provide information on the organoleptic and microbiological quality of the water; and

(c) to establish the effectiveness of the treatment of the water, including disinfection.

Table 1

Check monitoring

Parameter	Circumstances
Aluminium	When used as flocculant or where the water originates from, or is influenced by, surface waters
Ammonium	In all supplies
Clostridium perfringens (including spores) waters	Where the water originates from, or is influenced by, surface
Coliform bacteria	In all supplies
Colony counts	In all supplies
Colour	In all supplies
Conductivity	In all supplies
Escherichia coli (E. coli)	In all supplies
Hydrogen ion concentration	In all supplies
Iron	When used as flocculant or where the water originates from, or is influenced by, surface waters
Manganese	Where the water originates from, or is influenced by, surface waters
Nitrate	When chloramination is practised
Nitrite	When chloramination is practised
Odour	In all supplies
Pseudomonas aeruginosa	Only in the case of water in bottles or containers
Taste	In all supplies
Turbidity	In all supplies

Frequency of sampling E+W

2.—(1) Sampling must be carried out at frequencies specified in Table 2.

Table 2

Sampling frequency for check monitoring

Volume m3/day	Sampling frequency per year
≤ 10	1
> 10 ≤ 100	2
> 100 ≤ 1,000	4
> 1,000 ≤ 2,000	10
> 2,000 ≤ 3,000	13
> 3,000 ≤ 4,000	16
> 4,000 ≤ 5,000	19
> 5,000 ≤ 6,000	22
> 6,000 ≤ 7,000	25
> 7,000 ≤ 8,000	28
> 8,000 ≤ 9,000	31
> 9,000 ≤ 10,000	34
> 10,000	4 + 3 for each 1,000 m3/day of the total volume (rounding up to the nearest multiple of 1,000 m3/day)

(2) The local authority may reduce the frequency of sampling for a parameter to a frequency not less than half if—

(a) the local authority is of the opinion that the quality of water in the supply is unlikely to deteriorate;

(b) in the case of hydrogen ion the parameter has had a pH value that is not less than 6.5 and not more than 9.5; and

(c) in all other cases, in each of two successive years the results of samples taken for the purposes of monitoring the parameter in question are constant and significantly lower than the concentrations or values laid down in Schedule 1.

(3) The local authority may set a higher frequency for any parameter if it considers it appropriate taking into account the findings of any risk assessment, and in addition may monitor anything else identified in the risk assessment.

(4) Notwithstanding the provisions in sub-paragraph (2) above, there must be a minimum of 1 sample per year.

PART 2 E+W Audit monitoring

Sampling E+W

3.—(1) A local authority must undertake audit monitoring in accordance with this Part.

(2) Audit monitoring means sampling for each parameter listed in [F5 Part 1 or 2 of] Schedule 1 (other than parameters already being sampled under check monitoring) in order to provide information necessary to determine whether or not the private supply satisfies each concentration, value or state specified in [F6 either of those Parts of] that Schedule and, if disinfection is used, to check that disinfection by-products are kept as low as possible without compromising the disinfection.

(3) The local authority may, for such time as it may decide, exclude a parameter from the audit monitoring of a private supply—

(a) if it considers that the parameter in question is unlikely to be present in the supply or system at a concentration or value that poses a risk of the private supply failing to meet the concentration, value or state specified in [F7 Part 1 or 2 of] Schedule 1 in respect of that parameter;

(b) taking into account the findings of any risk assessment; and

(c) taking into account any guidance issued by the Welsh Ministers.

(4) It may monitor anything else identified in the risk assessment.

Textual Amendments

F5 Words in Sch. 2 para. 3(2) inserted (14.4.2016) by The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), regs. 1(1), 6(a)(i)

F6 Words in Sch. 2 para. 3(2) inserted (14.4.2016) by The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), regs. 1(1), 6(a)(ii)

F7 Words in Sch. 2 para. 3(3)(a) inserted (14.4.2016) by The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), regs. 1(1), 6(b)

Frequency of sampling E+W

4.—(1) Sampling must be carried out at the frequencies specified in Table 3.

Table 3

Sampling frequency for audit monitoring

Volume m3/day	Sampling frequency per year
≤ 10	1
> 10 ≤ 3,300	2
> 3,300 ≤ 6,600	3
> 6,600 ≤ 10,000	4
> 10,000 ≤ 100,000	3 + 1 for each 10,000 m3/day of the total volume (rounding up to the nearest multiple of 10,000 m3/day)
> 100,000	10 + 1 for each 25,000 m3/day of the total volume (rounding up to the nearest multiple of 25,000 m3/day)

(2) The local authority may set a higher frequency for any parameter if it considers it appropriate taking into account the findings of any risk assessment.

PART 3 E+W 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.
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)

Regulation 10A

[F8 SCHEDULE 2A E+W Monitoring of radioactive substances

Textual Amendments

F8 Sch. 2A inserted (14.4.2016) by The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), reg. 1(1), Sch. 2

Radon E+W

1.— (1) In relation to the radon parameter in the radioactive substances parameters table, a local authority—

(a) must ensure that a representative survey is carried out in accordance with sub-paragraph (2) to determine the likelihood of a supply failing to comply with the relevant parametric concentration or value specified in the radioactive substances parameters table; and

(b) must carry out monitoring where there is reason to believe, on the basis of the results of the representative surveys or other reliable information, including any risk assessment carried out in accordance with regulation 6, that the parametric value for the radon parameter laid down in the radioactive substances parameters table might be exceeded.

(2) A representative survey must be designed in such a way—

(a) as to be capable of determining the scale and nature of likely exposure to radon in water intended for human consumption originating from different types of groundwater sources and wells in different geological areas; and

(b) that underlying parameters, especially the geology and hydrology of the area, radioactivity of rock or soil, and well type, can be identified and used to direct further action to areas of likely high exposure.

Tritium E+W

2.— (1) In relation to the tritium parameter in the radioactive substances parameters table, a local authority—

(a) must carry out monitoring where an anthropogenic source of tritium or other artificial radionuclides is present within the catchment area and it cannot be shown on the basis of other surveillance programmes or investigations, including any risk assessment carried out in accordance with regulation 6, that the level of tritium is below the parametric value listed in the radioactive substances parameters table; and

(b) must carry out an investigation of the presence of other artificial radionuclides if the concentration of tritium exceeds the parametric value listed in the radioactive substances parameters table.

(2) Where monitoring is required by sub-paragraph (1)—

(a) it must be carried out at the frequencies as set out for audit monitoring in Table 3 in Part 2 of Schedule 2; or

(b) it must (in the case of a private water supply falling within the scope of regulation 10(1)) be carried out at least every five years or more frequently if the risk assessment referred to under sub-paragraph (1)(a) shows this to be necessary.

Indicative Dose E+W

3.— (1) In relation to the indicative dose (“ID”) parameter in the radioactive substances parameters table, a local authority must carry out monitoring where a source of artificial radioactivity or elevated natural radioactivity is present and it cannot be shown on the basis of other surveillance programmes or investigations, including any risk assessment carried out in accordance with regulation 6, that the level of ID is below the parametric value listed the radioactive substances parameters table.

(2) Where monitoring is required by sub-paragraph (1) in relation to artificial radionuclides—

(a) it must be carried out at the frequencies as set out for audit monitoring in Table 3 in Part 2 of Schedule 2;

(b) it must (in the case of a private water supply falling within the scope of regulation 10(1)) be carried out at least every five years and more frequently if the risk assessment shows this to be necessary.

(3) Where monitoring is required by sub-paragraph (1) in relation to a source of elevated natural radioactivity—

(a) the local authority—

(i) may decide the frequency of monitoring in its area depending on the screening strategy adopted by the authority; and

(ii) must notify the Welsh Ministers in writing of its decision under sub-paragraph (i); and

(b) the frequency of monitoring decided under sub-paragraph (a)(i) may vary from a single check measurement to the frequencies as set out for audit monitoring in Table 3 in Part 2 of Schedule 2.

(4) Where a local authority decides under sub-paragraph (3) that a single check measurement for natural radioactivity is appropriate, the local authority must carry out a further check if any change occurs in relation to the supply which is likely to influence the concentrations of radionuclides in the supply.

Water treatment E+W

4.   Where treatment to reduce the level of radionuclides in a private water supply has been undertaken, the local authority must monitor the supply for total indicative dose, radon and tritium in accordance the provisions of this Part and the frequencies as set out for audit monitoring in Table 3 in Part 2 of Schedule 2 to verify the continued efficacy of that treatment.

Averaging E+W

5.   Where a parametric value in the radioactive substances parameters table is exceeded in relation to a particular sample taken by a local authority, the Welsh Ministers must specify, by notice in writing to the local authority, the extent of resampling necessary to ensure that the measured values are representative of an average activity concentration for a full year.]

Regulation 11

SCHEDULE 3 E+W Sampling and analysis

PART 1 E+W General

Samples: general E+W

1.—(1) The local authority must ensure that each sample is—

(d) taken by a competent person using suitable equipment;

(e) representative of the water at the sampling point at the time of sampling;

(f) not contaminated in the course of being taken;

(g) kept at such temperature and in such conditions as will secure that there is no material change in what is to be measured; and

(h) analysed without delay by a competent person using suitable equipment.

(2) It must ensure that the sample is analysed using a system of analytical quality control.

(3) The system must be subjected to checking by a person who is—

(a) not under the control of either the analyst or the local authority; and

(b) approved by the Welsh Ministers for that purpose.

Analysing samples E+W

2.—(1) The local authority must ensure that each sample is analysed in accordance with this paragraph.

(2) For each parameter specified in the first column of Table 1 in Part 2 of this Schedule the method of analysis is specified in the second column of that table.

(3) For each parameter specified in the first column of Table 2 in Part 2 of this Schedule the method is one that is capable of—

(a) measuring concentrations and values with the trueness and precision specified in the second and third columns of that table, and

(b) detecting the parameter at the limit of detection specified in the fourth column of that table.

(4) For hydrogen ion, the method of analysis must be capable of measuring a value with a trueness of 0.2 pH unit and a precision of 0.2 pH unit.

(5) The method of analysis used for odour and taste parameters must be capable of measuring values equal to the parametric value with a precision of 1 dilution number at 25°C.

(5) For these purposes—

• “limit of detection” is —

  (a)

  three times the relative within-batch standard deviation of a natural sample containing a low concentration of the parameter; or

  (b)

  five times the relative within-batch standard deviation of a blank sample;

• “precision” (the random error) is twice the standard deviation (within a batch and between batches) of the spread of results about the mean;

• “trueness” (the systematic error) is the difference between the mean value of the large number of repeated measurements and the true value.

Authorisation of alternative methods of analysis E+W

3.—(1) The Welsh Ministers may authorise a method different from that set out in paragraph 2(2) if satisfied that it is at least as reliable.

(2) An authorisation may be time-limited and may be revoked at any time.

Sampling and analysis by persons other than local authorities E+W

4.—(1) A local authority may enter into an arrangement for any person to take and analyse samples on its behalf.

(2) A local authority must not enter into an arrangement under paragraph (1) unless—

(a) it is satisfied that the task will be carried out promptly by a person competent to perform it, and

(b) it has made arrangements that ensure that any breach of these Regulations is communicated to it immediately, and any other result is communicated to it within 28 days.

PART 2 E+W Analytical methods

Table 1

Prescribed methods of analysis

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

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

Table 2

Prescribed performance characteristics for methods of analysis

Notes:
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.
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.
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.
Parameters	Trueness % of prescribed concentration or value or specification	Precision % of prescribed concentration or value or specification	Limit of detection % of prescribed concentration or value or specification
Aluminium	10	10	10
Ammonium	10	10	10
Antimony	25	25	25
Arsenic	10	10	10
Benzene	25	25	25
Benzo(a)pyrene	25	25	25
Boron	10	10	10
Bromate	25	25	25
Cadmium	10	10	10
Chloride	10	10	10
Chromium	10	10	10
Colour	10	10	10
Conductivity	10	10	10
Copper	10	10	10
Cyanide 1	10	10	10
1,2-dichloroethane	25	25	10
Fluoride	10	10	10
Iron	10	10	10
Lead	10	10	10
Manganese	10	10	10
Mercury	20	10	20
Nickel	10	10	10
Nitrate	10	10	10
Nitrite	10	10	10
Pesticides and related products 2	25	25	25
Polycyclic aromatic hydrocarbons 3	25	25	25
Selenium	10	10	10
Sodium	10	10	10
Sulphate	10	10	10
Tetrachloroethene 4	25	25	10
Tetrachloromethane	20	20	20
Trichloroethene 4	25	25	10
Trihalomethanes:
Total 3	25	25	10
Turbidity 5	10	10	10
Turbidity 6	25	25	25

[F9 PART 3 E+W Monitoring for indicative dose and analytical performance characteristics

Textual Amendments

F9 Sch. 3 Pt. 3 inserted (14.4.2016) by The Private Water Supplies (Wales) (Amendment) Regulations 2016 (S.I. 2016/411), reg. 1(1), Sch. 3

Monitoring for compliance with the indicative dose E+W

5.   A local authority may use reliable screening strategies to indicate the presence of radioactivity in water intended for human consumption.

6.   The strategies referred to in paragraph 5 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 E+W

7.   If one of the activity concentrations exceeds 20% of the corresponding derived value or the tritium concentration exceeds its parametric value listed in Part 3 of Schedule 1 an analysis of additional radionuclides is required.

8.   A local authority must, in deciding which radionuclides require to be measured for each supply, take into account all relevant information about likely sources of radioactivity.

Screening strategies for gross alpha activity and gross beta activity E+W

9.   Subject to paragraph 10 the recommended screening values are–

(a) 0,1Bq/l for gross alpha activity; and

(b) 1,0Bq/l for gross beta activity.

10.   If the gross alpha activity exceeds 0,1Bq/l or the gross beta activity exceeds 1,0Bq/l, analysis for specific radionuclides is required.

11.   The Welsh Ministers may set alternative screening levels for gross alpha activity and gross beta activity where it can be demonstrated by the local authority that the alternative levels are in compliance with an indicative dose of 0,1 mSv.

12.   The radionuclides to be measured must be based on all relevant information about likely sources of radioactivity.

Calculation of the indicative dose E+W

12.   The indicative dose must be calculated from–

(a) the measured radionuclide concentrations and the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom; or

(b) more recent information recognised by the Welsh Ministers, on the basis of the annual intake of water (730 1 for adults).

13.   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–

where:

• Ci(obs) = observed concentration of radionuclide i

• Ci(der) = derived concentration of radionuclide i

• n = number of radionuclides detected.

Derived concentrations for radioactivity in water intended for human consumption

(1) This table includes values for the most common natural and artificial radionuclides; these are precise values, calculated for a dose of 0,1 mSv, an annual intake of 730 litre and using the dose coefficients laid down in Annex III, Table A of Directive 96/29/ Euratom; derived concentrations for other radionuclides can be calculated on the same basis, and values can be updated on the basis of more recent information recognised by the Welsh Ministers.
(2) This table allows only for the radiological properties of uranium, not for its chemical toxicity.
Origin	Nuclide	Derived concentration
Natural	U-238	3,0 Bq/1
	U-234	2,8 Bq/1
	Ra-226	0,5 Bq/1
	Ra-228	0,2 Bq/1
	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

Performance characteristics and methods of analysis E+W

14.   For the following parameters and radionuclides, the method of analysis used must, as a minimum, be capable of measuring activity concentrations with a limit of detection specified below:

(Note 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.
(Note 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.
(Note 3) The limit of detection for tritium and for radon is 10% of its parametric value of 100 Bq/1.
(Note 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.
(Note 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
Tritium	10 Bq/1
Radon	10 Bq/1
gross alpha	0,04 Bq/1
gross beta	0,4 Bq/1
U-238	0,02 Bq/1
U-234	0,02 Bq/1
Ra-226	0,04 Bq/1
Ra-228	0,02 Bq/1
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

Regulations 12 and 13

SCHEDULE 4 E+W Records

Initial records E+W

1.—(1) A local authority must, before [   ], record the number of private supplies in its area, and for each supply must record—

(a) the name of the supply, together with a unique identifier;

(b) the type of source;

(c) the geographical location using a grid reference;

(d) an estimate of the number of people supplied;

(e) an estimate of the average daily volume of water supplied in cubic metres;

(f) the type of premises supplied;

(g) detail of any treatment process, together with its location;

F10 (h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(2) It must review and update the record at least once a year.

(3) It must keep the record for at least 30 years.

Textual Amendments

F10 Sch. 4 para. 1(1)(h) omitted (1.4.2013) by virtue of The National Treatment Agency (Abolition) and the Health and Social Care Act 2012 (Consequential, Transitional and Saving Provisions) Order 2013 (S.I. 2013/235), art. 1(2), Sch. 2 para. 142(3)

Additional records E+W

2.—(1) For each supply it must record, within 28 days of each of the following taking place—

(a) a plan and description of the supply;

(b) the monitoring programme for the supply;

(c) the risk assessment;

(d) the date, results and location of any sampling and analysis relating to that supply, and the reason for taking the sample;

(e) the results of any investigation undertaken in accordance with these Regulations;

(f) any authorisation;

(g) any notices served under section 80 of the Water Industry Act 1991, or regulation 18;

(h) any action agreed to be taken by any person under these Regulations;

(i) any request for the local authority to carry out sampling and analysis, undertake a risk assessment or give advice;

(j) a summary of any advice given in relation to the supply.

(2) It must keep the risk assessment and records of sampling and analysis for at least thirty years, and all other records under this paragraph for at least five years.

Regulation 21

SCHEDULE 5 E+W Fees

Fee E+W

1.  The local authority may charge a fee, payable on invoice, for the activities in the following table, and the fee is the reasonable cost of providing the service subject to the following maximum amounts.

1 No fee is payable where a sample is taken and analysed solely to confirm or clarify the results of the analysis of a previous sample.
Service	Maximum fee (£)
Risk assessment (each assessment):	500
Sampling (each visit) 1:	100
Investigation (each investigation):	100
Granting an authorisation (each authorisation):	100
Analysing a sample—
taken under regulation 10:	25
taken during check monitoring:	100
taken during audit monitoring:	500

Persons liable to pay E+W

2.—(1) Any person requesting anything under these Regulations is liable for the cost.

(2) Otherwise fees are payable, as specified in the invoice, by the relevant person as defined in section 80(7) of the Water Industry Act 1991.

(3) Where more than one person is liable, in determining who is required to make payment the local authority—

(a) may apportion the charge between them; and

(b) must have regard to any agreement or other document produced to the local authority relating to the terms on which water is supplied.