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There are currently no known outstanding effects for the The Water Supply (Water Quality) Regulations 2018.
Revised legislation carried on this site may not be fully up to date. At the current time any known changes or effects made by subsequent legislation have been applied to the text of the legislation you are viewing by the editorial team. Please see ‘Frequently Asked Questions’ for details regarding the timescales for which new effects are identified and recorded on this site.
Regulations 2, 4, 6, 14, 15, 18, 20 and 22
1 Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | ||||
Part 1: Directive requirements | ||||
---|---|---|---|---|
Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
1 | Enterococci | 0 | number/100 ml | Consumers' taps |
2 | E.coli | 0 | number/100 ml | Consumers' taps |
Part 2: National requirements | ||||
1 | Coliform bacteria | 0 | number/100 ml | Service reservoirs 1 and water treatment works |
2 | E. coli | 0 | number/100 ml | Service reservoirs and water treatment works |
Note: |
1 The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | ||||
2 See also regulation 4(2)(d). | ||||
3 See the definition of “pesticides and related products” in regulation 2. | ||||
4 The parametric value applies to each individual pesticide. | ||||
5 “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | ||||
6 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. | ||||
7 The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ||||
8 The specified compounds are: 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. | ||||
Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
---|---|---|---|---|
1 | Acrylamide | 0.10 | μg/l | 1 |
2 | Antimony | 5.0 | μgSb/l | Consumers' taps |
3 | Arsenic | 10 | μgAs/l | Consumers' taps |
4 | Benzene | 1.0 | μg/l | Consumers' taps |
5 | Benzo(a)pyrene | 0.010 | μg/l | Consumers' taps |
6 | Boron | 1.0 | mgB/l | Consumers' taps |
7 | Bromate | 10 | μBrO3/l | Consumers' taps |
8 | Cadmium | 5.0 | μgCd/l | Consumers' taps |
9 | Chromium | 50 | μgCr/l | Consumers' taps |
10 | Copper | 2.0 | mgCu/l | Consumers' taps |
11 | Cyanide | 50 | μgCN/l | Consumers' taps |
12 | 1, 2 dichloroethane | 3.0 | μg/l | Consumers' taps |
13 | Epichlorohydrin | 0.10 | μg/l | 1 |
14 | Fluoride | 1.5 | mgF/l | Consumers' taps |
15 | Lead | 10 | μgPb/l | Consumers' taps |
16 | Mercury | 1.0 | μgPb/l | Consumers' taps |
17 | Nickel | 20 | μgNi/l | Consumers' taps |
18 | Nitrate 2 | 50 | mgNO3/l | Consumers' taps |
19 | Nitrite 2 | 0.50 | mgNO2/l | Consumers' taps |
0.10 | Treatment Works | |||
20 | Pesticides 3,4 | |||
Aldrin | 0.030 | μg/l | Consumers' taps | |
Dieldrin | ||||
Heptachlor | ||||
Heptachlor | ||||
epoxide | ||||
other pesticides | 0.10 | μg/l | Consumers' taps | |
21 | Pesticides: Total 5 | 0.50 | μg/l | Consumers' taps |
22 | Polycyclic aromatic hydrocarbons 6 | 0.10 | μg/l | Consumers' taps |
23 | Selenium | 10 | μgSe/l | Consumers' taps |
24 | Tetrachloroethene and Trichloroethene 7 | 10 | μg/l | Consumers' taps |
25 | Trihalomethanes: Total 8 | 100 | μg/l | Consumers' taps |
26 | Vinyl chloride | 0.50 | μg/l | 1 |
Notes: |
Item | Parameters | Concentration or Value (maximum unless otherwise stated) | Units of Measurement | Point of compliance |
1 | Aluminium | 200 | μgAl/l | Consumers' taps |
2 | Colour | 20 | mg/l Pt/Co | Consumers' taps |
3 | Iron | 200 | μgFe/l | Consumers' taps |
4 | Manganese | 50 | μgMn/l | Consumers' taps |
5 | Odour | Acceptable to consumers and no abnormal change | Consumers' taps | |
6 | Sodium | 200 | mgNa/l | Consumers' taps |
7 | Taste | Acceptable to consumers and no abnormal change | … | Consumers' taps |
8 | Tetrachlorome-thane | 3 | μg/l | Consumers' taps |
9 | Turbidity | 4 | NTU | Consumers' taps |
Regulations 2, 6, 12, 15 and 19
1 The water should not be aggressive. | ||||
2 Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment. | ||||
3 Remedial action may be taken by the Welsh Ministers on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1. | ||||
4 If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required. | ||||
5 May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | ||||
Item Parameters | Specification | Concentration or Value (maximum unless otherwise stated) or State | Units of Measurement | Point of compliance |
1 | Ammonium | 0.50 | μgAl/l | Consumers' taps |
2 | Chloride 1 | 250 | mgCl/l | Supply point 5 |
3 | Clostridium perfringens (including spores) | 0 | Number/100 ml | Supply point 5 |
4 | Coliform bacteria | 0 | Number/100 ml | Consumers' taps |
5 | Colony counts | No abnormal change | Number/1 ml at 22°C | Consumers' taps, service reservoirs and treatment works |
6 | Conductivity 1 | 2500 | μS/cm at 20°C | Supply point 5 |
7 | Hydrogen ion | 9.5 | pHvalue | Consumers' taps |
6.5 (minimum) | ||||
8 | Indicative dose 2 | 0.10 | mSv | Supply point 5 |
(a) gross alpha | 0.1 | Bq/l | Supply point 5 | |
(b) gross beta | 1 | Bq/l | Supply point 5 | |
9 | Radon 3 | 100 | Bq/l | Supply point |
10 | Sulphate 1 | 250 | mgSO4/l | Supply point 5 |
11 | Total organic carbon (TOC) | No abnormal change | mgC/l | Supply point |
12 | Tritium (for radioactivity) 4 | 100 | Bq/l | Supply point |
13 | Turbidity | 1 | NTU | Treatment works |
Notes: |
Regulations 2, 6, 8 and 9
1 Sampling for this parameter in water supply zones may be substituted by sampling at supply points. | ||
Item number (1) | Parameter (2) | Circumstances (3) |
---|---|---|
1 | Aluminium | Where used as a water treatment chemical or where the water originates from, or is influenced by, surface waters |
2 | Ammonium | Where chloramination is practised |
3 | Coliform bacteria | In all circumstances |
4 | Colony counts 22 ° C | In all circumstances |
5 | Colour | In all circumstances |
6 | Conductivity1 | In all circumstances |
7 | E. coli | In all circumstances |
8 | Hydrogen ion | In all circumstances |
9 | Iron | Where used as a water treatment chemical or where the water originates from, or is influenced by, surface waters |
10 | Manganese | Where the water originates from, or is influenced by, surface waters |
11 | Nitrate | Where chloramination is practised |
12 | Nitrite | Where chloramination is practised |
13 | Odour | In all circumstances |
14 | Residual disinfectant | In all circumstances |
15 | Taste | In all circumstances |
16 | Turbidity | In all circumstances |
Note: |
1 Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2). | ||
2 Monitoring of this parameter in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, monitoring is required at supply points, see Group B2. | ||
3 To monitor for indicative dose. | ||
4 In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. | ||
Item number | Parameter (2) | Circumstances |
---|---|---|
1 | Aluminium | Where— (i) not used as a water treatment chemical; or (ii) the water neither originates from, nor is influenced by, surface waters. |
2 | Ammonium | Where chloramination is not practised |
3 | Antimony | In all circumstances |
4 | Arsenic | In all circumstances |
5 | Benzene 1 | In all circumstances |
6 | Benzo(a)pyrene | In all circumstances |
7 | Boron 1 | In all circumstances |
8 | Bromate 2 | In all circumstances |
9 | Cadmium | In all circumstances |
10 | Chloride 1 | In all circumstances |
11 | Chromium | In all circumstances |
12 | Clostridium perfringens (including spores) | In all circumstances |
13 | Copper | In all circumstances |
14 | Cyanide 1 | In all circumstances |
15 | 1, 2 dichloroethane 1 | In all circumstances |
16 | Enterococci | In all circumstances |
17 | Fluoride 1 | In all circumstances |
18 | Gross alpha 134 | In all circumstances |
19 | Gross beta 134 | In all circumstances |
20 | Iron | Where— (i) not used as a flocculant; or (ii) the water neither originates from, nor is influenced by, surface waters. |
21 | Lead | In all circumstances |
22 | Manganese | Where the water neither originates from, nor is influenced by, surface waters. |
23 | Mercury 1 | In all circumstances |
24 | Nickel | In all circumstances |
25 | Nitrate | Where chloramination is not practised. |
26 | Nitrite | Where chloramination is not practised. |
27 | Pesticides and related products 1 | In all circumstances |
28 | Polycyclic aromatic hydrocarbon | In all circumstances |
29 | Radon 14 | In all circumstances |
30 | Selenium | In all circumstances |
31 | Sodium | In all circumstances |
32 | Sulphate 1 | In all circumstances |
33 | Tetrachloroethene 1 | In all circumstances |
34 | Tetrachloromethane 1 | In all circumstances |
Total organic carbon 1 | ||
35 | Trichloroethene | In all circumstances |
Trihalomethanes: Total | ||
36 | Tritium 14 | In all circumstances |
Notes: |
1 Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2). | ||
2 Monitoring is required at supply points where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, see Group B1. | ||
3 To monitor for indicative dose. | ||
4 In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply. | ||
Item number | Parameter 2 | Circumstances |
---|---|---|
1 | Benzene 1 | In all circumstances |
2 | Boron 1 | In all circumstances |
3 | Bromate 2 | In all circumstances |
4 | Chloride 1 | In all circumstances |
5 | [F2Colstridium perfringens (including spores)(1)] | In all circumstances |
6 | Cyanide 1 | In all circumstances |
7 | 1, 2 dichloroethane 1 | In all circumstances |
8 | Fluoride 1 | In all circumstances |
9 | Gross alpha 134 | In all circumstances |
10 | Gross beta 134 | In all circumstances |
11 | [F3Indicative dose (1)] | In all circumstances |
12 | Mercury 1 | In all circumstances |
13 | Nitrite | When chloramination is not practised. |
14 | Pesticides and related products 1 | In all circumstances |
15 | Radon 14 | In all circumstances |
16 | Sulphate 1 | In all circumstances |
17 | [F4Tetrachloroethene/Trichloroethene(1)] | In all circumstances |
18 | Tetrachloromethane 1 | In all circumstances |
19 | Total organic carbon 1 | |
20 | F5. . . | F5. . . |
21 | Tritium 14 | In all circumstances |
Notes: |
Textual Amendments
F1Words in Sch. 3 Pt. 1 Table 3 heading substituted (28.3.2019) by The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(a)
F2Words in Sch. 3 Pt. 1 Table 3 substituted (28.3.2019) by The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(b)
F3Words in Sch. 3 Pt. 1 Table 3 substituted (28.3.2019) by The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(c)
F4Words in Sch. 3 Pt. 1 Table 3 substituted (28.3.2019) by The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(d)
F5Words in Sch. 3 Pt. 1 Table 3 omitted (28.3.2019) by virtue of The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(e)
Item number | Parameter |
---|---|
1 | Coliform bacteria |
2 | E. coli |
3 | Residual disinfectant |
Item number | Parameter |
---|---|
1 | Coliform bacteria |
2 | Colony counts 22° C |
3 | E.coli |
4 | Nitrite |
5 | Residual disinfectant |
6 | Turbidity |
Item number | Parameter |
---|---|
1 | Conductivity |
Item number | Parameter |
---|---|
1 | Aluminium |
2 | Ammonium |
3 | Colony counts 22° C |
4 | Colour |
5 | Conductivity |
6 | Hydrogen ion |
7 | Iron |
8 | Manganese |
9 | Nitrate |
10 | Nitrite |
11 | Odour |
12 | Taste |
13 | Turbidity |
Table 8
Annual sampling frequencies for Group A4 parameters: water supply zones
Note:
This table and each table which follows it in this Part set out the annual sampling frequencies for all the substances and parameters comprising each of the groups to which they correspond, those groups having been outlined in Part 1 of this Schedule. These are determined for each water supply zone according to its estimated population (as specified in column one of each table in this Part). The number of samples to be taken is the standard number specified in column 2, unless a notice varying this number has been given under regulation 9.
Estimated population of water supply zone | Standard sampling frequency per year |
---|---|
<100 | 2 |
100-4,999 | 4 |
5,000—9,999 | 12 |
10,000-29,999 | 24 |
30,000-49,999 | 36 |
50,000-79,999 | 52 |
80,000-100,000 | 76 |
Estimated population of water supply zone | Standard sampling frequency per year |
---|---|
<100 | 1 |
100-4,999 | 4 |
5,000-100,000 | 8 |
Estimated population of water supply zone | Standard sampling frequency per year |
---|---|
<100 | 4 |
≥100 | 12 per 5,000 population |
Note:
For the purposes of this Table, where the population is not an exact multiple of 5,000, the population figure must be rounded up to the nearest multiple of 5,000.
Table 11
Annual sampling frequencies for Group A2 parameters: treatment works or supply points
Note: This table and each table which follows it in this Part set out the annual sampling frequencies for all the substances and parameters comprising each of the groups to which they correspond at treatment works or supply points, those groups having been outlined in Part 1 of this Schedule. The frequencies are determined according to the volume of water supplied at each treatment works or supply point. The number of samples to be taken is the standard number specified in column 2, unless a notice varying this number has been issued under regulation 9.
Volume of water supplied m 3/day | Standard sampling frequency per year |
---|---|
<20 | 4 |
20-1,999 | 52 |
2,000-5,999 | 104 |
6,000-11,999 | 208 |
≥12,000 | 365 |
Volume of water supplied m 3/day | Standard sampling frequency per year |
---|---|
<20 | 2 |
20-999 | 4 |
1,000-1999 | 12 |
2,000-5,999 | 24 |
6,000-9,999 | 36 |
10,000-15,999 | 52 |
16,000-32,999 | 104 |
33,000-49,999 | 156 |
50,000-67,999 | 208 |
68,000-84,999 | 260 |
85,000-101,999 | 312 |
102,000-119,999 | 365 |
120,000-241,999 | 730 |
242,000-484,999 | 1,460 |
485,000-728,999 | 2,190 |
Volume of water supplied m 3/day | Standard sampling frequency per year |
---|---|
<20 | 1 |
20-999 | 4 |
1,000-49,999 | 8 |
50,000-89,999 | 12 |
90,000-299,999 | 24 |
300,000-649,999 | 36 |
≥650,000 | 48 |
Regulation 6
1.—(1) A water undertaker may use reliable screening strategies to indicate the presence of radioactivity in water intended for human consumption.
(2) The strategies may include screening for–
(a)certain radionuclides or individual radionuclide; or
(b)gross alpha activity or gross beta activity (where appropriate gross beta activity may be replaced by residual beta activity after subtraction of the K-40 activity concentration).
2.—(1) If one of the activity concentrations exceeds 20% of the corresponding derived value or the tritium concentration exceeds its parametric value listed in Schedule 2 an analysis of additional radionuclides is required.
(2) In deciding which radionuclides are required to be measured for each supply, a water undertaker must take into account all relevant information about likely sources of radioactivity.
3.—(1) A water undertaker may use a screening strategy for gross alpha and gross beta to monitor for the parametric indicator value for indicative dose.
(2) Subject to sub-paragraph (3) the recommended screening values are—
(a)0,1Bq/l for gross alpha activity; and
(b)1,0Bq/l for gross beta activity M1.
(3) If the gross alpha activity exceeds 0,1Bq/l or the gross beta activity exceeds 1,0Bq/l, analysis for specific radionuclides is required.
(4) The Welsh Ministers may set alternative screening levels for gross alpha activity and gross beta activity where it can be demonstrated by the water undertaker that the alternative levels are in compliance with an indicative dose of 0,1 mSv.
(5) The radionuclides to be measured must be based on all relevant information about likely sources of radioactivity.
Marginal Citations
M1Where appropriate, gross beta activity may be replaced by residual beta activity after subtraction of the K-40 activity concentration.
4.—(1) The indicative dose must be calculated from—
(a)the measured radionuclide concentrations and the dose coefficients referred to as “standard values and relationships” in Article 13, and recommended for the estimation of doses from internal exposure in the definition of “standard values and relationships” in Article 4(96), of Council Directive 2013/59/Euratom laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation M2;or
(b)more recent information recognised by the Welsh Ministers, on the basis of the annual intake of water (730 l for adults).
(2) Where the following formula is satisfied, it can be assumed that the indicative dose is less than the parametric value of 0,1 mSv and no further investigation is required—
where—
“Ci(obs)” means observed concentration of radionuclide I;
“Ci(der)” means derived concentration of radionuclide i;
“n” means number of radionuclides detected.
This table includes values for the most common natural and artificial radionuclides: these are precise values, calculated for a dose of 0.1 mSy, an annual intake of 730 litres and using the dose coefficients referred to as “standard values and relationships” in Article 13, and recommended for the estimation of doses from internal exposure in the definition of “standard values and relationships” in Article 4(96), of Council Directive 2013/59/Euratom. 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.
1 This table allows only for the radiological properties of uranium, not for its chemical toxicity. | ||
Origin | Nuclide | Derived concentration |
Natural | U-238 1 | 3,0 Bq/1 |
U-234 1 | 2,8 Bq/1 | |
Ra-226 | 0,5 Bq/1 | |
Ra-228 | Ra-228 | |
Pb-210 | 0,2 Bq/1 | |
Po-210 | 0,1 Bq/1 | |
Artificial | C-14 | 240 Bq/1 |
Sr-90 | 4,9 Bq/1 | |
Pu-239/Pu-240 | 0,6 Bq/1 | |
Am-241 | 0,7 Bq/1 | |
Co-60 | 40 Bq/1 | |
Cs-134 | 7,2 Bq/1 | |
Cs-137 | 11 Bq/1 | |
1-131 | 6,2 Bq/1 |
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:
1 The limit of detection must be calculated according to the ISO standard 11929: Determination of the characteristic limits (decision threshold, detection limit, and limits of confidence interval) for measurements of ionising radiation – Fundamentals and application, with probabilities of errors of 1st and 2nd kind of 0,05 each. | ||
2 Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded uncertainties with an expansion factor of 1,96 according the ISO Guide for the Expression of Uncertainty in Measurement. | ||
3 The limit of detection for tritium and for radon is 10% of its parametric value of 100 Bq/1. | ||
4 The limit of detection for gross alpha activity and gross beta activities are 40% of the screening values of 0,1 and 1,0 Bq/1 respectively. | ||
5 This limit of detection applies only to initial screening for indicative dose for a new water source; if initial checking indicates that it is not plausible that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0,08 Bq/1 for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required. | ||
Parameters and radionuclides | Limit of detection (Notes 1,2) | Notes |
Tritium | 10 Bq/1 | Note 3 |
Radon | 10 Bq/1 | Note 3 |
gross alpha | 0,04 Bq/1 | Note 4 |
gross beta | 0,4 Bq/1 | Note 4 |
U-238 | 0,02 Bq/1 | |
U-234 | 0,02 Bq/1 | |
Ra-226 | 0,04 Bq/1 | |
Ra-228 | 0,02 Bq/1 | Note 5 |
Pb-210 | 0,02 Bq/1 | |
Po-210 | 0,01 Bq/1 | |
C-14 | 20 Bq/1 | |
Sr-90 | 0,4 Bq/1 | |
Pu-239/Pu-240 | 0,04 Bq/1 | |
Am-241 | 0,06 Bq/1 | |
Co-60 | 0,5 Bq/1 | |
Cs-134 | 0,5 Bq/1 | |
Cs-137 | 0,5 Bq/1 | |
I-131 | 0,5 Bq/1 | |
Notes: |
Marginal Citations
M2OJ No L 13, 17.1.2014, p.1. For the estimation of doses from internal exposure, Article 4(96) refers to chapter 1 of ICRP (International Commission on Radiological Protection) Publication 119. See Table F.1 in Annex F. A copy of ICRP Publication 119 can be obtained from the ICRP website (www.icrp.org) or from the Welsh Government Water Branch, Welsh Government, Cathays Park, Cardiff, CF10 3NQ.
Regulations 15 and 16
(1) Parameter | (2)Method of analysis |
---|---|
E. coli and coliform bacteria | EN ISO 9308-1 M3 or EN ISO 9308-2 M4 |
Enterococci | EN ISO 7899-2 M5 |
Pseudomonas aeruginosa | EN ISO 16266 M6 |
Enumeration of culturable microorganisms – colony count 22°c | EN ISO 6222 M7 |
Enumeration of culturable microorganisms – colony count 36°c | EN ISO 6222 |
Clostridium perfringens including spores | EN ISO 14189 M8 |
Marginal Citations
M3This standard entitled “Water quality - Enumeration of Escherichia coli and coliform bacteria - Part 1: Membrane filtration method for waters with low bacterial background flora (ISO 9308-1:2014)” was approved by the European Committee for Standardization (CEN) on 18 January 2017. Under reference BS EN ISO 9308-1:2014+A1:2017, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 92379 1).
M4This standard entitled “Water quality - Enumeration of Escherichia coli and coliform bacteria - Part 2: Most probable number method (ISO 9308-2:2012)” was approved by the European Committee for Standardization (CEN) on 11 April 2014. Under reference BS EN ISO 9308-2:2014, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 84023 4).
M5This standard entitled “Water quality - Detection and enumeration of intestinal enterococci - Part 2: Membrane filtration method (ISO 7899-2:2000)” was approved by the European Committee for Standardization (CEN) on 11 April 2014. Under reference BS EN ISO 7899-2:2000, it is published as a UK standard by the British Standards Institution (ISBN 0 580 34953 5).
M6This standard entitled “Water quality - Detection and enumeration of Pseudomonas aeruginosa - Method by membrane filtration (ISO 16266:2006)” was approved by the European Committee for Standardization (CEN) on 11 January 2008. Under reference BS EN ISO 16266:2008, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 59736 7).
M7This standard entitled “Water quality - Enumeration of culturable micro-organisms - Colony count by inoculation in a nutrient agar culture medium (ISO 6222:1999)” was approved by the European Committee for Standardization (CEN) on 16 March 1999. Under reference BS EN ISO 6222:1999, it is published as a UK standard by the British Standards Institution (ISBN 0 580 32495 8).
M8This standard entitled Water quality - Enumeration of Clostridium perfringens - Method using membrane filtration (ISO 14189:2013)” was approved by the European Committee for Standardization (CEN) on 15 July 2016. Under reference BS EN ISO 14189:2016, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 92184 1).
F6... |
Textual Amendments
F6Sch. 5 Table A2 revoked (1.1.2020 following 11.59 pm on 31.12.2019) by The Water Supply (Water Quality) Regulations 2018 (S.I. 2018/647), reg. 39(3)
The uncertainty of measurement laid down in this table must not be used as an additional tolerance to the parametric values set out in Schedules 1 and 2.
1 “Uncertainty of measurement” is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurement, based on the information used. The performance criterion for measurement uncertainty (k = 2) is at least the percentage of the parametric value stated in the table. If the value of uncertainty of measurement cannot be met, the best available technique must be selected (up to 60 % of the parametric value). | |
2 The method determines total cyanide in all forms. | |
3 Reference method: European standard EN ISO 8467 entitled “Water quality - Determination of permanganate index (ISO 8467)”M9. | |
4 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. | |
5 The performance characteristics apply to individual substances, specified at 25% of the parametric value in Part 1 of Table B in Schedule 1. | |
6 The performance characteristics apply to individual substances, specified at 50 % of the parametric value in Part 1 of Table B in Schedule 1. | |
7 The uncertainty of measurement must be estimated at the level of 3 mg/l of the total organic carbon (TOC) in accordance with European standard EN 1484 entitled “Water analysis - Guidelines for the determination of total organic carbon and dissolved organic carbon”M10 and dissolved organic carbon (DOC) shall be used. | |
8 The uncertainty of measurement must be estimated at the level of 1,0 NTU in accordance with European standard EN ISO 7027-1 entitled “Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1”M11. | |
(1)Parameter | (2)Uncertainty of measurement % of the parametric value (except for pH) 1 |
---|---|
Aluminium | 25 |
Ammonium | 40 |
Antimony | 40 |
Arsenic | 30 |
Benzene | 40 |
Benzo(a)pyrene 2 | 50 |
Boron | 25 |
Bromate | 40 |
Cadmium | 25 |
Chloride | 15 |
Chromium | 30 |
Colour | 20 |
Conductivity | 20 |
Copper | 25 |
Cyanide 3 | 30 |
1,2-dichloroethane | 40 |
Fluoride | 20 |
Hydrogen ion concentration pH (expressed in pH units) | 0.2 |
Iron | 30 |
Lead | 25 |
Manganese | 30 |
Mercury | 30 |
Nickel | 25 |
Nitrate | 15 |
Nitrite | 20 |
Oxidisability 4 | 50 |
Pesticides 5 | 30 |
Polycyclic aromatic hydrocarbons 6 | 50 |
Selenium | 40 |
Sodium | 15 |
Sulphate | 15 |
Tetrachloroethene 6 | 30 |
Tetrachloromethane | 30 |
Trichloroethene 7 | 40 |
Trihalomethanes: total 6 | 40 |
Total organic carbon 8 | 30 |
Turbidity 9 | 30 |
Notes: |
Marginal Citations
M9This standard was approved by the European Committee for Standardization (CEN) on 3 November 1994. Under reference EN ISO 8467:1995, it is published as a UK standard by the British Standards Institution (ISBN 0 580 23435 5).
M10This standard was approved by the European Committee for Standardization (CEN) on 6 April 1997. Under reference BS EN 1484:1997, it is published as a UK standard by the British Standards Institution (ISBN 0 580 28372 0).
M11This standard was approved by the European Committee for Standardization (CEN) on 15 April 2016. Under reference BS EN ISO 7027-1:2016, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 81961 2)
Regulation 40
(1) Regulations to be amended | (2) Reference | (3) Provision to be amended | (4) Amendments |
---|---|---|---|
The Water Quality and Supply (Fees) (Undertakers Wholly or Mainly in Wales) Order 2016 | S.I. 2016/843 (W. 213) | The Schedule | In the English language text, in each place it occurs, for “Water Supply (Water Quality) Regulations 2010” substitute “ Water Supply (Water Quality) Regulations 2018 ” |
In the Welsh language text, in each place it occurs for “Rheoliadau Cyflenwi Dŵr (Ansawdd Dŵr) 2010” substitute Rheoliadau Cyflenwi Dŵr (Ansawdd Dŵr) 2018” |
(1) Regulations revoked | (2) Reference | (3) Extent of revocation |
---|---|---|
The 2010 Regulations | S.I. 2010/994 (W. 99) | The whole Regulations |
The National Treatment Agency (Abolition) and the Health and Social Care Act 2012 (Consequential, Transitional and Savings Provisions) Order 2013 M12 | S.I. 2013/235 | Paragraph 152 of Schedule 2 |
The Construction Products Regulations 2013 | S.I. 2013/1387 | Paragraph 7 of Schedule 5 |
The Private Water Supplies (Wales) Regulations 2017 | S.I. 2017/1041 (W. 270) | Regulation 25 |
The Water Act 2014 (Consequential Amendments etc.) Order 2017 | S.I. 2017/506 | Article 28 |
Marginal Citations
M12There are amendments not relevant to these Regulations.
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