# The Water Supply (Water Quality) Regulations 2000, Schedule 1: PRESCRIBED CONCENTRATIONS AND VALUES TABLE A MICROBIOLOGICAL PARAMETERS Part I: Directive requirements Item Parameters Concentration or Value maximum) Units of Measurement Point of compliance 1. Enterococci 0 number/100ml Consumers' taps 2. Escherichia coli (E. coli) 0 number/100ml Consumers' taps Part II: National requirements Item Parameters Concentration or Value maximum) Units of Measurement Point of compliance Note: *Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). 1. Coliform bacteria 0 number/100ml Service reservoirs and water treatment works 2. Escherichia coli (E. coli) 0 number/100ml Service reservoirs and water treatment works TABLE B CHEMICAL PARAMETERS Part I: Directive requirements Item Parameters Concentration or Value maximum) Units of Measurement Point of compliance Notes: (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 regulation 6(6). (iii)See also regulation 4(2)(d). (iv)See the definition of “pesticides and related products” in regulation 2. (v)The parametric value applies to each individual pesticide. (vi)“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. (vii)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. (viii)The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (ix)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. 1. Acrylamide 0.10 μg/l 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 μgBrO3/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 14. Fluoride 1.5 mgF/l Consumers' taps 15. Lead (a) 25, from 25th December 2003 until immediately before 25th December 2013 μgPb/l Consumers' taps (b) 10, on and after 25th December 2013 μgPb/l Consumers' taps 16. Mercury 1.0 μgHg/l Consumers' taps 17. Nickel 20 μgNi/l Consumers' taps 18. Nitrate 50 mgNO3/l Consumers' taps 19. Nitrite 0.50 mgNO2/l Consumers' taps 0.10 Treatment works 20. Pesticides Aldrin 0.030 μg/l Consumers' taps Dieldrin Heptachlor Heptachlor epoxide other pesticides 0.10 μg/l Consumers' taps 21. Pesticides: Total 0.50 μg/l Consumers' taps 22. Polycyclic aromatic hydrocarbons 0.10 μg/l Consumers' taps 23. Selenium 10 μgSe/l Consumers' taps 24. Tetrachloroethene and Trichloroethene 10 μg/l Consumers' taps 25. Trihalomethanes: Total 100 μg/l Consumers' taps 26. Vinyl chloride 0.50 μg/l Part II: National requirements 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. Hydrogen ion 10.0 pH value Consumers' taps 6.5 (minimum) pH value 4. Iron 200 μgFe/l Consumers' taps 5. Manganese 50 μgMn/l Consumers' taps 6. Odour 3 at 25°C Dilution number Consumers' taps 7. Sodium 200 mgNa/l Consumers' taps 8. Taste 3 at 25°C Dilution number Consumers' taps 9. Tetrachloromethane 3 μg/l Consumers' taps 10. Turbidity 4 NTU Consumers' taps --- Source: https://www.legislation.gov.uk/uksi/2000/3184/schedule/1 (the official version) Page: https://openlegislation.uk/water-supply-water-quality-regulations-2000/schedule-1 Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.