# The Private Water Supplies (England) Regulations 2016, Part 1: Wholesomeness Extent: E+W+S+N.I. Table A MICROBIOLOGICAL PARAMETERS Prescribed concentrations or values Parameters Maximum concentration or value Units of measurement E. coli 0 Number/100ml Enterococci 0 Number/100ml In the case of water in bottles or containers: Colony count 22°C 100 Number/ml . . . . . . . . . E. coli 0 Number/250ml Enterococci 0 Number/250ml Pseudomonas aeruginosa 0 Number/250ml Table B CHEMICAL PARAMETERS Part I: Directive requirements - prescribed concentration 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— For these purposes, “pesticides” means— — organic acaricides; — organic algicides; — organic fungicide; — organic herbicides; — organic insecticides; — organic nematocides; — 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— 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— The specified compounds are— — bromodichloromethane; — bromoform; — chloroform; — dibromochloromethane 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 Acrylamide1 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 Epichlorohydrin1 0.10 μg/l Fluoride 1.5 mg/l Lead 10 μg/l Mercury 1.0 μg/l Nickel 20 μg/l Nitrate2 50 mg/l Nitrite2 0.5 (or 0.1 in the case of treatment works) mg/l Pesticides3— 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 total4 0.50 μg/l Polycyclic aromatic hydrocarbons5 0.10 μg/l Selenium 10 μg/l Tetrachloroethene and Trichloroethene6 10 μg/l Trihalomethanes: Total7 100 μg/l Vinyl chloride1 0.50 μg/l Part II: 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 --- Source: https://www.legislation.gov.uk/uksi/2016/618/schedule/1/part/1 (the official version) Page: https://openlegislation.uk/private-water-supplies-england-regulations-2016/schedule-1/part-1 Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.