# The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017, Part B: Chemical parameters Extent: S Parameter Parametric value Unit Notes Acrylamide 0.10 μg/l Note 1 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 Note 2 Cadmium 5.0 μg/l Chromium 50 μg/l Copper 2.0 mg/l Note 3 Cyanide 50 μg/l 1,2-dichloroethane 3.0 μg/l Epichlorohydrin 0.10 μg/l Note 1 Fluoride 1.5 mg/l Lead 10 μg/l Note 3 and 4 Mercury 1.0 μg/l Nickel 20 μg/l Note 3 Nitrate 50 mg/l Nitrite 0.50 mg/l 0.10 mg/l Note 5 Pesticides— Note 6 Aldrin 0.030 μg/l Dieldrin 0.030 μg/l Heptachlor 0.030 μg/l Heptachlor epoxide 0.030 μg/l Other pesticide 0.10 μg/l Note 7 Pesticides: total 0.50 μg/l Notes 6 and 8 Polycyclic aromatic hydrocarbons 0.10 μg/l Note 9 Selenium 10 μg/l Tetrachloroethene and trichloroethene 10 μg/l Note 10 Trihalomethanes: total 100 μg/l Notes 2 and 11 Vinyl chloride 0.50 μg/l Note 1 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. Note 2: Where possible, without compromising disinfection, an enforcing authority (in relation a supply of water) must strive for a lower value. Note 3: The parametric value applies to a sample of water obtained by an adequate sampling method at the tap and taken so as to be representative of a weekly average value ingested by consumers of the water. Where appropriate the sampling and monitoring methods must be applied in accordance with any guidelines under Article 7(4) of Council Directive 98/83/EC on the quality of water intended for human consumption. Each enforcing authority in relation to the water must take account of the occurrence of peak levels that may cause adverse effects on human health. Note 4: When implementing measures to achieve compliance with this parametric value, each enforcing authority (in relation supplies of water to premises) must progressively give priority where lead concentrations in the water are highest. Note 5: The additional parametric value of 0.10 mg/l applies only if the water is subject to treatment to improve its quality. The point of compliance for this additional parametric value is the point at which the water flows out from the treatment works. Note 6: “Pesticide” means an organic insecticide, organic herbicide, organic fungicide, organic nematocide, organic acaricide, organic algicide, organic rodenticide, organic slimicide, a related product (including growth regulator) and any relevant metabolite, degradation or reaction product. Only those pesticides which are likely to be present in a supply of water need to be monitored. Note 7: “Other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide. The parametric value applies to each “other pesticide” individually. Note 8: The parametric value for this parameter is the sum of all individual pesticides detected and quantified in the monitoring procedure. Note 9: The parametric value for this parameter is the sum of the concentrations of benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene and indeno(1,2,3-cd)pyrene. Note 10: The parametric value for this parameter is the sum of the concentrations of tetrachloroethene and trichloroethene. Note 11: The parametric value for this parameter is the sum of chloroform, bromoform, dibromochloromethane and bromodichloromethane. --- Source: https://www.legislation.gov.uk/ssi/2017/282/schedule/2/part/B (the official version) Page: https://openlegislation.uk/water-intended-for-human-consumption-private-supplies-scotland-regulations-2017/schedule-2/part-B Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.