# The Public Water Supplies (Scotland) Regulations 2014, Schedule 1: PRESCRIBED CONCENTRATIONS AND VALUES Extent: S TABLE A MICROBIOLOGICAL PARAMETERS 1 The parametric values in Part 2 are not required to protect human health (since the parametric values in Part 1 are sufficient for that purpose). The values in Part 2 are not therefore set for the purposes of Article 5(3) of the Directive. 2 Compliance required as to 95% of samples from each service reservoir (regulation 4(4)). (1)Item (2)Parameter (3)Concentration orvalue (maximum) (4)Units ofmeasurement (5)Point ofcompliance Part 1 1. Enterococci 0 Number/100ml Consumer's tap 2. Escherichia coli 0 Number/100ml Consumer's tap Part 21 3. Coliform bacteria 0 Number/100ml Service reservoir2 0 Number/100ml Treatment works 4. Escherichia coli 0 Number/100ml Service reservoir 0 Number/100ml Treatment works Notes— TABLE B CHEMICAL PARAMETERS (1) (2) (3) (4) (5) (6) Notes— Note 1: The parametric value of 0.10 μg/l 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: A parametric value of 2.4 mgB/l must be applied when desalinated water is the predominant water source of the supply system concerned or in regions where geological conditions could lead to high levels of boron in groundwater. Note 3: A parametric value of 0.70 mg/l must be applied where a disinfection method that generates this parameter, in particular chlorine dioxide, is used for disinfection of water intended for human consumption. This parametric value applies only if such disinfection methods are used. Note 4: This parameter must be measured only when disinfection methods that can generate HAAs are used for the disinfection of water intended for human consumption. Note 5: This parameter must be measured only in the event of potential blooms in source water (increasing cyanobacterial cell density or bloom forming potential). Note 6: See also regulation 4(2)(c). Note 7: The corresponding parametric value applies to each “other pesticide” individually. Note 8: A parametric value of 30 μg/l must be applied for regions where geological conditions could lead to high levels of selenium in groundwater. Note 9: The sum of concentrations of these two parameters. Note 10: The parametric value of 0.50 μg/l 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. Item Parameter Concentrat-ion or value (maximum) Units of measurement Point of compliance Notes Part 1 1. Acrylamide 0.10 μg/l Consumer’s tap Note 1 2. Antimony 10 μgSb/l Consumer’s tap 3. Arsenic 10 μgAs/l Consumer’s tap 4. Benzene 1.0 μg/l Consumer’s tap 5. Benzo(a)pyrene 0.010 μg/l Consumer’s tap 6. Bisphenol A 2.5 μg/l Consumer’s tap 7. Boron 1.5 mgB/l Consumer’s tap Note 2 8. Bromate 10 μgBrO3/l Consumer’s tap 9. Cadmium 5.0 μgCd/l Consumer’s tap 10. Chlorate 0.25 mg/l Consumer’s tap Note 3 11. Chlorite 0.25 mg/l Consumer’s tap Note 3 12. Chromium 50 μgCr/l Consumer’s tap 13. Copper 2.0 mgCu/l Consumer’s tap 14. Cyanide 50 μgCN/l Consumer’s tap 15. 1,2-dichloroethane 3.0 μg/l Consumer’s tap 16. Epichlorohydrin 0.10 μg/l Consumer’s tap Note 1 17. Fluoride 1.5 mgF/l Consumer’s tap 18. HAAs 60 μg/l Consumer’s tap Note 4 19. Lead 10 μgPb/l Consumer’s tap 20. Mercury 1.0 μgHg/l Consumer’s tap 21. Microcystin-LR 1.0 μg/l Consumer’s tap Note 5 22. Nickel 20 μgNi/l Consumer’s tap 23. Nitrate 50 mgNO3/l Consumer’s tap Note 6 24. Nitrite 0.50 mgNO2/l Consumer’s tap Note 6 0.10 mgNO2/l Treatment works 25. Pesticides— Aldrin 0.030 μg/l Consumer’s tap Dieldrin 0.030 μg/l Consumer’s tap Heptachlor 0.030 μg/l Consumer’s tap Heptachlor epoxide 0.030 μg/l Consumers’ tap Other pesticide 0.10 μg/l Consumer’s tap Note 7 26. Pesticides: total 0.50 μg/l Consumer’s tap 27. Sum of PFAS 0.1 μg/l Consumer’s tap 28. PAH Total 0.10 μg/l Consumer’s tap 29. Selenium 20 μgSe/l Consumer’s tap Note 8 30. Tetrachloroethene and trichloroethene 10 μg/l Consumer’s tap Note 9 31. THM: Total 100 μg/l Consumer’s tap 32. Uranium 30 μg/l Consumer’s tap 33. Vinyl chloride 0.50 μg/l Note 10 Part 2 34. Aluminium 200 μgAl/l Consumer’s tap 35. Colour 20 mg/1 Pt/Co Consumer’s tap 36. Iron 200 μgFe/l Consumer’s tap 37. Manganese 50 μgMn/l Consumer’s tap 38. Sodium 200 mgNa/1 Consumer’s tap 39. Tetrachlorometh-ane 3 μg/l Consumer’s tap 40. Turbidity 4 NTU Consumer’s tap TABLE C Indicator Parameters (1) (2) (3) (4) (5) (6) Notes— Note 1: Water must not be aggressive or corrosive. This applies particularly to water undergoing treatment (demineralisation, softening, membrane treatment, reverse osmosis, etc.). Note 2: Where water intended for human consumption is derived from treatment that significantly demineralises or softens water, calcium and magnesium salts could be added to condition the water in order to reduce any possible negative health impact, as well as to reduce the corrosiveness or aggressivity of water and to improve taste. Minimum concentrations of calcium and magnesium or total dissolved solids in softened or demineralised water could be established taking into account the characteristics of water that enters those processes. Note 3: The water must not be corrosive. Note 4: This parameter must be measured if a risk assessment under regulation 30(2) indicates that it is appropriate to do so. Note 5: For water put into bottles or containers (which is not intended for sale for drinking by humans), the unit is number/250ml. Note 6: The water must not be aggressive. Note 7: For water put into bottles or containers (which is not intended for sale for drinking by humans), the minimum value is 4.5 pH units. Note 8: This parameter need not be measured for supplies of less than 10,000 m³ a day. Note 9: Remedial action is to be deemed justified on radiological protection grounds, without further consideration where radon concentrations exceed 1,000 Bq/l. Note 10: If the concentration of tritium exceeds this value, an analysis of the presence of other artificial radionuclides must also be carried out by Scottish Water. Item Parameter Concentration or value (maximum) or state Units of measurement Point of monitoring Notes Part 1 1. Ammonium 0.50 mgNH4/1 Consumer’s tap 2. Chloride 250 mgCl/1 Supply point Note 3 3. Clostridium perfringens (including spores) 0 Number/100ml Supply point Note 4 4. Coliform bacteria 0 Number/100ml Consumer’s tap Note 5 5. Colony count No abnormal change Number/1ml at 22°C Consumer’s tap, service reservoir and treatment works 6. Colour Acceptable to consumers and no abnormal change Consumer’s tap 7. Conductivity 2500 μS/cm at 20°C Supply point Note 6 8. Hydrogen ion 9.5 pH value Consumer’s tap Notes 6 and 7 6.5 (minimum) 9. Odour Acceptable to consumers and no abnormal change Consumer’s tap 10. Sulphate 250 mgSO4/l Supply point Note 3 11. Taste Acceptable to consumers and no abnormal change Consumer’s tap 12. Total organic carbon No abnormal change mgC/1 Supply point Note 8 13. Turbidity 1 NTU Treatment works Part 2 14. Indicative dose 0.10 mSv Supply point 15. Radon 100 Bq/l Supply point Note 9 16. Tritium 100 Bq/l Supply point Note 10 --- Source: https://www.legislation.gov.uk/ssi/2014/364/schedule/1 (the official version) Page: https://openlegislation.uk/public-water-supplies-scotland-regulations-2014/schedule-1 Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.