{
  "url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-1",
  "json_url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-1.json",
  "legislation": "uksi/2016/614",
  "legislation_title": "The Water Supply (Water Quality) Regulations 2016",
  "legislation_url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016",
  "path": "schedule/1",
  "kind": "schedule",
  "number": "1",
  "heading": "Prescribed concentrations and values",
  "text": "Table A\nMicrobiological parameters\nPart I: Directive requirements\n(1)\n(2)\n(3)\n(4)\n(5)\nItem\nParameters\nConcentration or value (maximum)\nUnits of measurement\nPoint of compliance\n1.\nEnterococci\n0\nnumber/100ml\nConsumers' taps\n2.\nEscherichia coli\n0\nnumber/100ml\nConsumers' taps\n(E. coli)\nPart II: National requirements\n1 Compliance required as to 95% of samples from each service reservoir (regulation 4(6)).\n(1)\n(2)\n(3)\n(4)\n(5)\nItem\nParameters\nConcentration or value (maximum)\nUnits of measurement\nPoint of compliance\n1.\nColiform bacteria\n0\nnumber/100ml\nService reservoirs1 and water treatment works\n2.\nEscherichia coli (E. coli)\n0\nnumber/100ml\nService reservoirs and water treatment works\nTable B\nChemical parameters\nPart I: Directive requirements\n1 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.\n2 See also regulation 4(2)(d).\n3 See the definition of “pesticides and related products” in regulation 2.\n4 The parametric value applies to each individual pesticide.\n5 “Pesticides: total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.\n6 The specified compounds are—\nThe specified compounds are—\n— benzo(b)fluoranthen;\n— benzo(k)fluoranthene;\n— benzo(ghi)perylene;\n— indeno(1,2,3-cd)pyrene.\nThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n7 The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n8 The specified compounds are—\nThe specified compounds are—\n— chloroform;\n— bromoform;\n— dibromochloromethane;\n— bromodichloromethane\nThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n(1)\n(2)\n(3)\n(4)\n(5)\nItem\nParameters\nConcentration or value (maximum)\nUnits of measurement\nPoint of compliance\n1.\nAcrylamide\n0.10\nµg/1\n1\n2.\nAntimony\n5.0\nµgSb/1\nConsumers' taps\n3.\nArsenic\n10\nµgAs/1\nConsumers' taps\n4.\nBenzene\n1.0\nµg/1\nConsumers' taps\n5.\nBenzo(a)pyrene\n0.010\nµg/1\nConsumers' taps\n6.\nBoron\n1.0\nmgB/1\nConsumers' taps\n7.\nBromate\n10\nµgBrO3/1\nConsumers' taps\n8.\nCadmium\n5.0\nµgCd/1\nConsumers' taps\n9.\nChromium\n50\nµgCr/1\nConsumers' taps\n10.\nCopper\n2.0\nmgCu/1\nConsumers' taps\n11.\nCyanide\n50\nµgCN/1\nConsumers' taps\n12.\n1, 2 dichloroethane\n3.0\nµg/1\nConsumers' taps\n13.\nEpichlorohydrin\n0.10\nµg/1\n1\n14.\nFluoride\n1.5\nmgF/1\nConsumers' taps\n15.\nLead\n10\nµgPb/1\nConsumers' taps\n16.\nMercury\n1.0\nµgHg/1\nConsumers' taps\n17.\nNickel\n20\nµgNi/1\nConsumers' taps\n18.\nNitrate2\n50\nmgNO3/1\nConsumers' taps\n19.\nNitrite2\n0.50\nmgNO2/1\nConsumers' taps\n0.10\nTreatment works\n20.\nPesticides34\n0.030\nµg/1\nConsumers' taps\nAldrin\nDieldrin\n0.030\nµg1\nConsumer's taps\nHeptachlor\nHeptachlor epoxide\nOther pesticides\n0.10\nμg/l\nConsumers' taps\n21.\nPesticides: total5\n0.50\nµg/1\nConsumers' taps\n22.\nPolycyclic aromatic hydrocarbon6\n0.10\nµg/1\nConsumers' taps\n23.\nSelenium\n10\nµgSe/1\nConsumers' taps\n24.\nTetrachloroethene and Trichloroethene7\n10\nμg/l\nConsumers' taps\n25.\nTrihalomethanes: Total8\n100\nµg/1\nConsumers' taps\n26.\nVinyl chloride\n0.50\nµg/1\n1\nPart II: National requirements\n(1)\n(2)\n(3)\n(4)\n(5)\nItem\nParameters\nConcentration or value (maximum)\nUnits of measurement\nPoint of compliance\n1.\nAluminium\n200\nµgA1/1\nConsumers' taps\n2.\nColour\n20\nmg/1 Pt/Co\nConsumers' taps\n3.\nIron\n200\nµgFe/1\nConsumers' taps\n4.\nManganese\n50\nµgMn/1\nConsumers' taps\n5.\nOdour\nAcceptable to consumers and no abnormal change\nConsumers' taps\n6.\nSodium\n200\nmgNa/1\nConsumers' taps\n7.\nTaste\nAcceptable to consumers and no abnormal change\nConsumers' taps\n8.\nTetrachloromethane\n3\nµg/1\nConsumers' taps\n9.\nTurbidity\n4\nNTU\nConsumers' taps",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2016/614/schedule/1",
    "retrieved_at": "2026-10-28T23:23:06.508330+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}