{
  "url": "https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2017/schedule-1/part",
  "json_url": "https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2017/schedule-1/part.json",
  "legislation": "nisr/2017/212",
  "legislation_title": "The Water Supply (Water Quality) Regulations (Northern Ireland) 2017",
  "legislation_url": "https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2017",
  "path": "schedule/1/part",
  "kind": "part",
  "number": null,
  "heading": "Wholesomeness",
  "text": "TABLE A\nMICROBIOLOGICAL PARAMETERS\n1 Where water is supplied from a tanker see regulation 5(3)(a)\n2 Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).\n(1) Item\n(2) Parameters\n(3) Concentration or Value (maximum)\n(4) Unit of measurement\n(5) Point of Compliance1\nPart I: Directive requirements\n1.\nEnterococci\n0\nnumber/100ml\nConsumers' taps\n2.\nEscherichia coli (E. coli)\n0\nnumber/100ml\nConsumers' taps\nPart II: National requirements\n1.\nColiform bacteria\n0\nnumber/100ml\nService reservoirs2 and water treatment works\n2.\nEscherichia coli (E. coli)\n0\nnumber/100ml\nService reservoirs and water treatment works\nTABLE B\nCHEMICAL PARAMETERS\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 Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.\n3 See also regulation 8(5).\n4 See also regulation 5(3)(d).\n5 See the definition of “pesticides and related products” in regulation 2.\n6 The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.\n7 “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.\n8 The specified compounds are benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n9 The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n10 The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n(1) Item\n(2) Parameters\n(3) Concentration or Value (maximum)\n(5) Units of Measurement\n(6) Point of compliance\nPart I: Directive requirements\n1.\nAcrylamide1\n0.10\nµg/l\n2.\nAntimony\n5.0\nµg/l\nConsumers' taps\n3.\nArsenic\n10\nµg/l\nConsumers' taps\n4\nBenzene\n1.0\nµg/l\nConsumers' taps\n5\nBenzo(a)pyrene\n0.010\nµg/l\nConsumers' taps\n6\nBoron\n1.0\nmg/l\nConsumers' taps\n7\nBromate2\n10\nµg/l\nConsumers' taps\n8\nCadmium\n5.0\nµg/l\nConsumers' taps\n9\nChromium\n50\nµg/l\nConsumers' taps\n10\nCopper3\n2.0\nmg/l\nConsumers' taps\n11\nCyanide\n50\nµg/l\nConsumers' taps\n12\n1, 2 dichloroethane\n3.0\nµg/l\nConsumers' taps\n13\nEpichlorohydrin1\n0.10\nµg/l\n14\nFluoride\n1.5\nmg/l\nConsumers' taps\n15\nLead3\n10\nµg/l\nConsumers' taps\n16\nMercury\n1.0\nµg/l\nConsumers' taps\n17\nNickel3\n20\nµg/l\nConsumers' taps\n18\nNitrate4\n50\nmg/l\nConsumers' taps\n19\nNitrite4\n0.50\nmg/l\nConsumers' taps\n0.10\nTreatment works\n20\nPesticides56\nAldrin\nDieldrin\nHeptachlor\nHeptachlor epoxide\n0.030\nµg/l\nConsumers' taps\nother pesticides56\n0.10\nµg/l\nConsumers' taps\n21\nPesticides: Total7\n0.50\nµg/l\nConsumers' taps\n22\nPolycyclic aromatic hydrocarbons8\n0.10\nµg/l\nConsumers' taps\n23\nSelenium\n10\nµg/l\nConsumers' taps\n24\nTetrachloroethene and Trichloroethene9\n10\nµg/l\nConsumers' taps\n25\nTrihalomethanes: Total10\n100\nµg/l\nConsumers' taps\n26\nVinyl chloride1\n0.50\nµg/l\nPart II: National requirements\n1.\nAluminium\n200\nµg/l\nConsumers' taps\n2.\nColour\n20\nmg/l Pt/Co\nConsumers' taps\n3.\nIron\n200\nµg/l\nConsumers' taps\n4.\nManganese\n50\nµg/l\nConsumers' taps\n5.\nOdour\nAcceptable to consumers and no abnormal change\nConsumers' taps\n6.\nSodium\n200\nmg/l\nConsumers' taps\n7.\nTaste\nAcceptable to consumers and no abnormal change\nConsumers' taps\n8.\nTetrachloromethane\n3\nµg/l\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/nisr/2017/212/schedule/1/part",
    "retrieved_at": "2026-10-29T00:51:01.047970+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."
}