{
  "url": "https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2002/schedule-1/part-2",
  "json_url": "https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2002/schedule-1/part-2.json",
  "legislation": "nisr/2002/331",
  "legislation_title": "The Water Supply (Water Quality) Regulations (Northern Ireland) 2002",
  "legislation_url": "https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2002",
  "path": "schedule/1/part/2",
  "kind": "part",
  "number": "TABLE B.",
  "heading": "CHEMICAL PARAMETERS",
  "text": "Part I:\nDirective requirements\nItem\nParameters\nConcentration or Value (maximum)\nUnits of Measurement\nPoint of compliance\nNotes:\n(i)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.\n(ii)See also regulation 6(6).\n(iii)See also regulation 4(2)(d).\n(iv)See the definition of “pesticides and related products” in regulation 2.\n(v)The parametric value applies to each individual pesticide.\n(vi)“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.\n(vii)The specified compounds are:\nbenzo(b)fluoranthene\nbenzo(k)fluoranthene\nbenzo(ghi)perylene\nindeno(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.\n(viii)The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n(ix)The specified compounds are:\nchloroform\nbromoform\ndibromochloromethane\nbromodichloromethane.\nThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n1.\nAcrylamide\n0.10\nμg/l\n2.\nAntimony\n5.0\nμgSb/l\nConsumers' taps\n3.\nArsenic\n10\nμgAs/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\nmgB/l\nConsumers' taps\n7.\nBromate\n10\nμgBrO3/l\nConsumers' taps\n8.\nCadmium\n5.0\nμgCd/l\nConsumers' taps\n9.\nChromium\n50\nμgCr/l\nConsumers' taps\n10.\nCopper\n2.0\nmgCu/l\nConsumers' taps\n11.\nCyanide\n50\nμgCN/l\nConsumers' taps\n12.\n1, 2 dichloroethane\n3.0\nμg/l\nConsumers' taps\n13.\nEpichlorohydrin\n0.10\nμg/l\n14.\nFluoride\n1.5\nmgF/l\nConsumers' taps\n15.\nLead\n(a) 25, from 25th December 2003 until immediately before 25th December 2013\nμgPb/l\nConsumers' taps\n(b) 10, on and after 25th December 2013\nμgPb/l\nConsumers' taps\n16.\nMercury\n1.0\nμgHg/l\nConsumers' taps\n17.\nNickel\n20\nμgNi/l\nConsumers' taps\n18.\nNitrate\n50\nmgNO3/l\nConsumers' taps\n19.\nNitrite\n0.50\nmgNO2/l\nConsumers' taps\n0.10\nTreatment works\n20.\nPesticides }\nAldrin }\nDieldrin }\nHeptachlor }\nHeptachlor epoxide }\n0.030\nμg/l\nConsumers' taps\nother pesticides\n0.10\nμg/l\nConsumers' taps\n21.\nPesticides: Total\n0.50\nμg/l\nConsumers' taps\n22.\nPolycyclic aromatic hydrocarbons\n0.10\nμg/l\nConsumers' taps\n23.\nSelenium\n10\nμgSe/l\nConsumers' taps\n24.\nTetrachloroethene and Trichloroethene\n10\nμg/l\nConsumers' taps\n25.\nTrihalomethanes: Total\n100\nμg/l\nConsumers' taps\n26.\nVinyl chloride\n0.50\nμg/l\nPart II:\nNational requirements\nItem\nParameters\nConcentration or Value (maximum unless otherwise stated)\nUnits of Measurement\nPoint of compliance\n1.\nAluminium\n200\nμgAl/l\nConsumers' taps\n2.\nColour\n20\nmg/l Pt/Co\nConsumers' taps\n3.\nHydrogen ion\n10.0\npH value\nConsumers' taps\n6.5 (minimum)\npH value\n4.\nIron\n200\nμgFe/l\nConsumers' taps\n5.\nManganese\n50\nμgMn/l\nConsumers' taps\n6.\nOdour\n3 at 25°C\nDilution number\nConsumers' taps\n7.\nSodium\n200\nmgNa/l\nConsumers' taps\n8.\nTaste\n3 at 25°C\nDilution number\nConsumers' taps\n9.\nTetrachloromethane\n3\nμg/l\nConsumers' taps\n10.\nTurbidity\n4\nNTU\nConsumers' taps",
  "extent": "N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "(i)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."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "(ii)See also regulation 6(6)."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "(iii)See also regulation 4(2)(d)."
    },
    {
      "type": "footnote",
      "label": "f4",
      "text": "(iv)See the definition of “pesticides and related products” in regulation 2."
    },
    {
      "type": "footnote",
      "label": "f5",
      "text": "(v)The parametric value applies to each individual pesticide."
    },
    {
      "type": "footnote",
      "label": "f6",
      "text": "(vi)“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure."
    },
    {
      "type": "footnote",
      "label": "f7",
      "text": "(vii)The specified compounds are:benzo(b)fluoranthenebenzo(k)fluoranthenebenzo(ghi)peryleneindeno(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."
    },
    {
      "type": "footnote",
      "label": "f8",
      "text": "(viii)The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process."
    },
    {
      "type": "footnote",
      "label": "f9",
      "text": "(ix)The specified compounds are:chloroformbromoformdibromochloromethanebromodichloromethane.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/2002/331/schedule/1/part/2",
    "retrieved_at": "2026-10-29T02:06:16.045012+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."
}