{
  "url": "https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2002/schedule-2",
  "json_url": "https://openlegislation.uk/water-supply-water-quality-regulations-northern-ireland-2002/schedule-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/2",
  "kind": "schedule",
  "number": "2",
  "heading": "INDICATOR PARAMETERS",
  "text": "Item\nParameters\nSpecification Concentration or Value (maximum) or State\nUnits of Measurement\nPoint of monitoring\nNotes:\n(i)The water should not be aggressive.\n(ii)Excluding tritium, potassium-40, radon and radon decay products.\n*May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.\n1.\nAmmonium\n0.50\nmgNH4/l\nConsumers' taps\n2.\nChloride\n250\nmgCl/l\nSupply point\n3.\nClostridium perfringens (including spores)\n0\nNumber/100ml\nSupply point\n4.\nColiform bacteria\n0\nNumber/100ml\nConsumers' taps\n5.\nColony counts\nNo abnormal change\nNumber/1ml at 22°C Number/1ml at 37°C\nConsumers' taps, service reservoirs and treatment works\n6.\nConductivity\n2500\nμS/cm at 20°C\nSupply point\n7.\nHydrogen ion\n9.5\npH value\nConsumers' taps\n8.\nSulphate\n250\nmgSO4/l\nSupply point\n9.\nTotal indicative dose (for radioactivity)\n0.10\nmSv/year\nSupply point\n10.\nTotal organic carbon (TOC)\nNo abnormal change\nmgC/l\nSupply point*\n11.\nTritium (for radioactivity)\n100\nBq/l\nSupply point\n12.\nTurbidity\n1\nNTU\nTreatment works",
  "extent": "N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "I",
      "label": "I1",
      "text": "Sch. 2 in operation at 28.11.2002 for specified purposes, see reg. 1(2)"
    },
    {
      "type": "I",
      "label": "I2",
      "text": "Sch. 2 in operation at 25.12.2003 in so far as not already in operation, see reg. 1(4)"
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "(i)The water should not be aggressive."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "*May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "(ii)Excluding tritium, potassium-40, radon and radon decay products."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/2002/331/schedule/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."
}