{
  "url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-2",
  "json_url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-2.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/2",
  "kind": "schedule",
  "number": "2",
  "heading": "Indicator parameters",
  "text": "1 The water should not be aggressive.\n2 Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment.\n3 Remedial action may be taken by the Secretary of State on radiological protection grounds without further consideration and deemed to be justified where radon concentrates exceed 1,000 Bq/1.\n4 If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides is required.\n5 May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.\n(1)\n(2)\n(3)\n(4)\n(5)\nItem\nParameters\nSpecification concentration or value (maximum unless otherwise stated) or state\nUnits of measurement\nPoint of compliance\n1.\nAmmonium\n0.50\nmgNH4/1\nConsumers' taps\n2.\nChloride1\n250\nmgC1/\nSupply point5\n3.\nClostridium\n0\nNumber/100ml\nSupply point5\nPerfringens\n(including spores)\n4.\nColiform bacteria\n0\nNumber/100ml\nConsumers' taps\n5.\nColony counts\nNo abnormal change\nNumber/1ml at 22°C\nConsumers' taps, service reservoirs and treatment works\n6.\nConductivity1\n2500\nμS/cm at 20°C\nSupply point5\n7.\nHydrogen ion\n9.5 (maximum)\n6.5 (minimum)\npH value\nConsumers' taps\n8.\nIndicative dose2\n0.10\nmSv\nSupply point5\n(a) gross alpha\n0.1\nBq/1\nSupply point5\n(b) gross beta\n1\nBq/1\nSupply point5\n9.\nRadon3\n100\nBq/1\nSupply point\n10.\nSulphate1\n250\nmgSO4/l\nSupply point5\n11.\nTotal organic carbon (TOC)\nNo abnormal change\nmgC/l\nSupply point\n12.\nTritium (for radioactivity)4\n100\nBq/l\nSupply point5\n13.\nTurbidity\n1\nNTU\nTreatment works",
  "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/2",
    "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."
}