{
  "url": "https://openlegislation.uk/private-water-supplies-regulations-northern-ireland-2017/schedule-1/part-2",
  "json_url": "https://openlegislation.uk/private-water-supplies-regulations-northern-ireland-2017/schedule-1/part-2.json",
  "legislation": "nisr/2017/211",
  "legislation_title": "The Private Water Supplies Regulations (Northern Ireland) 2017",
  "legislation_url": "https://openlegislation.uk/private-water-supplies-regulations-northern-ireland-2017",
  "path": "schedule/1/part/2",
  "kind": "part",
  "number": "2",
  "heading": "Indicator Parameters",
  "text": "TABLE C\nPrescribed concentrations and values\n1 The water must not be aggressive.\n2 Excluding tritium, potassium-40, radon and radon decay products.\n3 Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out under Schedule 3 Part 1 to ensure efficacy of treatment.\n4 If the gross alpha activity exceeds 0.1Bq/l or the gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required.\n5 If tritium concentration exceeds its parametric value an investigation (which may include analysis) of the presence of other artificial radionuclides must be carried out.\n6 Remedial action is deemed to be justified on radiological ground without further consideration, where radon exceeds 1,000Bq/l.\n7 Only in the case of surface water treatment where the parametric value should be strived for the water ex-treatment works.\nParameter\nParametric value\nUnit\nAmmonium\n0.50\nmg/l\nChloride1\n250\nmg/l\nClostridium perfringens\n(including spores)\n0\nnumber/100 ml\nColiform bacteria\n0\nNumber/100ml\nColony count 22 °C\nNo abnormal change\nnumber/1 ml\nConductivity1\n2500\nμS/cm at 20 °C\nHydrogen ion concentration1\n≥ 6.5 and ≤ 9.5\npH units\nIndicative Dose (for radioactivity)234\n0.10\nmSv\nSulphate1\n250\nmg/l\nRadon (for radioactivity)36\n100\nBq/l\nTotal organic carbon\nNo abnormal change\nmg/l\nTritium (for radioactivity)35\n100\nBq/l\nTurbidity7\n1\nNTU",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/2017/211/schedule/1/part/2",
    "retrieved_at": "2026-10-29T00:51:01.602850+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."
}