{
  "url": "https://openlegislation.uk/private-water-supplies-regulations-1991/schedule-3",
  "json_url": "https://openlegislation.uk/private-water-supplies-regulations-1991/schedule-3.json",
  "legislation": "uksi/1991/2790",
  "legislation_title": "The Private Water Supplies Regulations 1991",
  "legislation_url": "https://openlegislation.uk/private-water-supplies-regulations-1991",
  "path": "schedule/3",
  "kind": "schedule",
  "number": "3",
  "heading": "SAMPLING FREQUENCIES FOR CLASSES A, B, 1 AND 2",
  "text": "Sampling Frequency (number per annum)\nSampling Frequency (number per annum)\nParameter\nClass A and Class 1\nClass B and Class 2\nReduced\nStandard\nIncreased\nReduced\nStandard\nIncreased\n(1)\n(2)\n(3)\n(4)\n(5)\n(6)\n(7)\nNotes:\n(i) Increased or reduced sampling where permitted or required may be confined to the substance in question.\n(ii) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3-cd) pyrene.\nPART I:\nConductivity\n6\n12\n24\n4\n6\n12\nHydrogen ion\n6\n12\n24\n4\n6\n12\nOdour (qualitative)\n6\n12\n24\n4\n6\n12\nTaste (qualitative)\n6\n12\n24\n4\n6\n12\nPART II:\nOdour (quantitative)\n—\n4\n24\n—\n4\n12\nTaste (quantitative)\n—\n4\n24\n—\n4\n12\nTurbidity\n—\n4\n24\n—\n4\n12\nTemperature\n—\n4\n24\n—\n4\n12\nNitrate\n—\n4\n24\n—\n4\n12\nNitrite\n—\n4\n24\n—\n4\n12\nAmmonium\n—\n4\n24\n—\n4\n12\nIron\n—\n4\n24\n—\n4\n12\nAluminium\n—\n4\n24\n—\n4\n12\nManganese\n—\n4\n24\n—\n4\n12\nColour\n—\n4\n24\n—\n4\n12\nPART III:\nTrihalomethanes\n1\n4\n12\n1\n4\n12\nTetrachloromethanes\n1\n4\n12\n1\n4\n12\nTrichloroethene\n1\n4\n12\n1\n4\n12\ntetrachloroethene\n1\n4\n12\n1\n4\n12\nCopper\n1\n4\n12\n1\n4\n12\nLead\n1\n4\n12\n1\n4\n12\nZinc\n1\n4\n12\n1\n4\n12\nPesticides and related prodcts(i)\n1\n4\n12\n1\n4\n12\nPolycyclic aromatic hydrocarbons(ii)\n1\n4\n12\n1\n4\n12\nPART IV:\nChloride\n—\n1\n12\n—\n1\n12\nSulphate\n—\n1\n12\n—\n1\n12\nCalcium\n—\n1\n12\n—\n1\n12\nMagnesium\n—\n1\n12\n—\n1\n12\nSodium\n—\n1\n12\n—\n1\n12\nPotassium\n—\n1\n12\n—\n1\n12\nDry residues\n—\n1\n12\n—\n1\n12\nOzidizability (permanganatge value)\n—\n1\n12\n—\n1\n12\nTotal organic carbon\n—\n1\n12\n—\n1\n12\nBoron\n—\n1\n12\n—\n1\n12\nSurfactants\n—\n1\n12\n—\n1\n12\nPhosphorus\n—\n1\n12\n—\n1\n12\nFluoride\n—\n1\n12\n—\n1\n12\nBarium\n—\n1\n12\n—\n1\n12\nSilver\n—\n1\n12\n—\n1\n12\nArsenic\n—\n1\n12\n—\n1\n12\nCadmium\n—\n1\n12\n—\n1\n12\nCyanide\n—\n1\n12\n—\n1\n12\nChromium\n—\n1\n12\n—\n1\n12\nMercury\n—\n1\n12\n—\n1\n12\nNickel\n—\n1\n12\n—\n1\n12\nAntimony\n—\n1\n12\n—\n1\n12\nSelenium\n—\n1\n12\n—\n1\n12\nTotal Hardness\n—\n1\n12\n—\n1\n12\nAlkalinity\n—\n1\n12\n—\n1\n12\nPART V:\nTotal coliforms\n—\n24\n—\n—\n12\n24\nFaecal coliforms\n—\n24\n—\n—\n12\n24\nResidual disinfectant\n—\n24\n—\n—\n12\n24\nColony counts\n—\n24\n—\n—\n12\n24",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1991/2790/schedule/3",
    "retrieved_at": "2026-10-29T14:32:48.534038+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."
}