{
  "url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-3/part-1",
  "json_url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-3/part-1.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/3/part/1",
  "kind": "part",
  "number": "1",
  "heading": "Group A and Group B parameters",
  "text": "Table 1\nGroup A parameters and circumstances for monitoring\n(1) Item number\n(2) Parameter\n(3) Circumstances\n(1)Sampling for this parameter in water supply zones may be substituted by sampling at supply points.\n1\nAluminium\nWhere used as a water treatment chemical or where the water originates from, or is influenced by, surface waters\n2\nAmmonium\nWhere chloramination is practised\n3\nColiform bacteria\nIn all circumstances\n4\nColony counts 22°C\nIn all circumstances\n5\nColour\nIn all circumstances\n6\nConductivity\nIn all circumstances\n7\nE. coli\nIn all circumstances\n8\nHydrogen ion\nIn all circumstances\n9\nIron\nWhere used as a water treatment chemical or where the water originates from, or is influenced by, surface waters\n10\nManganese\nWhere the water originates from, or is influenced by, surface waters\n11\nNitrate\nWhere chloramination is practised\n12\nNitrite\nWhere chloramination is practised\n13\nOdour\nIn all circumstances\n14\nResidual disinfectant\nIn all circumstances\n15\nTaste\nIn all circumstances\n16\nTurbidity\nIn all circumstances\nTable 2\nGroup B1 parameters and circumstances for monitoring to be used for sampling in water supply zones (or supply points)\n(1) Item number\n(2) Parameter\n(3) Circumstances\n(1)Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2).\n(2)Monitoring of this parameter in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, monitoring is required at supply points (see Group B2).\n(3)To monitor for indicative dose.\n(4)In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.\n1\nAluminium\nWhere not used as a water treatment chemical or where the water neither originates from, nor is influenced by, surface waters\n2\nAmmonium\nWhere chloramination is not practised\n3\nAntimony\nIn all circumstances\n4\nArsenic\nIn all circumstances\n5\nBenzene\nIn all circumstances\n6\nBenzo(a)pyrene\nIn all circumstances\n7\nBoron\nIn all circumstances\n8\nBromate\nIn all circumstances\n9\nCadmium\nIn all circumstances\n10\nChloride\nIn all circumstances\n11\nChromium\nIn all circumstances\n12\nClostridium perfringens (including spores)\nIn all circumstances\n13\nCopper\nIn all circumstances\n14\nCyanide\nIn all circumstances\n15\n1, 2 dichloroethane\nIn all circumstances\n16\nEnterococci\nIn all circumstances\n17\nFluoride\nIn all circumstances\n18\nGross alpha\nIn all circumstances\n19\nGross beta\nIn all circumstances\n20\nIron\nWhere not used as a water treatment chemical or where the water neither originates from, nor is influenced by, surface waters\n21\nLead\nIn all circumstances\n22\nManganese\nWhere the water neither originates from, nor is influenced by, surface waters.\n23\nMercury\nIn all circumstances\n24\nNickel\nIn all circumstances\n25\nNitrate\nWhere chloramination is not practised\n26\nNitrite\nWhere chloramination is not practised\n27\nPesticides and related products\nIn all circumstances\n28\nPolycyclic aromatic hydrocarbon\nIn all circumstances\n29\nRadon\nIn all circumstances\n30\nSelenium\nIn all circumstances\n31\nSodium\nIn all circumstances\n32\nSulphate\nIn all circumstances\n33\nTetrachloroethene\nIn all circumstances\n34\nTetrachloromethane\nIn all circumstances\n35\nTotal organic carbon\nIn all circumstances\n36\nTrichloroethene\nIn all circumstances\n37\nTrihalomethanes: Total\nIn all circumstances\n38\nTritium\nIn all circumstances\nTable 3\nGroup B2 parameters and circumstances for monitoring to be used for sampling at works or in water supply zones (or supply points)\n(1) Item number\n(2) Parameter\n(3) Circumstances\n(1)Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2).\n(2)Monitoring is required at supply points where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, see Group B1.\n(3)To monitor for indicative dose.\n(4)In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.\n1\nBenzene\nIn all circumstances\n2\nBoron\nIn all circumstances\n3\nBromate\nIn all circumstances\n4\nChloride\nIn all circumstances\n5\nClostridium perfringens (including spores) (1)\nIn all circumstances\n6\nCyanide\nIn all circumstances\n7\n1, 2 dichloroethane\nIn all circumstances\n8\nFluoride\nIn all circumstances\n9\nGross alpha\nIn all circumstances\n10\nGross beta\nIn all circumstances\n11\nIndicative dose (1)\nIn all circumstances\n12\nMercury\nIn all circumstances\n13\nNitrite\nWhen chloramination is not practised\n14\nPesticides and related products\nIn all circumstances\n15\nRadon\nIn all circumstances\n16\nSulphate\nIn all circumstances\n17\nTetrachloroethene/Trichloroethene (1)\nIn all circumstances\n18\nTetrachloromethane\nIn all circumstances\n19\nTotal organic carbon\nIn all circumstances\n. . .\n. . .\n. . .\n21\nTritium\nIn all circumstances\nTable 4\nGroup A1 parameters\n(1) Item number\n(2) Parameter\n1\nColiform bacteria\n2\nE. coli\n3\nResidual disinfectant\nTable 5\nGroup A2 parameters\n(1) Item number\n(2) Parameter\n1\nColiform bacteria\n2\nColony counts 22°C\n3\nE. coli\n4\nNitrite\n5\nResidual disinfectant\n6\nTurbidity\nTable 6\nGroup A3 parameters\n(1) Item number\n(2) Parameter\n1\nConductivity\nTable 7\nGroup A4 parameters\n(1) Item number\n(2) Parameter\n1\nAluminium\n2\nAmmonium\n3\nColony counts 22°C\n4\nColour\n5\nConductivity\n6\nHydrogen ion\n7\nIron\n8\nManganese\n9\nNitrate\n10\nNitrite\n11\nOdour\n12\nTaste\n13\nTurbidity",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Sch. 3 substituted (11.7.2018) by The Water Supply (Water Quality) (Amendment) Regulations 2018 (S.I. 2018/706), regs. 1(1), 2(13)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Words in Sch. 3 Pt. 1 substituted (29.3.2019) by The Environment, Food and Rural Affairs (Miscellaneous Amendments etc.) Regulations 2019 (S.I. 2019/526), regs. 1(2), 6(3)(a)(i)"
    },
    {
      "type": "F",
      "label": "F3",
      "text": "Words in Sch. 3 Pt. 1 substituted (29.3.2019) by The Environment, Food and Rural Affairs (Miscellaneous Amendments etc.) Regulations 2019 (S.I. 2019/526), regs. 1(2), 6(3)(a)(ii)"
    },
    {
      "type": "F",
      "label": "F4",
      "text": "Words in Sch. 3 Pt. 1 substituted (29.3.2019) by The Environment, Food and Rural Affairs (Miscellaneous Amendments etc.) Regulations 2019 (S.I. 2019/526), regs. 1(2), 6(3)(a)(iii)"
    },
    {
      "type": "F",
      "label": "F5",
      "text": "Words in Sch. 3 Pt. 1 substituted (29.3.2019) by virtue of The Environment, Food and Rural Affairs (Miscellaneous Amendments etc.) Regulations 2019 (S.I. 2019/526), regs. 1(2), 6(3)(a)(iv)"
    },
    {
      "type": "F",
      "label": "F6",
      "text": "Word in Sch. 3 Pt. 1 omitted (29.3.2019) by The Environment, Food and Rural Affairs (Miscellaneous Amendments etc.) Regulations 2019 (S.I. 2019/526), regs. 1(2), 6(3)(a)(v)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2016/614/schedule/3/part/1",
    "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."
}