{
  "url": "https://openlegislation.uk/private-water-supplies-wales-regulations-2017/schedule-1/part-1",
  "json_url": "https://openlegislation.uk/private-water-supplies-wales-regulations-2017/schedule-1/part-1.json",
  "legislation": "wsi/2017/1041",
  "legislation_title": "The Private Water Supplies (Wales) Regulations 2017",
  "legislation_url": "https://openlegislation.uk/private-water-supplies-wales-regulations-2017",
  "path": "schedule/1/part/1",
  "kind": "part",
  "number": "1",
  "heading": "Wholesomeness",
  "text": "TABLE A:\nMICROBIOLOGICAL PARAMETERS\nPrescribed concentrations or values\nParameters\nMaximum concentration or value\nUnits of Measurement\nEscherichia coli (E. coli)\n0\nNumber/100ml\nEnterococci\n0\nNumber/100ml\nIn the case of water in bottles or containers:\nEscherichia coli (E.coli)\n0\nNumber/250ml\nEnterococci\nNumber/250ml\nPseudomonas aeruginosa\n0\nNumber/250ml\nColony count 22ºC\n100\nNumber/ml\nTABLE B:\nCHEMICAL PARAMETERS\nPrescribed concentrations or values\nParameters\nMaximum concentration or value\nUnits of Measurement\n(1)The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.\n(2)See also the nitrate-nitrite formula in regulation 4(1)(c).\n(3)For these purposes “Pesticides” means:\norganic insecticides\norganic herbicides\norganic fungicides\norganic nematocides\norganic acaricides\norganic algicides\norganic rodenticides\norganic slimicides\nrelated products (inter alia, growth regulators) and their relevant metabolites, degradation and reaction products. Only those pesticides likely to be present in a given supply need be monitored.\n(4)“Pesticides total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.\n(5)The specified compounds are:\nbenzo(b)fluoranthene\nbenzo(k)fluoranthene\nbenzo(ghi)perylene\nindeno(1,2,3-cd)pyrene.\nThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\nThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n(6)The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\n(7)The specified compounds are:\nchloroform\nbromoform\ndibromochloromethane\nbromodichloromethane.\nThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\nThe parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.\nAcrylamide\n0.10\nµg/1\nAntimony\n5.0\nµg/1\nArsenic\n10\nµg/1\nBenzene\n1.0\nµg/1\nBenzo(a)pyrene\n0.010\nµg/1\nBoron\n1.0\nmg/1\nBromate\n10\nµg/1\nCadmium\n5.0\nµg/1\nChromium\n50\nµg/1\nCopper\n2.0\nmg/1\nCyanide\n50\nµg/1\n1.2 dichloroethane\n3.0\nµg/1\nEpichlorohydrin\n0.10\nµg/1\nFluoride\n1.5\nmg/1\nLead\n10\nµg/1\nµg/1\nMercury\n1.0\nµg/1\nNickel\n20\nµg/1\nNitrate\n50\nmg/l\nNitrite\n0.5 (or 0.1 in the case of treatment works)\nmg/l\nPesticides —\nAldrin\n0.030\nµg/1\nDieldrin\n0.030\nµg/1\nHeptachlor\n0.030\nµg/1\nHeptachlor epoxide\n0.030\nµg/1\nOther pesticides\n0.10\nµg/1\nPesticides total\n0.50\nµg/1\nPolycyclic aromatic hydrocarbons\n0.10\nµg/1\nSelenium\n10\nµg/1\nTetrachloroethene and Trichloroethene\n10\nµg/1\nTrihalomethanes: Total\n100\nµg/1\nVinyl chloride\n0.50\nµg/1\nNational requirements – Prescribed concentrations or values\nParameters\nMaximum concentration or value\nUnits of Measurement\nAluminium\n200\nµg/1\nColour\n20\nmg/l Pt/Co\nIron\n200\nµg/1\nManganese\n50\nµg/1\nOdour\nAcceptable to consumers and no abnormal change\nSodium\n200\nmg/l\nTaste\nAcceptable to consumers and no abnormal change\nTetrachloromethane\n3\nµg/1\nTurbidity\n4\nNTU",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "I",
      "label": "I1",
      "text": "Sch. 1 Pt. 1 in force at 20.11.2017, see reg. 1"
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "(1)The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "(2)See also the nitrate-nitrite formula in regulation 4(1)(c)."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "(3)For these purposes “Pesticides” means: organic insecticides organic herbicides organic fungicides organic nematocides organic acaricides organic algicides organic rodenticides organic slimicides related products (inter alia, growth regulators) and their relevant metabolites, degradation and reaction products. Only those pesticides likely to be present in a given supply need be monitored."
    },
    {
      "type": "footnote",
      "label": "f4",
      "text": "(4)“Pesticides total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process."
    },
    {
      "type": "footnote",
      "label": "f5",
      "text": "(5)The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(1,2,3-cd)pyrene. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process."
    },
    {
      "type": "footnote",
      "label": "f6",
      "text": "(6)The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process."
    },
    {
      "type": "footnote",
      "label": "f7",
      "text": "(7)The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2017/1041/schedule/1/part/1",
    "retrieved_at": "2026-10-28T23:24:57.489600+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."
}