{
  "url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-5",
  "json_url": "https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-5.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/5",
  "kind": "schedule",
  "number": "5",
  "heading": "Analytical methodology",
  "text": "Table A1\nMicrobiological parameters for which, subject to regulation 16(6), methods of analysis are specified\n(1) Parameter\n(2) Method of analysis\nE. coli and coliform bacteria\nEN ISO 9308-1 or EN ISO 9308-2\nEnterococci\nEN ISO 7899-2\nPseudomonas aeruginosa\nEN ISO 16266\nEnumeration of culturable microorganisms – colony count 22°c\nEN ISO 6222\nEnumeration of culturable microorganisms – colony count 36°c\nEN ISO 6222\nClostridium perfringens (including spores)\nEN ISO 14189\nTable A2\n. . . . . . . . . . . .\nTable A3\nMinimum performance characteristic uncertainty of measurement\nThe uncertainty of measurement laid down in this table must not be used as an additional tolerance to the parmetric value set out in Schedules 1 and 2.\n(1) Parameters\n(2) Uncertainty of measurement % of the parametric value (except for pH)\n(1)“Uncertainty of measurement” is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurement, based on the information used. The performance criterion for measurement uncertainty (k = 2) is at least the percentage of the parametric value stated in the table.\n(2)If the value of uncertainty of measurement cannot be met, the best available technique must be selected (up to 60% of the parametric value).\n(3)The method determines total cyanide in all forms.\n(4)Reference method: European standard EN ISO 8467 entitled “Water quality – Determination of permanganate index (ISO 8467)”.\n(5)The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30% can be achieved for several pesticides, higher values up to 80 % may be allowed for a number of pesticides.\n(6)The performance characteristics apply to individual substances, specified at 25% of the parametric value in Part I of Table B in Schedule 1.\n(7)The performance characteristics apply to individual substances, specified at 50% of the parametric value in Part I of Table B in Schedule 1.\n(8)The uncertainty of measurement must be estimated at the level of 3 mg/l of the total organic carbon (TOC) in accordance with European standard EN 1484 entitled “Water analysis – Guidelines for the determination of total organic carbon and dissolved organic carbon”.\n(9)The uncertainty of measurement must be estimated at the level of 1.0 nephelometric turbidity units) in accordance with European standard EN ISO 7027-1 entitled “Water quality – Determination of turbidity – Part 1: Quantitative methods (ISO 7027-1”.\nAluminium\n25\nAmmonium\n40\nAntimony\n40\nArsenic\n30\nBenzene\n40\nBenzo(a)pyrene\n50\nBoron\n25\nBromate\n40\nCadmium\n25\nChloride\n15\nChromium\n30\nColour\n20\nConductivity\n20\nCopper\n25\nCyanide\n30\n1,2-dichloroethane\n40\nFluoride\n20\nHydrogen ion concentration pH (expressed in pH units)\n0.2\nIron\n30\nLead\n25\nManganese\n30\nMercury\n30\nNickel\n25\nNitrate\n15\nNitrite\n20\nOxidisability\n50\nPesticides\n30\nPolycyclic aromatic hydrocarbons\n50\nSelenium\n40\nSodium\n15\nSulphate\n15\nTetrachloroethene\n30\nTetrachloromethane\n30\nTrichloroethene\n40\nTrihalomethanes: total\n40\nTotal organic carbon\n30\nTurbidity\n30",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Sch. 5 Table A1 substituted (11.7.2018) by The Water Supply (Water Quality) (Amendment) Regulations 2018 (S.I. 2018/706), regs. 1(1), 2(15)(a) (with reg. 3)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Sch. 5 Table A2 omitted (11.7.2018) by virtue of The Water Supply (Water Quality) (Amendment) Regulations 2018 (S.I. 2018/706), regs. 1(1), 2(15)(b) (with reg. 3)"
    },
    {
      "type": "F",
      "label": "F3",
      "text": "Sch. 5 Table A3 and footnotes inserted (11.7.2018) by The Water Supply (Water Quality) (Amendment) Regulations 2018 (S.I. 2018/706), regs. 1(1), 2(15)(c) (with reg. 3)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2016/614/schedule/5",
    "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."
}