{
  "url": "https://openlegislation.uk/private-water-supplies-england-regulations-2016/schedule-3/part-2",
  "json_url": "https://openlegislation.uk/private-water-supplies-england-regulations-2016/schedule-3/part-2.json",
  "legislation": "uksi/2016/618",
  "legislation_title": "The Private Water Supplies (England) Regulations 2016",
  "legislation_url": "https://openlegislation.uk/private-water-supplies-england-regulations-2016",
  "path": "schedule/3/part/2",
  "kind": "part",
  "number": "2",
  "heading": "Analytical methods",
  "text": "Table 1\nPrescribed methods of analysis\nParameter\nMethod\nClostridium perfringens (including spores)\nBS-EN ISO 14189\nColiform bacteria and E. coli\nBS-EN ISO 9308-1 and BS-EN ISO 9308-2\nColony count 22°C-enumeration of\nculturable microorganisms\nBS-EN ISO 6222\nColony count 37°C-enumeration of\nculturable microorganisms\nBS-EN ISO 6222\nEnterococci\nBS-EN ISO 7899-2\nPseudomonas aeruginosa\nBS-EN ISO 16266\n. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\n. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\nTable 3\nMinimum performance characteristic: uncertainty of measurement\nParameters\nUncertainty of measurement % of the parametric value (except for pH) (1)\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 the percentage of the parametric value stated in the table or better. Measurement uncertainty must be estimated at the level of the parametric value.\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 8467:1993).\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 1 of Table B in Part 1 of Schedule 1.\n(7)The performance characteristics apply to individual substances, specified at 50% of the parametric value in Part 1 of Table B in Part 1 of 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” and dissolved organic carbon (DOC) must be used.\n(9)The uncertainty of measurement must be estimated at the level of 1.0 nephelometric turbidity units (NTU) in accordance with European standard EN ISO 7027-1 entitled “Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1:2016”.\nAluminium\n25\nAmmonium\n40\nAntimony\n40\nArsenic\n30\nBenzene\n40\nBenzo(a)pyrene (2)\n50\nBoron\n25\nBromate\n40\nCadmium\n25\nChloride\n15\nChromium\n30\nColour\n20\nConductivity\n20\nCopper\n25\nCyanide (3)\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 (4)\n50\nPesticides (5)\n30\nPolycyclic aromatic hydrocarbons (6)\n50\nSelenium\n40\nSodium\n15\nSulphate\n15\nTetracloroethene (7)\n30\nTetracloromethane\n30\nTrichloroethene (7)\n40\nTrihalomethanes: total (6)\n40\nTotal organic carbon (8)\n30\nTurbidity (9)\n30",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Sch. 3 Pt. 2 substituted (11.7.2018) by The Private Water Supplies (England) (Amendment) Regulations 2018 (S.I. 2018/707), regs. 1(1), 2(11)(c)(i) (with reg. 3)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Words in Sch. 3 Pt. 2 substituted (11.7.2018) by The Private Water Supplies (England) (Amendment) Regulations 2018 (S.I. 2018/707), regs. 1(1), 2(11)(c)(ii) (with reg. 3)"
    },
    {
      "type": "F",
      "label": "F3",
      "text": "Words in Sch. 3 Pt. 2 substituted (11.7.2018) by The Private Water Supplies (England) (Amendment) Regulations 2018 (S.I. 2018/707), regs. 1(1), 2(11)(c)(iii) (with reg. 3)"
    },
    {
      "type": "F",
      "label": "F4",
      "text": "Sch. 3 Pt. 2 unnumbered table omitted (11.7.2018) by virtue of The Private Water Supplies (England) (Amendment) Regulations 2018 (S.I. 2018/707), regs. 1(1), 2(11)(d)(i) (with reg. 3)"
    },
    {
      "type": "F",
      "label": "F5",
      "text": "Sch. 3 Pt. 2 Table 2 omitted (11.7.2018) by virtue of The Private Water Supplies (England) (Amendment) Regulations 2018 (S.I. 2018/707), regs. 1(1), 2(11)(d)(ii) (with reg. 3)"
    },
    {
      "type": "F",
      "label": "F6",
      "text": "Sch. 3 Pt. 2 Table 3 inserted (11.7.2018) by The Private Water Supplies (England) (Amendment) Regulations 2018 (S.I. 2018/707), regs. 1(1), 2(11)(e) (with reg. 3)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2016/618/schedule/3/part/2",
    "retrieved_at": "2026-10-28T23:23:04.925081+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."
}