{
  "url": "https://openlegislation.uk/private-water-supplies-england-regulations-2016/schedule-3/paragraph-8",
  "json_url": "https://openlegislation.uk/private-water-supplies-england-regulations-2016/schedule-3/paragraph-8.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/paragraph/8",
  "kind": "paragraph",
  "number": "8",
  "heading": "Calculation of the ID",
  "text": "(1) The ID must be calculated from—\n(a) the measured radionuclide concentrations and the dose coefficients referred to as “standard values and relationships” in Article 13, and recommended for the estimation of doses from internal exposure in the definition of “standard values and relationships” in Article 4(96), of Council Directive 2013/59/Euratom laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation, or\n(b) more recent information recognised by the Secretary of State, on the basis of the annual intake of water (730 litres for adults).\n(2) Where the following formula is satisfied, it can be assumed that the ID is less than the parametric value of 0,1mSv and no further investigation is required—\n∑ i = 1 n Ci(obs) Ci(der) ≤ 1Where—\n“Ci(obs)” means the observed concentration of radionuclide I;\n“Ci(der)” means the derived concentration of radionuclide I;\n“n” means the number of radionuclides detected.\nDerived concentrations for radioactivity in water intend for human consumption\n1 This Table allows only for the radiological properties of uranium, not for its chemical toxicity.\nOrigin\nNuclide\nDerived concentration\nNatural\nU-2381\n3,0 Bq/1\nU-2341\n2,8 Bq/1\nRa-226\n0,5 Bq/1\nRa-228\n0,2 Bq/1\nPb-210\n0,2 Bq/1\nPo-210\n0,1 Bq/1\nArtificial\nC-14\n240 Bq/1\nSr-90\n4,9 Bq/1\nPu-239/Pu-240\n0,6 Bq/1\nAm-241\n0,7 Bq/1\nCo-60\n40 Bq/1\nCs-134\n7,2 Bq/1\nCs-137\n11 Bq/1\n1-131\n6,2 Bq/1",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Sch. 3 Pt. 3 para. 8(1)(a) substituted (11.7.2018) by The Private Water Supplies (England) (Amendment) Regulations 2018 (S.I. 2018/707), regs. 1(1), 2(11)(f) (with reg. 3)"
    },
    {
      "type": "M",
      "label": "M1",
      "text": "This Table includes values for the most common natural and artificial radionuclides; these are precise values, calculated for a dose of 0,1 mSv, an annual intake of 730 litres and using the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom. Derived concentrations for other radionuclides can be calculated on the same basis, and values can be updated on the basis of more recent information recognised by the Secretary of State."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2016/618/schedule/3/paragraph/8",
    "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."
}