{
  "url": "https://openlegislation.uk/surface-waters-abstraction-for-drinking-water-classification-regulations-northern-ireland-1996/schedule-1",
  "json_url": "https://openlegislation.uk/surface-waters-abstraction-for-drinking-water-classification-regulations-northern-ireland-1996/schedule-1.json",
  "legislation": "nisr/1996/603",
  "legislation_title": "The Surface Waters (Abstraction for Drinking Water) (Classification) Regulations (Northern Ireland) 1996",
  "legislation_url": "https://openlegislation.uk/surface-waters-abstraction-for-drinking-water-classification-regulations-northern-ireland-1996",
  "path": "schedule/1",
  "kind": "schedule",
  "number": "1",
  "heading": "Characteristics of Surface Water intended for the Abstraction of Drinking Water",
  "text": "No in Annex II to 75/440/EEC\nParameters\nDW1\nDW2\nDW3\nG\nI\nG\nI\nG\nI\n(1) The values given are upper limits set in relation to the mean annual temperature (high and low).\n(2) This parameter has been included to satisfy the ecological requirements of certain types of environment.\n* See regulation 6(1)(d)\n(O) See regulation 6(1)(b)\n1\npH\n6.5 to 8.5\n5.5 to 9\n5.5 to 9\n2\nColoration (after simple filtration)\nmg/l Pt scale\n10\n20\n50\n100\n50\n200\n3\nTotal suspended solids\nmg/l SS\n25\n4\nTemperature\n°C\n22\n25\n22\n25\n22\n25\n5\nConductivity\nμs/cm−1 at 20°C\n1,000\n1,000\n1,000\n6\nOdour\n(dilution factor at 25°C)\n3\n10\n20\n7\nNitrates\nmg/l NO3\n25\n50\n50\n50\n8\nFluorides\nmg/l F\n0.7 to 1\n1.5\n0.7 to 1.7\n0.7 to 1.7\n10\nDissolved iron\nmg/l Fe\n0.1\n0.3\n1\n2\n1\n11\nManganese\nmg/l Mn\n0.05\n0.1\n1\n12\nCopper\nmg/l Cu\n0.02\n0.05\n0.05\n1\n13\nZinc\nmg/l Zn\n0.5\n3\n1\n5\n1\n5\n14\nBoron\nmg/l B\n1\n1\n1\n19\nArsenic\nmg/l As\n0.01\n0.05\n0.05\n0.05\n0.1\n20\nCadmium\nmg/l Cd\n0.001\n0.005\n0.001\n0.005\n0.001\n0.005\n21\nTotal Chromium\nmg/l Cr\n0.05\n0.05\n0.05\n22\nLead\nmg/l Pb\n0.05\n0.05\n0.05\n23\nSelenium\nmg/l Se\n0.01\n0.01\n0.01\n24\nMercury\nmg/1 Hg\n0.0005\n0.001\n0.0005\n0.001\n0.0005\n0.001\n25\nBarium\nmg/l Ba\n0.1\n1\n1\n26\nCyanide\nmg/l CN\n0.05\n0.05\n0.05\n27\nSulphates\nmg/l SO4\n150\n250\n150\n250\n150\n250\n28\nChlorides\nmg/l Cl\n200\n200\n200\n29\nSurfactants (reacting with methyl blue)\nmg/l (lauryl sulphate)\n0.2\n0.2\n0.5\n30\nPhosphates\nmg/l P2O5\n0.4\n0.7\n0.7\n31\nPhenols (phenol index) paranitraniline 4 amino-antipyrine\nmg/l C6H5OH\n0.001\n0.001\n0.005\n0.01\n0.1\n32\nDissolved or emulsified hydrocarbons (after extraction by petroleum ether)\nmg/l\n0.05\n0.2\n0.5\n1\n33\nPolycyclic aromatic hydrocarbons\nmg/l\n0.0002\n0.0002\n0.001\n34\nTotal pesticides (parathion, hexachlorocyclohexane, dieldrin)\nmg/l\n0.001\n0.0025\n0.005\n35\nChemical oxygen demand (COD)\nmg/l O2\n30\n36\nDissolved oxygen saturation rate\n% O2\n>70\n>50\n>30\n37\nBiochemical oxygen demand (BOD5) (at 20°C without nitrification)\nmg/l O2\n<3\n<5\n<7\n38\nNitrogen by Kjeldahl method (except NO3)\nmg/l N\n1\n2\n3\n39\nAmmonia\nmg/l NH4\n0.05\n1\n1.5\n2\n4\n40\nSubstances extractable with chloroform\nmg/l SEC\n0.1\n0.2\n0.5\n43\nTotal coliforms 37°C\n/100 ml\n50\n5,000\n50,000\n44\nFaecal coliforms\n/100 ml\n20\n2,000\n20,000\n45\nFaecal streptococci\n/100 ml\n20\n1,000\n10,000\n46\nSalmonella\nNot Present in 5,000 ml\nNot Present in 1,000 ml",
  "extent": "N.I.",
  "status": "prospective",
  "version": "current",
  "annotations": [
    {
      "type": "I",
      "label": "I1",
      "text": "Sch. 1 in operation at 20.2.1997, see reg. 1"
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "(O) See regulation 6(1)(b)"
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "* See regulation 6(1)(d)"
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "(1) The values given are upper limits set in relation to the mean annual temperature (high and low)."
    },
    {
      "type": "footnote",
      "label": "f4",
      "text": "(2) This parameter has been included to satisfy the ecological requirements of certain types of environment."
    }
  ],
  "outstanding_effects": [
    {
      "type": "coming into force",
      "affecting": "nisr/1996/603",
      "affecting_title": "The Surface Waters (Abstraction for Drinking Water) (Classification) Regulations (Northern Ireland) 1996"
    }
  ],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/1996/603/schedule/1",
    "retrieved_at": "2026-10-29T02:31:40.185100+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."
}