{
  "url": "https://openlegislation.uk/surface-waters-abstraction-for-drinking-water-classification-scotland-regulations-1996/schedule-2",
  "json_url": "https://openlegislation.uk/surface-waters-abstraction-for-drinking-water-classification-scotland-regulations-1996/schedule-2.json",
  "legislation": "uksi/1996/3047",
  "legislation_title": "The Surface Waters (Abstraction for Drinking Water) (Classification) (Scotland) Regulations 1996",
  "legislation_url": "https://openlegislation.uk/surface-waters-abstraction-for-drinking-water-classification-scotland-regulations-1996",
  "path": "schedule/2",
  "kind": "schedule",
  "number": "2",
  "heading": "GUIDELINE VALUES",
  "text": "No in Annex II to 75/440/EEC\nParameters\nDW1\nDW2\nDW3\n1The value given is an upper limit set in relation to the mean annual temperature (high and low).\n2This parameter has been included to satisfy the ecological requirements of certain types of environment.\n*See regulation 8(1)(c)\n1\npH\n6.5 to 8.5\n5.5 to 9\n5.5 to 9\n2\nColoration (after simple filtration)\nmg/1 Pt Scale\n10\n50\n50\n3\nTotal suspended solids\nmg/1 SS\n25\n4\nTemperature\n°C\n22\n22\n22\n5\nConductivity at 20°C\nμs/cm\n1000\n1000\n1000\n6\nOdour\ndilution factor at 25°C\n3\n10\n20\n7\nNitrates\nmg/1 NO3\n25\n8\nFluorides\nmg/1 F\n0.7 to 1\n0.7 to 1.7\n0.7 to 1.7\n10\nDissolved iron\nmg/1 Fe\n0.1\n1\n1\n11\nManganese\nmg/1 Mn\n0.05\n0.1\n1\n12\nCopper\nmg/1 Cu\n0.02\n0.05\n1\n13\nZinc\nmg/1 Zn\n0.5\n1\n1\n14\nBoron\nmg/1 B\n1\n1\n1\n19\nArsenic\nmg/1 As\n0.01\n0.05\n20\nCadmium\nmg/1 Cd\n0.001\n0.001\n0.001\n24\nMercury\nmg/1 Hg\n0.0005\n0.0005\n0.0005\n27\nSulphates\nmg/1 SO4\n150\n150\n150\n28\nChlorides\nmg/1 Cl\n200\n200\n200\n29\nSurfactants (reacting with methyl blue)\nmg/1 (laurylsulphate)\n0.2\n0.2\n0.5\n30\nPhosphates\nmg/1 P2O5\n0.4\n0.7\n0.7\n31\nPhenols (phenol index) paranitroaniline 4-aminoantipyrine\nmg/1 C6H5OH\n0.001\n0.01\n32\nDissolved or emulsified hydro carbons (after extraction by petroleum ether)\nmg/1\n0.5\n35\nChemical oxygen demand (COD)\nmg/1 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/1 O2\n<3\n<5\n<7\n38\nNitrogen Kjeldahl method (except NO3)\nmg/1 N\n1\n2\n3\n39\nAmmonia\nmg/1 NH4\n0.05\n1\n2\n40\nSubstances extractable with chloroform\nmg/1 SEC\n0.1\n0.2\n0.5\n43\nTotal coliforms 37°C\n/100ml\n50\n5,000\n50,000\n44\nFaecal coliforms\n/100ml\n20\n2,000\n20,000\n45\nFaecal streptococci\n/100ml\n20\n1,000\n10,000\n46\nSalmonella\nNot present in 5,000ml\nNot present in 1,000ml",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "*See regulation 8(1)(c)"
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "1The value given is an upper limit set in relation to the mean annual temperature (high and low)."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "2This parameter has been included to satisfy the ecological requirements of certain types of environment."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1996/3047/schedule/2",
    "retrieved_at": "2026-10-29T12:30:44.273061+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."
}