{
  "url": "https://openlegislation.uk/public-water-supplies-scotland-regulations-2014/schedule-1",
  "json_url": "https://openlegislation.uk/public-water-supplies-scotland-regulations-2014/schedule-1.json",
  "legislation": "ssi/2014/364",
  "legislation_title": "The Public Water Supplies (Scotland) Regulations 2014",
  "legislation_url": "https://openlegislation.uk/public-water-supplies-scotland-regulations-2014",
  "path": "schedule/1",
  "kind": "schedule",
  "number": "1",
  "heading": "PRESCRIBED CONCENTRATIONS AND VALUES",
  "text": "TABLE A\nMICROBIOLOGICAL PARAMETERS\n1 The parametric values in Part 2 are not required to protect human health (since the parametric values in Part 1 are sufficient for that purpose). The values in Part 2 are not therefore set for the purposes of Article 5(3) of the Directive.\n2 Compliance required as to 95% of samples from each service reservoir (regulation 4(4)).\n(1)Item\n(2)Parameter\n(3)Concentration orvalue (maximum)\n(4)Units ofmeasurement\n(5)Point ofcompliance\nPart 1\n1.\nEnterococci\n0\nNumber/100ml\nConsumer's tap\n2.\nEscherichia coli\n0\nNumber/100ml\nConsumer's tap\nPart 21\n3.\nColiform bacteria\n0\nNumber/100ml\nService reservoir2\n0\nNumber/100ml\nTreatment works\n4.\nEscherichia coli\n0\nNumber/100ml\nService reservoir\n0\nNumber/100ml\nTreatment works\nNotes—\nTABLE B\nCHEMICAL PARAMETERS\n(1)\n(2)\n(3)\n(4)\n(5)\n(6)\nNotes—\nNote 1: The parametric value of 0.10 μg/l refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water.\nNote 2: A parametric value of 2.4 mgB/l must be applied when desalinated water is the predominant water source of the supply system concerned or in regions where geological conditions could lead to high levels of boron in groundwater.\nNote 3: A parametric value of 0.70 mg/l must be applied where a disinfection method that generates this parameter, in particular chlorine dioxide, is used for disinfection of water intended for human consumption. This parametric value applies only if such disinfection methods are used.\nNote 4: This parameter must be measured only when disinfection methods that can generate HAAs are used for the disinfection of water intended for human consumption.\nNote 5: This parameter must be measured only in the event of potential blooms in source water (increasing cyanobacterial cell density or bloom forming potential).\nNote 6: See also regulation 4(2)(c).\nNote 7: The corresponding parametric value applies to each “other pesticide” individually.\nNote 8: A parametric value of 30 μg/l must be applied for regions where geological conditions could lead to high levels of selenium in groundwater.\nNote 9: The sum of concentrations of these two parameters.\nNote 10: The parametric value of 0.50 μg/l refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water.\nItem\nParameter\nConcentrat-ion or value (maximum)\nUnits of measurement\nPoint of compliance\nNotes\nPart 1\n1.\nAcrylamide\n0.10\nμg/l\nConsumer’s tap\nNote 1\n2.\nAntimony\n10\nμgSb/l\nConsumer’s tap\n3.\nArsenic\n10\nμgAs/l\nConsumer’s tap\n4.\nBenzene\n1.0\nμg/l\nConsumer’s tap\n5.\nBenzo(a)pyrene\n0.010\nμg/l\nConsumer’s tap\n6.\nBisphenol A\n2.5\nμg/l\nConsumer’s tap\n7.\nBoron\n1.5\nmgB/l\nConsumer’s tap\nNote 2\n8.\nBromate\n10\nμgBrO3/l\nConsumer’s tap\n9.\nCadmium\n5.0\nμgCd/l\nConsumer’s tap\n10.\nChlorate\n0.25\nmg/l\nConsumer’s tap\nNote 3\n11.\nChlorite\n0.25\nmg/l\nConsumer’s tap\nNote 3\n12.\nChromium\n50\nμgCr/l\nConsumer’s tap\n13.\nCopper\n2.0\nmgCu/l\nConsumer’s tap\n14.\nCyanide\n50\nμgCN/l\nConsumer’s tap\n15.\n1,2-dichloroethane\n3.0\nμg/l\nConsumer’s tap\n16.\nEpichlorohydrin\n0.10\nμg/l\nConsumer’s tap\nNote 1\n17.\nFluoride\n1.5\nmgF/l\nConsumer’s tap\n18.\nHAAs\n60\nμg/l\nConsumer’s tap\nNote 4\n19.\nLead\n10\nμgPb/l\nConsumer’s tap\n20.\nMercury\n1.0\nμgHg/l\nConsumer’s tap\n21.\nMicrocystin-LR\n1.0\nμg/l\nConsumer’s tap\nNote 5\n22.\nNickel\n20\nμgNi/l\nConsumer’s tap\n23.\nNitrate\n50\nmgNO3/l\nConsumer’s tap\nNote 6\n24.\nNitrite\n0.50\nmgNO2/l\nConsumer’s tap\nNote 6\n0.10\nmgNO2/l\nTreatment works\n25.\nPesticides—\nAldrin\n0.030\nμg/l\nConsumer’s tap\nDieldrin\n0.030\nμg/l\nConsumer’s tap\nHeptachlor\n0.030\nμg/l\nConsumer’s tap\nHeptachlor epoxide\n0.030\nμg/l\nConsumers’ tap\nOther pesticide\n0.10\nμg/l\nConsumer’s tap\nNote 7\n26.\nPesticides: total\n0.50\nμg/l\nConsumer’s tap\n27.\nSum of PFAS\n0.1\nμg/l\nConsumer’s tap\n28.\nPAH Total\n0.10\nμg/l\nConsumer’s tap\n29.\nSelenium\n20\nμgSe/l\nConsumer’s tap\nNote 8\n30.\nTetrachloroethene and trichloroethene\n10\nμg/l\nConsumer’s tap\nNote 9\n31.\nTHM: Total\n100\nμg/l\nConsumer’s tap\n32.\nUranium\n30\nμg/l\nConsumer’s tap\n33.\nVinyl chloride\n0.50\nμg/l\nNote 10\nPart 2\n34.\nAluminium\n200\nμgAl/l\nConsumer’s tap\n35.\nColour\n20\nmg/1 Pt/Co\nConsumer’s tap\n36.\nIron\n200\nμgFe/l\nConsumer’s tap\n37.\nManganese\n50\nμgMn/l\nConsumer’s tap\n38.\nSodium\n200\nmgNa/1\nConsumer’s tap\n39.\nTetrachlorometh-ane\n3\nμg/l\nConsumer’s tap\n40.\nTurbidity\n4\nNTU\nConsumer’s tap\nTABLE C\nIndicator Parameters\n(1)\n(2)\n(3)\n(4)\n(5)\n(6)\nNotes—\nNote 1: Water must not be aggressive or corrosive. This applies particularly to water undergoing treatment (demineralisation, softening, membrane treatment, reverse osmosis, etc.).\nNote 2: Where water intended for human consumption is derived from treatment that significantly demineralises or softens water, calcium and magnesium salts could be added to condition the water in order to reduce any possible negative health impact, as well as to reduce the corrosiveness or aggressivity of water and to improve taste. Minimum concentrations of calcium and magnesium or total dissolved solids in softened or demineralised water could be established taking into account the characteristics of water that enters those processes.\nNote 3: The water must not be corrosive.\nNote 4: This parameter must be measured if a risk assessment under regulation 30(2) indicates that it is appropriate to do so.\nNote 5: For water put into bottles or containers (which is not intended for sale for drinking by humans), the unit is number/250ml.\nNote 6: The water must not be aggressive.\nNote 7: For water put into bottles or containers (which is not intended for sale for drinking by humans), the minimum value is 4.5 pH units.\nNote 8: This parameter need not be measured for supplies of less than 10,000 m³ a day.\nNote 9: Remedial action is to be deemed justified on radiological protection grounds, without further consideration where radon concentrations exceed 1,000 Bq/l.\nNote 10: If the concentration of tritium exceeds this value, an analysis of the presence of other artificial radionuclides must also be carried out by Scottish Water.\nItem\nParameter\nConcentration or value (maximum) or state\nUnits of measurement\nPoint of monitoring\nNotes\nPart 1\n1.\nAmmonium\n0.50\nmgNH4/1\nConsumer’s tap\n2.\nChloride\n250\nmgCl/1\nSupply point\nNote 3\n3.\nClostridium perfringens (including spores)\n0\nNumber/100ml\nSupply point\nNote 4\n4.\nColiform bacteria\n0\nNumber/100ml\nConsumer’s tap\nNote 5\n5.\nColony count\nNo abnormal change\nNumber/1ml at 22°C\nConsumer’s tap, service reservoir and treatment works\n6.\nColour\nAcceptable to consumers and no abnormal change\nConsumer’s tap\n7.\nConductivity\n2500\nμS/cm at 20°C\nSupply point\nNote 6\n8.\nHydrogen ion\n9.5\npH value\nConsumer’s tap\nNotes 6 and 7\n6.5 (minimum)\n9.\nOdour\nAcceptable to consumers and no abnormal change\nConsumer’s tap\n10.\nSulphate\n250\nmgSO4/l\nSupply point\nNote 3\n11.\nTaste\nAcceptable to consumers and no abnormal change\nConsumer’s tap\n12.\nTotal organic carbon\nNo abnormal change\nmgC/1\nSupply point\nNote 8\n13.\nTurbidity\n1\nNTU\nTreatment works\nPart 2\n14.\nIndicative dose\n0.10\nmSv\nSupply point\n15.\nRadon\n100\nBq/l\nSupply point\nNote 9\n16.\nTritium\n100\nBq/l\nSupply point\nNote 10",
  "extent": "S",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Sch. 1 Table B and notes substituted (1.1.2023) by The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), reg. 1(1), sch. 1"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Sch. 1 Table C and notes substituted (1.1.2023) by The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), reg. 1(1), sch. 2"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/ssi/2014/364/schedule/1",
    "retrieved_at": "2026-10-28T21:32:08.441116+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."
}