{
  "url": "https://openlegislation.uk/urban-waste-water-treatment-scotland-regulations-1994/schedule-3/part-I/paragraph-5",
  "json_url": "https://openlegislation.uk/urban-waste-water-treatment-scotland-regulations-1994/schedule-3/part-I/paragraph-5.json",
  "legislation": "uksi/1994/2842",
  "legislation_title": "The Urban Waste Water Treatment (Scotland) Regulations 1994",
  "legislation_url": "https://openlegislation.uk/urban-waste-water-treatment-scotland-regulations-1994",
  "path": "schedule/3/part/I/paragraph/5",
  "kind": "paragraph",
  "number": "5",
  "heading": null,
  "text": "The points of discharge of urban waste water shall be chosen, as far as possible, so as to minimise the effects on receiving waters.\nTABLE 1\nREQUIREMENTS FOR DISCHARGES FROM URBAN WASTE WATER TREATMENT PLANTS SUBJECT TO REGULATION 5(1) AND (2)\nThe values for concentration or for the percentage of reduction shall apply.\nParameters\nConcentration\nMinimum percentage of reduction\nReference method of measurement\nAnalyses concerning discharges from lagooning shall be carried out on filtered samples; however, the concentration of total suspended solids in unfiltered water samples shall not exceed 150 mg/l.\nBiochemical oxygen demand (BOD5 at 20°C) without nitrification\n25 mg/1 O2\n70-90\nHomogenized, unfiltered, undecanted sample. Determination of dissolved oxygen before and after five-day incubation at 20°C ± 1°C, in complete darkness. Addition of a nitrification inhibitor.\nChemical oxygen demand (COD)\n125 mg/1 O2\n75\nHomogenized, unfiltered, undecanted sample Potassium dichromate.\nTABLE 2\nREQUIREMENTS FOR DISCHARGES FROM URBAN WASTE WATER TREATMENT PLANTS TO SENSITIVE AREAS WHICH ARE SUBJECT TO EUTROPHICATION AS IDENTIFIED IN SUB-PARAGRAPH (a) OF PART I OF SCHEDULE 1\nOne or both parameters may be applied depending on the local situation.The values for concentration or for the percentage of reduction shall apply.\nParameters\nConcentration\nMinimum percentage of reduction\nReference method of measurement\n(1)Reduction in relation to the load of the influent.\n(2)Total nitrogen means: the sum of total Kjeldahl-nitrogen (organic N+NH3), nitrate (NO3)-nitrogen and nitrite (NO2)-nitrogen.\nTotal phosphorus\n2 mg/1 P (10,000–100,000 p.e.) 1mg/1 P (more than 100,000 p.e.)\n80\nMolecular absorption spectrophotometry\nTotal nitrogen\n15 mg/1 N (10,000–100,000 p.e.) 10 mg/1 N (more than 100,000 p.e.)\n70-80\nMolecular absorption spectrophotometry",
  "extent": "S",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "I",
      "label": "I1",
      "text": "Sch. 3 Pt. I para. 5 in force at 30.11.1994, see reg. 1"
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "(1)Reduction in relation to the load of the influent."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "(2)Total nitrogen means: the sum of total Kjeldahl-nitrogen (organic N+NH3), nitrate (NO3)-nitrogen and nitrite (NO2)-nitrogen."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1994/2842/schedule/3/part/I/paragraph/5",
    "retrieved_at": "2026-10-29T13:23:41.288145+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."
}