{
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  "json_url": "https://openlegislation.uk/surface-waters-fishlife-classification-regulations-1997.json",
  "id": "uksi/1997/1331",
  "title": "The Surface Waters (Fishlife) (Classification) Regulations 1997",
  "short_title": "Surface Waters (Fishlife) (Classification) 1997",
  "long_title": "These Regulations prescribe a system for classifying the quality of inland freshwaters which need protection or improvement in order to support fish life.",
  "citation": "S.I. 1997/1331",
  "type": "uksi",
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      "number": "II",
      "heading": "ZINC CONCENTRATIONS (mg/l Zn) FOR DIFFERENT WATER HARDNESS VALUES BETWEEN 10 AND 500 mg/l CaCO3",
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      "id": "ukpga/1991/57",
      "title": "Water Resources Act 1991",
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    "source_url": "https://www.legislation.gov.uk/uksi/1997/1331",
    "retrieved_at": "2026-10-29T12:08:21.146177+00:00"
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  "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."
}