{
 "version": "1.0.0",
 "asOf": "2026-09-11",
 "licence": "CC BY 4.0 (WaterGrade). Links and metadata only; no third-party measurement values.",
 "fields": [
  "register_id",
  "organisation",
  "role",
  "nation",
  "region",
  "publishes",
  "official_url",
  "additional_url",
  "additional_url_label",
  "how_to_find",
  "geography",
  "reporting_period",
  "hardness_unit_as_published",
  "watergrade_page",
  "watergrade_approved_reports",
  "watergrade_periods_held",
  "licence_status",
  "licence",
  "licence_record_id",
  "measurement_values_in_this_dataset",
  "checked_on"
 ],
 "records": [
  {
   "register_id": "dwi",
   "organisation": "Drinking Water Inspectorate (DWI)",
   "role": "regulator",
   "nation": "England and Wales",
   "region": "England and Wales",
   "publishes": "Annual “Drinking water” reports with company performance data; consumer guidance, including hardness bands",
   "official_url": "https://www.dwi.gov.uk/what-we-do/annual-report/drinking-water-2025/",
   "additional_url": "https://www.dwi.gov.uk/consumers/learn-more-about-your-water/water-hardness-hard-water/",
   "additional_url_label": "DWI hardness guidance",
   "how_to_find": "Use DWI for regulation, company-level performance and guidance. DWI directs households to their water company for local hardness.",
   "geography": "Company and national summaries",
   "reporting_period": "Calendar year",
   "hardness_unit_as_published": "Guidance bands in mg/l as CaCO₃",
   "watergrade_page": null,
   "watergrade_approved_reports": null,
   "watergrade_periods_held": null,
   "licence_status": "open-licence-verified",
   "licence": "Open Government Licence v3.0 (except where otherwise stated)",
   "licence_record_id": "dwi",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "dwqr",
   "organisation": "Drinking Water Quality Regulator for Scotland (DWQR)",
   "role": "regulator",
   "nation": "Scotland",
   "region": "Scotland",
   "publishes": "Annual reports on public and private water supplies, and how it checks Scottish Water’s sampling",
   "official_url": "https://dwqr.scot/information/annual-report/",
   "additional_url": "https://dwqr.scot/public-water-supply/",
   "additional_url_label": "Public water supply",
   "how_to_find": "Use DWQR for regulatory context. Local zone results come from Scottish Water.",
   "geography": "Scotland-wide and by supply",
   "reporting_period": "Calendar year",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": null,
   "watergrade_approved_reports": null,
   "watergrade_periods_held": null,
   "licence_status": "open-licence-verified",
   "licence": "Open Government Licence (logos excluded)",
   "licence_record_id": "dwqr",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "dwi-ni",
   "organisation": "Drinking Water Inspectorate for Northern Ireland (DAERA)",
   "role": "regulator",
   "nation": "Northern Ireland",
   "region": "Northern Ireland",
   "publishes": "Annual report on public and private drinking-water supplies in Northern Ireland",
   "official_url": "https://www.daera-ni.gov.uk/articles/duties-drinking-water-inspectorate-dwi",
   "additional_url": "https://www.daera-ni.gov.uk/news/drinking-water-inspectorate-publishes-2024-report",
   "additional_url_label": "2024 report announcement",
   "how_to_find": "NI Water is the public supplier; the Inspectorate regulates and reports on its results.",
   "geography": "Northern Ireland",
   "reporting_period": "Calendar year",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": null,
   "watergrade_approved_reports": null,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "dwi-ni",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "opendatani",
   "organisation": "OpenDataNI",
   "role": "open-data portal",
   "nation": "Northern Ireland",
   "region": "Northern Ireland",
   "publishes": "NI Water’s annual hardness by supply zone, customer-tap results, public registers and postcode-to-zone lookup",
   "official_url": "https://www.opendatani.gov.uk/@ni-water/ni-water-customer-tap-authorised-supply-point-results",
   "additional_url": "https://www.data.gov.uk/dataset/38a9a8f1-9346-41a2-8e5f-944d87d9caf2/ni-water-customer-tap-authorised-supply-point-results",
   "additional_url_label": "data.gov.uk record",
   "how_to_find": "Download the files for the year you need. These are NI Water’s own results, published through a government portal.",
   "geography": "Water supply zone; postcode lookup by year",
   "reporting_period": "Calendar year",
   "hardness_unit_as_published": "mg/l as CaCO₃",
   "watergrade_page": "https://watergrade.co.uk/water-company/northern-ireland-water",
   "watergrade_approved_reports": null,
   "watergrade_periods_held": null,
   "licence_status": "open-licence-verified",
   "licence": "Open Government Licence v3.0",
   "licence_record_id": "ni-water-opendatani",
   "measurement_values_in_this_dataset": "yes",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "stream",
   "organisation": "Stream",
   "role": "open-data portal",
   "nation": "England and Wales",
   "region": "Participating water companies",
   "publishes": "Water-industry open datasets. Some companies list domestic water-quality data here",
   "official_url": "https://www.streamwaterdata.co.uk/",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Check each dataset’s publisher, period, geography and licence before using it.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": null,
   "watergrade_approved_reports": null,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "stream",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "thames",
   "organisation": "Thames Water",
   "role": "water supplier",
   "nation": "England",
   "region": "London and the Thames Valley",
   "publishes": "Annual water-quality report (PDF) for each water supply zone, found by postcode",
   "official_url": "https://www.thameswater.co.uk/help/water-and-waste-help/water-quality",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Use the official postcode search to find your supply-area report. Check the year printed in the PDF and keep the source-area name when comparing editions.",
   "geography": "Water supply zone",
   "reporting_period": "Calendar year",
   "hardness_unit_as_published": "mg/l as CaCO₃",
   "watergrade_page": "https://watergrade.co.uk/water-company/thames-water",
   "watergrade_approved_reports": 316,
   "watergrade_periods_held": "2024 | 2025",
   "licence_status": "restricted",
   "licence": null,
   "licence_record_id": "thames-water",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "affinity",
   "organisation": "Affinity Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Parts of London, South East and eastern England",
   "publishes": "Annual water-quality report (PDF) for each supply zone, plus a postcode hardness and fluoride search",
   "official_url": "https://www.affinitywater.co.uk/water-quality-in-your-area",
   "additional_url": "https://www.affinitywater.co.uk/customerinformation",
   "additional_url_label": "Customer information",
   "how_to_find": "Look up your postcode and open the linked report. A live hardness summary and an annual PDF can describe different reporting periods, so check the dates before treating a difference as a trend.",
   "geography": "Water supply zone",
   "reporting_period": "Calendar year (the live summary can use a different period)",
   "hardness_unit_as_published": "mg CaCO₃/l",
   "watergrade_page": "https://watergrade.co.uk/water-company/affinity-water",
   "watergrade_approved_reports": 92,
   "watergrade_periods_held": "2025",
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "affinity-water",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "yorkshire",
   "organisation": "Yorkshire Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Yorkshire",
   "publishes": "Postcode tool linking to an annual water-supply-zone report (PDF)",
   "official_url": "https://www.yorkshirewater.com/your-water/water-hardness/",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Read the reporting year inside the PDF. A year embedded in a zone’s name can be different. Where total hardness is reported as mg Ca/l, our validated importer converts that hardness figure to mg/l as CaCO₃; it does not convert a separate calcium measurement into hardness.",
   "geography": "Water supply zone",
   "reporting_period": "Report year printed in the PDF; a year in a zone’s name can differ",
   "hardness_unit_as_published": "Total hardness as mg Ca/l (× 2.5 = mg/l as CaCO₃)",
   "watergrade_page": "https://watergrade.co.uk/water-company/yorkshire-water",
   "watergrade_approved_reports": 2,
   "watergrade_periods_held": "2024",
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "yorkshire-water",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "severn-trent",
   "organisation": "Severn Trent Water",
   "role": "water supplier",
   "nation": "England",
   "region": "The Midlands and adjoining areas",
   "publishes": "Postcode checker with selectable reporting windows and a typical hardness summary",
   "official_url": "https://www.stwater.co.uk/my-supply/water-quality/check-my-water-quality/",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Enter your postcode, select the reporting window and keep the zone name. WaterGrade retains the quality period separately from typical hardness when the supplier does not state a hardness sampling period.",
   "geography": "Water supply zone",
   "reporting_period": "Rolling window chosen in the checker; typical hardness period not stated",
   "hardness_unit_as_published": "French degrees (× 10 = mg/l as CaCO₃) in the typical summary",
   "watergrade_page": "https://watergrade.co.uk/water-company/severn-trent-water",
   "watergrade_approved_reports": 253,
   "watergrade_periods_held": "2024 | Rolling report 2025-07-01 to 2026-06-30; hardness period not stated | Rolling report 2025-08-01 to 2026-07-31; hardness period not stated",
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "severn-trent-water",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "united-utilities",
   "organisation": "United Utilities",
   "role": "water supplier",
   "nation": "England",
   "region": "North West England",
   "publishes": "Postcode water-quality report",
   "official_url": "https://www.unitedutilities.com/help-and-support/your-water-supply/",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Our selected reports use a rolling reporting window. Compare the stated dates and update labels; overlapping rolling reports are not independent annual trend points.",
   "geography": "Water supply zone",
   "reporting_period": "Rolling 12 months, updated weekly; the update date is not a sampling end date",
   "hardness_unit_as_published": "mg CaCO₃/l",
   "watergrade_page": "https://watergrade.co.uk/water-company/united-utilities",
   "watergrade_approved_reports": 7,
   "watergrade_periods_held": "Rolling 12 months; updated 2026-09-04",
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "united-utilities",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "wessex-water",
   "organisation": "Wessex Water",
   "role": "water supplier",
   "nation": "England",
   "region": "South West England",
   "publishes": "Postcode hardness result in several appliance units, linking to a fuller water-quality report (PDF)",
   "official_url": "https://www.wessexwater.co.uk/your-water/hardness-and-limescale",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Keep the full PDF’s quality year separate from any undated hardness summary. We retain those publications separately and do not infer hardness where the PDF omits it.",
   "geography": "Water supply zone",
   "reporting_period": "Quality PDF: calendar year; short hardness summary may be undated",
   "hardness_unit_as_published": "mg/l as CaCO₃ and appliance units",
   "watergrade_page": "https://watergrade.co.uk/water-company/wessex-water",
   "watergrade_approved_reports": 48,
   "watergrade_periods_held": "2025 | Reporting period not retained in the cached source",
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "wessex-water",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "scottish-water",
   "organisation": "Scottish Water",
   "role": "water supplier",
   "nation": "Scotland",
   "region": "Scotland",
   "publishes": "Postcode checker naming your supply zone; annual hardness tables and zone water-quality reports",
   "official_url": "https://www.scottishwater.co.uk/your-home/your-water/water-quality/water-quality",
   "additional_url": "https://www.scottishwater.co.uk/help-and-resources/document-hub/key-publications/water-quality",
   "additional_url_label": "Water-quality publications",
   "how_to_find": "Use the official postcode checker and note its “Site Name”. Search that exact name below. We keep differently named historical areas separate unless evidence establishes a connection.",
   "geography": "Named water supply zone (names can change between years)",
   "reporting_period": "Calendar year; hardness tables and quality reports are separate publications",
   "hardness_unit_as_published": "mg/l as CaCO₃, calculated by Scottish Water from calcium and magnesium",
   "watergrade_page": "https://watergrade.co.uk/water-company/scottish-water",
   "watergrade_approved_reports": 2556,
   "watergrade_periods_held": "2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025",
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "scottish-water",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "ni-water",
   "organisation": "Northern Ireland Water",
   "role": "water supplier",
   "nation": "Northern Ireland",
   "region": "Northern Ireland",
   "publishes": "Postcode results on its website; annual hardness by supply zone (PDF) and a postcode-to-zone lookup by year (CSV) on OpenDataNI",
   "official_url": "https://www.niwater.com/about-your-water/drinking-water/water-quality-results",
   "additional_url": "https://www.opendatani.gov.uk/@ni-water/ni-water-customer-tap-authorised-supply-point-results",
   "additional_url_label": "Open data files (OpenDataNI)",
   "how_to_find": "Our postcode lookup uses the supplier’s published annual mapping. Ambiguous matches stay ambiguous. Confirm your current supply with NI Water when arrangements have changed, and use its service-updates page for present-day notices.",
   "geography": "Water supply zone (zone code, e.g. ZN0102)",
   "reporting_period": "Calendar year",
   "hardness_unit_as_published": "mg/l as CaCO₃ (the table also gives other units)",
   "watergrade_page": "https://watergrade.co.uk/water-company/northern-ireland-water",
   "watergrade_approved_reports": 185,
   "watergrade_periods_held": "2023 | 2024 | 2025",
   "licence_status": "open-licence-verified",
   "licence": "Open Government Licence v3.0",
   "licence_record_id": "ni-water-opendatani",
   "measurement_values_in_this_dataset": "yes",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "anglian-water",
   "organisation": "Anglian Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Eastern England",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.anglianwater.co.uk/global-faq/where-can-i-find-the-drinking-water-report",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Search your postcode, then choose “I want a full Drinking Water Quality Report for this area”. Keep the zone name, report year and units. Until a validated import is available here, use that original result with our report-reading and conversion guides.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/anglian-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "welsh-water",
   "organisation": "Dŵr Cymru Welsh Water",
   "role": "water supplier",
   "nation": "Wales",
   "region": "Wales and adjoining English areas",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.dwrcymru.com/en/help-advice/drinking-water-quality/water-quality-in-the-home",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Enter your postcode in the supplier’s “In Your Area” service and open the water-quality information. Keep the annual report alongside its zone name; a moving-house or conveyancing search does not turn an area summary into a household test.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/welsh-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "southern-water",
   "organisation": "Southern Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Southern England",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.southernwater.co.uk/help-and-support/hard-water-checker-and-full-water-quality-report/",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Use the supplier’s hard-water checker and download the full report for your area. Read its date and units before applying the result to appliance settings. For a new supply problem, use the official problem-reporting route.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/southern-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "south-east-water",
   "organisation": "South East Water",
   "role": "water supplier",
   "nation": "England",
   "region": "South East England",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.southeastwater.co.uk/help/water-supply/water-quality/",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Enter your postcode on the official quality page. Match the local hardness number and unit to your appliance manual, and open the quality report for individual measurements and their reporting period.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/south-east-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "south-west-water",
   "organisation": "South West Water",
   "role": "water supplier",
   "nation": "England",
   "region": "South West England",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.southwestwater.co.uk/waterquality",
   "additional_url": "https://www.dwi.gov.uk/water-companies/improvement-programmes/south-west-water-improvement-programmes/",
   "additional_url_label": "DWI improvement programme",
   "how_to_find": "Enter your full postcode and compare the zone map, hardness information and report dates. Bristol has a separate guide here because customers use its named regional service and source-report routes.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/south-west-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "bristol-water",
   "organisation": "Bristol Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Bristol and surrounding supply areas",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.bristolwater.co.uk/your-water/water-quality-testing",
   "additional_url": "https://www.dwi.gov.uk/water-companies/improvement-programmes/south-west-water-improvement-programmes/",
   "additional_url_label": "DWI improvement programme (South West Water)",
   "how_to_find": "Start with the water-quality testing page and its local results route. Keep the supply-zone name and date from the report. We retain a separate Bristol guide rather than substituting results from another South West Water supply area.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/bristol-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "portsmouth-water",
   "organisation": "Portsmouth Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Portsmouth and surrounding supply areas",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.portsmouthwater.co.uk/about-us/water-quality/hardness-water-quality-results-in-your-area/",
   "additional_url": "https://www.portsmouthwater.co.uk/about-us/water-quality/",
   "additional_url_label": "Water-quality overview",
   "how_to_find": "Use the official local-results page for the supply zone and exact hardness needed by your appliance. A description of the company’s chalk sources cannot replace that local figure.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/portsmouth-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "ses-water",
   "organisation": "SES Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Parts of Surrey, Kent and south London",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.seswater.co.uk/household/your-water/water-quality",
   "additional_url": "https://www.seswater.co.uk/siteassets/documents/your-water/water-quality/water-in-your-home/ses-water-quality-pdf_water-hardness--limescale_jul26.pdf",
   "additional_url_label": "Water hardness and limescale factsheet (PDF)",
   "how_to_find": "Use the current postcode report and read any operational notes alongside the annual hardness table. Check whether the unit refers to calcium or calcium carbonate before converting it for your dishwasher.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/ses-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "south-staffs-water",
   "organisation": "South Staffs Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Staffordshire and the West Midlands",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.south-staffs-water.co.uk/household/my-water-supply/water-quality/",
   "additional_url": "https://www.south-staffs-water.co.uk/household/my-water-supply/water-quality/water-quality-standards/cannock-high-2-water-quality-zone-ch2",
   "additional_url_label": "Example zone report (Cannock High 2)",
   "how_to_find": "Open the water-quality standards and area-report section from the official quality page. Select the confirmed zone and retain the reporting year; a sample count or compliance statement applies only to that report’s scope.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/south-staffs-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "cambridge-water",
   "organisation": "Cambridge Water",
   "role": "water supplier",
   "nation": "England",
   "region": "Cambridge and surrounding supply areas",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.cambridge-water.co.uk/household/my-water-supply/water-quality/",
   "additional_url": null,
   "additional_url_label": null,
   "how_to_find": "Follow the water-quality standards and area-report route for measurements, and use the hardness section for limescale questions. Save the report’s date and units before comparing with another year or a home test.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/cambridge-water",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  },
  {
   "register_id": "hafren-dyfrdwy",
   "organisation": "Hafren Dyfrdwy",
   "role": "water supplier",
   "nation": "Wales",
   "region": "Mid and north-east Wales",
   "publishes": "Official postcode or area water-quality information",
   "official_url": "https://www.hdcymru.co.uk/my-services/water-quality/check-my-water-quality/",
   "additional_url": "https://www.hdcymru.co.uk/about-us/",
   "additional_url_label": "About the company",
   "how_to_find": "Enter your postcode and retain the selected reporting window and zone. Do not compare a monthly result with an annual figure as though both covered the same period.",
   "geography": "Not reviewed by WaterGrade",
   "reporting_period": "Not reviewed by WaterGrade",
   "hardness_unit_as_published": "Not reviewed by WaterGrade",
   "watergrade_page": "https://watergrade.co.uk/water-company/hafren-dyfrdwy",
   "watergrade_approved_reports": 0,
   "watergrade_periods_held": null,
   "licence_status": "not-verified",
   "licence": null,
   "licence_record_id": "other-suppliers",
   "measurement_values_in_this_dataset": "no",
   "checked_on": "2026-09-11"
  }
 ],
 "licenceRegister": [
  {
   "id": "watergrade-compilation",
   "source": "WaterGrade",
   "scope": "WaterGrade's own source register, column design, identifiers and notes",
   "status": "own-content",
   "licence": "CC BY 4.0",
   "licenceUrl": "https://creativecommons.org/licenses/by/4.0/",
   "evidenceUrl": "https://watergrade.co.uk/open-data",
   "finding": "WaterGrade's own compilation is released under CC BY 4.0. Third-party values keep their own licence, shown on each row.",
   "datasetUse": "values",
   "attribution": "WaterGrade (watergrade.co.uk/open-data), CC BY 4.0",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "ni-water-opendatani",
   "source": "Northern Ireland Water via OpenDataNI",
   "scope": "Annual water hardness by water supply zone (2023, 2024 and 2025 PDFs) in the dataset “Northern Ireland Water Drinking Water Quality Public Registers, Individual Customer Tap & Authorised Supply Point Results, & Drinking Water Quality Annual Reports”",
   "status": "open-licence-verified",
   "licence": "Open Government Licence v3.0",
   "licenceUrl": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
   "evidenceUrl": "https://www.opendatani.gov.uk/@ni-water/ni-water-customer-tap-authorised-supply-point-results",
   "finding": "The OpenDataNI catalogue record (license_id uk-ogl, “UK Open Government Licence (OGL)”, licence URL OGL v3.0) and its data.gov.uk copy both state the OGL. Checked through both catalogue APIs on 11 September 2026. The OGL permits copying, publishing and adapting, including commercially, with attribution.",
   "datasetUse": "values",
   "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: Northern Ireland Water, water hardness by water supply zone, published on OpenDataNI.",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "dwi",
   "source": "Drinking Water Inspectorate (England and Wales)",
   "scope": "Guidance pages and annual reports",
   "status": "open-licence-verified",
   "licence": "Open Government Licence v3.0 (except where otherwise stated)",
   "licenceUrl": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
   "evidenceUrl": "https://www.dwi.gov.uk/",
   "finding": "Site footer: all content available under the OGL v3.0 except where otherwise stated. The dataset only links to DWI pages; it copies no DWI figures.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "dwqr",
   "source": "Drinking Water Quality Regulator for Scotland",
   "scope": "Regulator website and annual reports",
   "status": "open-licence-verified",
   "licence": "Open Government Licence (logos excluded)",
   "licenceUrl": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
   "evidenceUrl": "https://dwqr.scot/copyright/",
   "finding": "Copyright page permits re-use under the OGL, excluding DWQR logos. This covers regulator content, not Scottish Water's own zone data. Links only.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "dwi-ni",
   "source": "Drinking Water Inspectorate for Northern Ireland (DAERA)",
   "scope": "Regulator pages and annual reports",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.daera-ni.gov.uk/articles/duties-drinking-water-inspectorate-dwi",
   "finding": "Reuse terms not checked. Links only.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "thames-water",
   "source": "Thames Water",
   "scope": "Website content, water-quality reports and postcode results",
   "status": "restricted",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.thameswater.co.uk/legal/terms-and-conditions",
   "finding": "Website terms: content may not be copied or incorporated into any other website, retrieval system or publication without prior written consent or in accordance with the Copyright, Designs and Patents Act 1998 (personal, non-commercial download only). No Thames values in the dataset; links only. Owner decision 12 covers a permission request.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "scottish-water",
   "source": "Scottish Water",
   "scope": "Annual hardness tables and zone water-quality reports",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.scottishwater.co.uk/help-and-resources/document-hub/key-publications/water-quality",
   "finding": "Terms pages returned HTTP 403 to an automated read-only request on 11 September 2026, so no licence was confirmed. WaterGrade holds approved Scottish reports, but no Scottish Water values are in the dataset.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "affinity-water",
   "source": "Affinity Water",
   "scope": "Affinity Water website reports and postcode results",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.affinitywater.co.uk/water-quality-in-your-area",
   "finding": "Website or data reuse terms not yet checked. WaterGrade holds approved Affinity reports. Measurement values are excluded from the open dataset until a licence permitting redistribution is confirmed.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "yorkshire-water",
   "source": "Yorkshire Water",
   "scope": "Yorkshire Water website reports and postcode results",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.yorkshirewater.com/your-water/water-hardness/",
   "finding": "Website or data reuse terms not yet checked. WaterGrade holds approved Yorkshire reports. Measurement values are excluded from the open dataset until a licence permitting redistribution is confirmed.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "severn-trent-water",
   "source": "Severn Trent Water",
   "scope": "Severn Trent Water website reports and postcode results",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.stwater.co.uk/my-supply/water-quality/check-my-water-quality/",
   "finding": "Website or data reuse terms not yet checked. WaterGrade holds approved Severn Trent reports. Measurement values are excluded from the open dataset until a licence permitting redistribution is confirmed.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "united-utilities",
   "source": "United Utilities",
   "scope": "United Utilities website reports and postcode results",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.unitedutilities.com/help-and-support/your-water-supply/",
   "finding": "Website or data reuse terms not yet checked. WaterGrade holds approved United Utilities reports. Measurement values are excluded from the open dataset until a licence permitting redistribution is confirmed.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "wessex-water",
   "source": "Wessex Water",
   "scope": "Wessex Water website reports and postcode results",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.wessexwater.co.uk/your-water/hardness-and-limescale",
   "finding": "Website or data reuse terms not yet checked. WaterGrade holds approved Wessex reports. Measurement values are excluded from the open dataset until a licence permitting redistribution is confirmed.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "other-suppliers",
   "source": "Other UK water suppliers listed in the source register",
   "scope": "Official lookup and report pages",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://watergrade.co.uk/water-companies",
   "finding": "WaterGrade holds no approved measurements from these suppliers. The register only names them and links to their public pages.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "stream",
   "source": "Stream (water industry open-data portal)",
   "scope": "Industry open datasets",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://www.streamwaterdata.co.uk/",
   "finding": "The portal needs JavaScript and its dataset licences were not readable in a plain request. Listed as a place to look; no Stream data is used.",
   "datasetUse": "links-only",
   "checkedOn": "2026-09-11"
  },
  {
   "id": "postcode-geography",
   "source": "postcodes.io / ONS Postcode Directory",
   "scope": "Postcode locations used by the website map",
   "status": "not-verified",
   "licence": null,
   "licenceUrl": null,
   "evidenceUrl": "https://postcodes.io/docs/licences/",
   "finding": "Used by the website only. The open dataset contains no postcodes and no postcode-to-zone lookup.",
   "datasetUse": "not-used",
   "checkedOn": "2026-09-11"
  }
 ]
}