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Sources and method for UK water data

Every figure on our UK pages comes from a published source: a regulator, a government body, a water company or another named publisher. Below are the sources and their editions, publication, update and read dates where recorded, with licences where the publishers state them.

How we use these sources

  • Each figure on our UK pages names its source and the period it covers, beside the figure.
  • Where a source does not cover a place, the page says so. We do not fill a gap with a neighbouring area's figure or an average.
  • Water companies, regulators and government bodies publish on different timetables, so each source below carries its own edition and dates.
  • The share of older homes on our lead pages is an estimate from council-tax records, not a test of any pipe.

Sources

Postcodes and water supply areas

Drinking water test results

Water hardness

Storm overflows

Older homes and lead pipes

Fluoride

Drought

Hosepipe bans and statutory notices

PFAS

Private water supplies

Water softener costs

  • Energy Saving Trust ↗Edition: At Home with Water, July 2013, p. 8 (PDF page 8). Read 13 October 2026.
  • BWT UK ↗Edition: BWT-GD 03-50001 / Rev. 1.02 - EN / January 2012, p. 2. Read 13 October 2026.
  • Drinking Water Inspectorate ↗Edition: Undated consumer page, Table 1; checked 13 October 2026. Read 13 October 2026. Licence: Open Government Licence v3.0 (page footer).
  • Dualit ↗Edition: Undated manufacturer guidance; checked 13 October 2026. Read 13 October 2026.
  • Wickes ↗Edition: Live retail listing checked 13 October 2026; single bag, excluding delivery. Read 13 October 2026.
  • Wickes ↗Edition: Terms and Conditions, Price and Payment; checked 13 October 2026. Read 13 October 2026.
  • Plumb2U ↗Edition: Live VAT-inclusive catalogue checked 13 October 2026. Read 13 October 2026.
  • Wickes ↗Edition: Live retail listing checked 13 October 2026; out of stock. Read 13 October 2026.
  • C A Waters Plumbing & Heating ↗Edition: Undated installer packages, checked 13 October 2026; Hertfordshire, subject to survey. Read 13 October 2026.

Guidance quoted on our answer pages

Contains public sector information licensed under the Open Government Licence v3.0.

By TapWaterData Editorial

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