Locate the postcode
The full postcode is sent to Postcodes.io, which returns an approximate point derived from open postcode data. We do not store the postcode or put it in a page URL.
Our checking method
How we check restriction information
We combine open postcode coordinates, official analytical supply zones and dated water-company notices. The result remains an estimate until the property’s supplier is confirmed.
Compare supply boundaries
The point is compared locally with Environment Agency Water Resource Zones, revised 2025-10-08. Suppliers within 750 metres of a boundary remain possible candidates.
Check restriction sources
Water-company notices provide the restriction status. Water UK’s national overview is a cross-check; a conflict stays visible instead of being normalised away.
Keep the limits visible
The restriction snapshot was reviewed 27 July 2026 and expires 31 July 2026. Multiple suppliers, partial bans, missing data and failed lookups never become a definitive answer.
Result contract
What each answer can — and cannot — mean
- Likely affected
- One likely supplier contains the postcode point and reports a restriction across its whole supply area.
- Several suppliers possible
- The postcode point is close to or overlaps an analytical boundary, so every candidate and its status is displayed.
- No restriction found
- The likely supplier was not in the dated national restriction register. This remains an estimate, not a legal assurance.
- Cannot complete
- Failed postcode services, expired restriction sources and unmatched boundaries return no yes-or-no conclusion.
Privacy
We do not keep your postcode
- No postcode in the page URL
- Postcode sent to Postcodes.io for an approximate point
- No account or alert capture in this version
- Privacy-first, aggregate page-view analytics from Cloudflare; no postcode or checker answer is included
- No postcode stored by the checker
Need to confirm the supplier first? Use the independent industry lookup, then check the restriction directly with that company.