About Water Directory
Coming soon
We're expanding this page with full data source details and who built it. Check your postcode below in the meantime.
Where the data comes from
Chemical readings — nitrates, lead, chlorine, fluoride, hardness — are from official Drinking Water Inspectorate (DWI) lab results, published via the Stream open data initiative. We are independent and not affiliated with any water company.
How the postcode lookup works
We use postcodes.io to map your postcode to a supply zone (LSOA). Each zone has lab results from your water supplier. For Northern Ireland we use Open Data NI. Sewage spill data is from the Environment Agency EDM dataset (England and Wales only).
Data sources
- Stream / streamwaterdata.co.uk — DWI chemical data
- postcodes.io — postcode to LSOA lookup
- Environment Agency EDM — sewage spill data