Official open geography
The postcode and supplier stages use open, attributable geographic data.
Know your water
What reaches your tap?
Enter your postcode to identify your water supplier and supply area across England and Wales, with verified hardness and DWI regulatory information where available.
No invented hardness
A supplier match never becomes an exact hardness claim without a suitable source.
Built for postcode edges
Coordinate-to-polygon matching is more precise than assigning suppliers by postcode prefix.
What comes next
Add exact hardness, one licensed source at a time
The data model is ready to attach company water-quality zones and hardness values without changing the customer journey.