United Utilities Tap Water Quality Data

United Utilities supplies water to North West England. We have data for 4,503 supply zones, sourced from the Drinking Water Inspectorate via the Stream open data initiative.

What's actually in your tap water?

Latest available lab data for every UK postcode

Tap water quality by town

DWI lab results for nitrates, lead, chlorine and fluoride — browse all towns.

Browse towns →

Sewage spills by town

Environment Agency storm overflow counts and durations by town.

Browse towns →

water companies covered

100,000+

zones mapped

DWI

real lab data

Data sourced from the Drinking Water Inspectorate via the Stream open data initiative

New baby at home?

Nitrates, lead and formula — what parents need to know

Parents hub →

Dry skin or eczema?

Hard water and skin — the evidence

Skin & health hub →

Just bought a house?

What to check before you exchange

Homebuyers hub →