What's in your tap water?

Free reports for every UK postcode, based on real drinking water tests.

Try your postcode — e.g. SW1A, M1, B1

Independent water quality reports for every UK postcode. Scores based on real drinking water tests from UK water companies and Environment Agency monitoring of 100+ contaminants.

2,245Areas covered

1620k+Water tests

1+PFAS alerts

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Water quality across the UK

Tap a region to explore water quality data for that area.

Areas to watch

These areas had the most issues in recent water tests.

DN8North Lincolnshire

Ammonia detected at 1.63 mg/L

5.3/10

North Lincolnshire

BS11Bristol, City of

Lead detected at 0.49 mg/L

5.6/10

Bristol, City of

BS9Bristol, City of

Lead detected at 0.1551 mg/L

5.6/10

Bristol, City of

Cleanest water

These areas scored highest in our checks.

CF30Cardiff

No contaminants flagged — 2 tested

10.0/10

Cardiff

S20Rotherham

No contaminants flagged — 2 tested

10.0/10

Rotherham

CH4Cheshire West and Chester

No contaminants flagged — 2 tested

10.0/10

Cheshire West and Chester

Water companies

We track data from all major UK water companies

Thames WaterLondon and Thames Valley15M customers Severn TrentMidlands8M customers United UtilitiesNorth West7M customers Yorkshire WaterYorkshire5M customers Anglian WaterEast of England4.5M customers Southern WaterSouth East4.7M customers

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What's in your tap water?

Water quality across the UK

Areas to watch

Cleanest water

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