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 by UK postcode. Scores compare real drinking water tests from UK water companies and Environment Agency monitoring against the legal limits for 29 regulated contaminants.

2,241Areas covered

1704k+Water tests

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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.

DA9Dartford

Coliform Bacteria detected at 2 count/100ml

7.0/10

Dartford

E2Tower Hamlets

Coliform Bacteria detected at 1 count/100ml

7.0/10

Tower Hamlets

IG4Redbridge

Coliform Bacteria detected at 1 count/100ml

7.0/10

Redbridge

Cleanest water

These areas scored highest in our checks.

NE47Northumberland

No contaminants flagged — 21 tested

9.8/10

Northumberland

TS9North Yorkshire

No contaminants flagged — 8 tested

9.8/10

North Yorkshire

TN26Ashford

No contaminants flagged — 5 tested

9.8/10

Ashford

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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