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Dŵr Cymru Welsh Water

Water quality report — Wales

-1/10

Average score

Very Poor

CF10

Lowest scored area

-1/10

SA2

Highest scored area

-1/10

0

Contaminants flagged

across all areas

Water Quality Across Dŵr Cymru Welsh Water Area

Scores sorted by lowest first — worst quality at the top.

PostcodeAreaScoreStatus
CF10Cardiff-1/10Very Poor
CF11Cardiff-1/10Very Poor
CF14Cardiff-1/10Very Poor
SA1Swansea-1/10Very Poor
SA2Swansea-1/10Very Poor

Postcode Areas Served

All postcode districts within Dŵr Cymru Welsh Water's supply network.

CF10Cardiff-1CF11Cardiff-1CF14Cardiff-1SA1Swansea-1SA2Swansea-1
Supplier compliance rates are sourced from the Drinking Water Inspectorate (DWI) annual reports. Postcode scores are calculated from Environment Agency monitoring data. See our methodology for full details.