Southern Water supplies Southampton from chalk aquifers in the Test Valley and river abstraction points.
According to TapWater.uk's analysis, Southampton scores 8.9/10 for drinking water quality in 2026. Water is supplied by Southern Water and has been tested for 23 contaminants across 9 postcode districts.
Average score
8.9/10
UK avg: 9.0/10
Areas tested
9
Issues flagged
4
PFAS detected
None
Yes, Southampton tap water is safe to drink. Based on 9 areas tested, Southampton has an average water quality score of 8.9/10 (below the UK average of 9.0/10). 4 contaminants were flagged above recommended levels across all areas. Water is supplied by Southern Water. Southern Water supplies Southampton from chalk aquifers in the Test Valley and river abstraction points.
Contaminants flagged most often across the city.
All postcode districts in Southampton, ranked by water quality score.
Learn more about the water quality issues relevant to this area.
Yes, Southampton tap water is generally safe to drink. Across 9 areas tested, the average water quality score is 8.9/10. Southern Water supplies Southampton from chalk aquifers in the Test Valley and river abstraction points.
Yes, you can drink tap water in Southampton. It is regulated to UK drinking water standards, and across 9 tested areas the average water quality score is 8.9/10. Enter your postcode for the readings in your exact area.
The most commonly flagged contaminants across Southampton are Nitrate (flagged in 2 areas), Lead (flagged in 2 areas). No PFAS were detected.
Hardness data is not yet available for Southampton. Enter your postcode for detailed water quality data.
The areas with the best water quality in Southampton are SO15 (9.2/10), SO14 (9.1/10), SO50 (9.1/10).
Water in Southampton is supplied by Southern Water. Southern Water supplies Southampton from chalk aquifers in the Test Valley and river abstraction points.
No PFAS (forever chemicals) have been detected in any of the 9 areas tested in Southampton.
Free live water quality widget for SO15: paste these two lines anywhere on your page. It stays up to date by itself and credits TapWater.uk automatically.
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<script src="https://www.tapwater.uk/widget.js" async></script>Get a detailed water quality report for your exact area in Southampton.