Severn Trent supplies Derby from the Derwent Valley reservoirs, which also supply much of the East Midlands.
According to TapWater.uk's analysis, Derby scores 9.1/10 for drinking water quality in 2026. Water is supplied by Severn Trent and has been tested for 19 contaminants across 10 postcode districts.
Average score
9.1/10
UK avg: 9.0/10
Areas tested
10
Issues flagged
0
PFAS detected
None
Yes, Derby tap water is safe to drink. Based on 10 areas tested, Derby has an average water quality score of 9.1/10 (level with the UK average of 9.0/10). No contaminants were found above recommended levels. Water is supplied by Severn Trent. Severn Trent supplies Derby from the Derwent Valley reservoirs, which also supply much of the East Midlands.
All postcode districts in Derby, ranked by water quality score.
Areas to watch
Learn more about the water quality issues relevant to this area.
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Yes, Derby tap water is generally safe to drink. Across 10 areas tested, the average water quality score is 9.1/10. Severn Trent supplies Derby from the Derwent Valley reservoirs, which also supply much of the East Midlands.
Yes, you can drink tap water in Derby. It is regulated to UK drinking water standards, and across 10 tested areas the average water quality score is 9.1/10. Enter your postcode for the readings in your exact area.
No contaminants were flagged above recommended levels across Derby. All tested areas passed on the parameters measured.
Water in Derby has an average hardness of 233 mg/L CaCO₃, which is classified as hard. Hard water causes limescale buildup in kettles and appliances. A water softener or filter may help.
The areas with the best water quality in Derby are DE1 (9.4/10), DE21 (9.4/10), DE5 (9.3/10).
Water in Derby is supplied by Severn Trent. Severn Trent supplies Derby from the Derwent Valley reservoirs, which also supply much of the East Midlands.
No PFAS (forever chemicals) have been detected in any of the 10 areas tested in Derby.
Free live water quality widget for DE1: 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 Derby.