Tap water in BS21, North SomersetToo few tap tests to call it.
Supplied by Bristol Water. 8 substances, latest on 13 June 2019. These are river and groundwater samples near BS21, not tests of treated tap water, so treat the score as a rough guide.
9.0 / 10
The tank is as full as the score.
What to do about it
ZeroWater 12-Cup Ready-Pour
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Households concerned about PFAS and heavy metals
Waterdrop 10UA Under Sink
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High-volume under-sink filtration without RO complexity
BRITA Marella XL + MAXTRA PRO
£25typical price
Basic chlorine and taste improvement on a budget
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What's in a glass of BS21 water
Every bubble is a substance the lab measured. The higher it floats, the closer it came to its legal limit, the dashed line at the top.
Ammonia came closest to a limit, at 17% of it. 3 of 3 substances used under a quarter of theirs.
- Ammonia17%
- Nitrite10%
- Nitrate4%
- pH 7.57 pH
- Temperature 13.8 °C
- Conductivity 604 µS/cm
- Phosphate 0.02 mg/L
- Dissolved Oxygen 11 mg/L
All 8 results as a table
Your river is the Land Yeo - Yearling Ditch to mouth, rated moderate
The Environment Agency rated the Land Yeo - Yearling Ditch to mouth as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by dissolved oxygen and phosphate. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants. Its ecological rating has improved since the previous assessment.
None of this is a test of your tap water. Environment Agency record · River health across England
24
forever-chemical detections in nearby rivers and groundwater
At 1 site. The highest was PFPeA at 0.019 µg/L, at Wraxall Service Station Borehole, 7.2 km away, in April 2024. These are river and borehole samples, not tests of your tap water.
Every PFAS sample around Bristol · Which filters remove PFAS · PFAS explained
BS21 in short
Tap water in BS21 (North Somerset) is supplied by Bristol Water in the North Somerset Central zone and scores 9.0 out of 10, against an England and Wales average of 9.0. None of the 8 tested substances came close to a limit. The latest sample is from 13 June 2019.
- The newest sample here is from June 2019That is over 7 years old, so treat this page as a record of past results rather than today's tap water.
- 6th cleanest of 10 areas tested in BristolSquarely mid-table for Bristol, between BS40 on 9.6 and BS41 on 7.7. Every area in Bristol
- PFAS found at 1 monitoring site within 10 kmThose are river and groundwater samples, not tap water. The highest was PFPeA about 7.2 km away. What was measured
Questions about BS21 water
Is BS21 tap water safe to drink?
Based on the latest tests, BS21 (North Somerset) water scores 9/10, which is safe. 0 of 8 tested contaminants exceeded recommended levels. Water is supplied by Bristol Water.
What contaminants are in BS21 water?
We tested 8 contaminants in BS21 water. None exceeded recommended safe levels. PFAS (forever chemicals) were also measured in rivers and groundwater within 10 km, though not in the tap-water tests themselves.
Who supplies water in BS21?
BS21 (North Somerset) is supplied by Bristol Water. You can view their full profile and compliance data on our supplier page.
Should I use a water filter in BS21?
BS21 water scored 9/10 with no contaminants above recommended levels. A filter is optional but can improve taste, especially if you notice a chlorine flavour. See our filter recommendations for your area.
Are there PFAS forever chemicals in BS21 water?
The tap-water tests we hold for BS21 do not include a PFAS result. Environment Agency monitoring found PFAS in 24 river and groundwater samples from 1 sites within 10 km of BS21, the highest being PFPeA at 0.019 µg/L about 7.2 km away. These are environmental samples, not tests of tap water. The UK currently has no legal limit for PFAS in drinking water; the Drinking Water Inspectorate uses a 0.1 µg/L guideline for individual compounds. Reverse osmosis filters can reduce PFAS levels.
How clean is the river near BS21?
The Environment Agency rated the Land Yeo - Yearling Ditch to mouth as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by dissolved oxygen and phosphate. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants. Its ecological rating has improved since the previous assessment. This is a rating of the river, not of tap water in BS21, which is treated before it reaches homes.
Keep reading
- Best Filter for PFAS RemovalThe filters with independent certification to remove forever chemicals
- PFAS Forever ChemicalsWhat PFAS are and how to reduce your exposure at home
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
- Best Water Filters UKEvery filter type compared on what it actually removes
PFAS explainedHow to test your waterBest water filtersFilter shower headsWater testing kitsAll of BristolUK water rankingsWater hardness checkerWater hardness map
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