Tap water in BS41, North SomersetAmmonia is over the limit.
Supplied by Bristol Water. 12 substances, latest on 3 August 2026. Ammonia came in above the legal limit. Everything else passed.
7.7 / 10
The tank is as full as the score.
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What's in a glass of BS41 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 is over its legal limit, at 104% of it.
- Ammonia104%
- Nitrite16%
- Nitrate8%
- Lead<1%
- Copper<1%
- pH 7.99 pH
- Zinc 0.0018 mg/L
- Temperature 8.6 °C
- Conductivity 748 µS/cm
- Phosphate 0.038 mg/L
- Dissolved Oxygen 11.4 mg/L
All 12 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Ammonia | 0.518 mg/L | 0.5 mg/L | 104% |
| pH | 7.99 pH | No legal limit | – |
| Lead | 0.00001 mg/L | 0.01 mg/L | <1% |
| Hardness (as CaCO3) | 236 mg/L | No legal limit | – |
| Zinc | 0.0018 mg/L | No legal limit | – |
| Copper | 0.00002 mg/L | 2 mg/L | <1% |
| Temperature | 8.6 °C | No legal limit | – |
| Conductivity | 748 µS/cm | No legal limit | – |
| Nitrate | 4.24 mg/L | 50 mg/L | 8% |
| Nitrite | 0.0792 mg/L | 0.5 mg/L | 16% |
| Phosphate | 0.038 mg/L | No legal limit | – |
| Dissolved Oxygen | 11.4 mg/L | No legal limit | – |
Your river is the Land Yeo - source to Jacklands Bridge, rated moderate
The Environment Agency rated the Land Yeo - source to Jacklands Bridge as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by 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.
None of this is a test of your tap water. Environment Agency record · River health across England
110
forever-chemical detections in nearby rivers and groundwater
At 5 sites. The highest was PFOS at 0.023 µg/L, at Eastville Lake Inlet, 9.3 km away, in July 2023. These are river and borehole samples, not tests of your tap water.
Every PFAS sample around Bristol · Which filters remove PFAS · PFAS explained
BS41 in short
Tap water in BS41 (North Somerset) is supplied by Bristol Water in the North Somerset Central zone and scores 7.7 out of 10, against an England and Wales average of 9.0. 1 of 12 tested substances was close to or over a limit. The latest sample is from 3 August 2026.
- Ammonia was measured at 0.52 mg/L, 4% over the UK limitIt is the only one of 12 tested substances to go over its limit. See the full results
- The lowest score of the 10 areas tested in BristolBS41 scores 7.7 out of 10. The best in Bristol, BS40, scores 9.6. Every area in Bristol
- Every one of the 9 neighbouring districts scores higherBS40 next door scores 9.6, against 7.7 here. Supply zones, not distance, explain the gap. See BS40
Questions about BS41 water
Is BS41 tap water safe to drink?
Based on the latest tests, BS41 (North Somerset) water scores 7.7/10, which is safe. 1 of 12 tested contaminants exceeded recommended levels. Water is supplied by Bristol Water.
What contaminants are in BS41 water?
We tested 12 contaminants in BS41 water. 1 were flagged, including Ammonia. 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 BS41?
BS41 (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 BS41?
With 1 contaminant above recommended levels in BS41, a water filter could help. A reverse osmosis or activated carbon filter is recommended for PFAS removal. See our filter recommendations for your area.
Are there PFAS forever chemicals in BS41 water?
The tap-water tests we hold for BS41 do not include a PFAS result. Environment Agency monitoring found PFAS in 110 river and groundwater samples from 5 sites within 10 km of BS41, the highest being PFOS at 0.023 µg/L about 9.3 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 BS41?
The Environment Agency rated the Land Yeo - source to Jacklands Bridge as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by 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. This is a rating of the river, not of tap water in BS41, 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
- Best Water Filters UKEvery filter type compared on what it actually removes
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
PFAS explainedHow to test your waterBest water filtersFilter shower headsWater testing kitsAll of BristolUK water rankingsWater hardness checkerWater hardness map
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