Tap water in BS35, South GloucestershireToo few tap tests to call it.
Supplied by Bristol Water. 10 substances, latest on 3 August 2026. These are river and groundwater samples near BS35, not tests of treated tap water, so treat the score as a rough guide.
9.1 / 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
£70typical price
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 BS35 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.
Boron came closest to a limit, at 30% of it. 4 of 5 substances used under a quarter of theirs.
- Boron30%
- Ammonia16%
- Nitrate7%
- Nitrite3%
- Copper<1%
- Dissolved Oxygen 5.99 mg/L
- pH 7.66 pH
- Temperature 7.8 °C
- Conductivity 870 µS/cm
- Phosphate 0.18 mg/L
All 10 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Copper | 0.00091 mg/L | 2 mg/L | <1% |
| Boron | 0.3 mg/L | 1 mg/L | 30% |
| Dissolved Oxygen | 5.99 mg/L | No legal limit | – |
| pH | 7.66 pH | No legal limit | – |
| Temperature | 7.8 °C | No legal limit | – |
| Conductivity | 870 µS/cm | No legal limit | – |
| Ammonia | 0.081 mg/L | 0.5 mg/L | 16% |
| Nitrate | 3.3 mg/L | 50 mg/L | 7% |
| Nitrite | 0.0135 mg/L | 0.5 mg/L | 3% |
| Phosphate | 0.18 mg/L | No legal limit | – |
Your river is the Oldbury Naite Rhine, rated moderate
The Environment Agency rated the Oldbury Naite Rhine as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae 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.
None of this is a test of your tap water. Environment Agency record · River health across England
27
forever-chemical detections in nearby rivers and groundwater
At 2 sites. The highest was PFHxA at 0.0088 µg/L, at Adjacent to Somerby Close - Trib of Stoke Brook, 7.6 km away, in May 2025. These are river and borehole samples, not tests of your tap water.
Every PFAS sample around Bristol · Which filters remove PFAS · PFAS explained
BS35 in short
Tap water in BS35 (South Gloucestershire) is supplied by Bristol Water in the South Gloucestershire Central zone and scores 9.1 out of 10, against an England and Wales average of 9.0. None of the 10 tested substances came close to a limit. The latest sample is from 3 August 2026.
- 8th cleanest of 9 areas tested in South Gloucestershire1 area in South Gloucestershire scored lower. The best is BS37 on 9.6.
- PFAS found at 2 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was PFHxA about 7.6 km away. What was measured
- Nothing tested came within 40% of its legal limitThe highest was Boron at 30% of the 1 mg/L maximum. See every reading
Questions about BS35 water
Is BS35 tap water safe to drink?
Based on the latest tests, BS35 (South Gloucestershire) water scores 9.1/10, which is safe. 0 of 10 tested contaminants exceeded recommended levels. Water is supplied by Bristol Water.
What contaminants are in BS35 water?
We tested 10 contaminants in BS35 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 BS35?
BS35 (South Gloucestershire) 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 BS35?
BS35 water scored 9.1/10 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 BS35 water?
The tap-water tests we hold for BS35 do not include a PFAS result. Environment Agency monitoring found PFAS in 27 river and groundwater samples from 2 sites within 10 km of BS35, the highest being PFHxA at 0.0088 µg/L about 7.6 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 BS35?
The Environment Agency rated the Oldbury Naite Rhine as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae 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. This is a rating of the river, not of tap water in BS35, 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 kitsUK water rankingsWater hardness checkerWater hardness map
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