Tap water in TR5, CornwallSafe to drink.
Supplied by South West Water. 82 samples, 12 substances, latest on 3 December 2025. Everything is inside the legal limit, and nothing comes close to it.
9.5 / 10
The tank is as full as the score.
What to do about it
ZeroWater 12-Cup Ready-Pour
£40typical price
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 TR5 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.
Aluminium came closest to a limit, at 13% of it. 11 of 11 substances used under a quarter of theirs.
- Aluminium13%
- Nitrate12%
- Colour10%
- Arsenic6%
- Iron4%
- Turbidity3%
- Selenium3%
- Manganese3%
- Antimony2%
- Chromium2%
- Cadmium1%
- pH 7.9 pH
All 12 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Antimony | 0.0001 mg/L | 0.005 mg/L | 2% |
| Arsenic | 0.00062 mg/L | 0.01 mg/L | 6% |
| Cadmium | 0.00006 mg/L | 0.005 mg/L | 1% |
| Chromium | 0.0008 mg/L | 0.05 mg/L | 2% |
| Nitrate | 6.24 mg/L | 50 mg/L | 12% |
| Selenium | 0.0012 mg/L | 0.04 mg/L | 3% |
| Aluminium | 0.0257 mg/L | 0.2 mg/L | 13% |
| Colour | 2 mg/L Pt/Co | 20 mg/L Pt/Co | 10% |
| Iron | 0.0076 mg/L | 0.2 mg/L | 4% |
| Manganese | 0.00145 mg/L | 0.05 mg/L | 3% |
| pH | 7.9 pH | No legal limit | – |
| Turbidity | 0.13 NTU | 4 NTU | 3% |
Your coastal water is the Lands End to Trevose Head, rated good
The Environment Agency rated the Lands End to Trevose Head as good for ecological health in its 2025 assessment, meaning the coastal water is only slightly changed from its natural state. 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
TR5 in short
Tap water in TR5 (Cornwall) is supplied by South West Water in the Cornwall Central zone and scores 9.5 out of 10, against an England and Wales average of 9.0. None of the 12 tested substances came close to a limit. The latest sample is from 3 December 2025.
- 31st cleanest of 45 areas tested in Cornwall14 areas in Cornwall scored lower. The best is EX23 on 9.5.
- Nothing tested came within 40% of its legal limitThe highest was Aluminium at 13% of the 0.2 mg/L maximum. See every reading
- Scores higher than 1 of 10 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.
Questions about TR5 water
Is TR5 tap water safe to drink?
Based on the latest tests, TR5 (Cornwall) water scores 9.5/10, which is safe. 0 of 12 tested contaminants exceeded recommended levels. Water is supplied by South West Water.
What contaminants are in TR5 water?
We tested 12 contaminants in TR5 water. None exceeded recommended safe levels.
Who supplies water in TR5?
TR5 (Cornwall) is supplied by South West Water. You can view their full profile and compliance data on our supplier page.
Should I use a water filter in TR5?
TR5 water scored 9.5/10 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 TR5 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for TR5, and the Environment Agency has no PFAS detections in rivers or groundwater within 10 km of it. That reflects where sampling has happened as much as the water itself.
How clean is the coastal water near TR5?
The Environment Agency rated the Lands End to Trevose Head as good for ecological health in its 2025 assessment, meaning the coastal water is only slightly changed from its natural state. 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 coastal water, not of tap water in TR5, which is treated before it reaches homes.
Keep reading
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River and groundwater readings near TR5
Environment Agency samples from rivers, groundwater and reservoirs nearby. Not your tap water. For scale they are shown against drinking water limits; rivers are judged against much stricter environmental standards, and on those every river in England fails for chemicals.
| Substance | Reading | Drinking water limit |
|---|---|---|
| Arsenic | 0.0091 mg/L | 0.01 mg/L |
| pH | 7.05 pH | None |
| Cadmium | 0.0021 mg/L | 0.005 mg/L |
| Hardness (as CaCO3) | 106 mg/L | None |
| Zinc | 0.99 mg/L | None |
| Nickel | 0.013 mg/L | 0.02 mg/L |
| Aluminium | 0.036 mg/L | 0.2 mg/L |
| Copper | 0.11 mg/L | 2 mg/L |
| Temperature | 10.8 °C | None |
| Conductivity | 340 µS/cm | None |
| Nitrate | 5.1 mg/L | 50 mg/L |
| Nitrite | 0.0041 mg/L | 0.5 mg/L |
| Phosphate | 0.1 mg/L | None |
| Dissolved Oxygen | 10.4 mg/L | None |
| Ammonia | 0.123 mg/L | 0.5 mg/L |
| Manganese | 0.0327 mg/L | 0.05 mg/L |
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