Tap water in TR11, CornwallSafe to drink.
Supplied by South West Water. 984 samples, 16 substances, latest on 11 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 TR11 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.
Nickel came closest to a limit, at 17% of it. 15 of 15 substances used under a quarter of theirs.
- Nickel17%
- Aluminium13%
- Colour10%
- Nitrate10%
- Arsenic6%
- Iron4%
- Turbidity3%
- Selenium3%
- Antimony2%
- Chromium2%
- Bromate1%
- Cadmium1%
- Lead1%
- Manganese<1%
- Copper<1%
- pH 7.7 pH
All 16 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| 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 | 0.00035 mg/L | 0.05 mg/L | <1% |
| pH | 7.7 pH | No legal limit | – |
| Turbidity | 0.13 NTU | 4 NTU | 3% |
| Copper | 0.00598 mg/L | 2 mg/L | <1% |
| Lead | 0.0001 mg/L | 0.01 mg/L | 1% |
| Nickel | 0.0033 mg/L | 0.02 mg/L | 17% |
| Bromate | 0.000132 mg/L | 0.01 mg/L | 1% |
| Antimony | 0.00012 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 | 5 mg/L | 50 mg/L | 10% |
| Selenium | 0.0012 mg/L | 0.04 mg/L | 3% |
Your coastal water is the Carrick Roads Outer, rated good
The Environment Agency rated the Carrick Roads Outer 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
TR11 in short
Tap water in TR11 (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 16 tested substances came close to a limit. The latest sample is from 11 December 2025.
- 18th cleanest of 45 areas tested in CornwallSquarely mid-table for Cornwall, between EX23 on 9.5 and TR1 on 8.3.
- Nothing tested came within 40% of its legal limitThe highest was Nickel at 17% of the 0.02 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 TR11 water
Is TR11 tap water safe to drink?
Based on the latest tests, TR11 (Cornwall) water scores 9.5/10, which is safe. 0 of 16 tested contaminants exceeded recommended levels. Water is supplied by South West Water.
What contaminants are in TR11 water?
We tested 16 contaminants in TR11 water. None exceeded recommended safe levels.
Who supplies water in TR11?
TR11 (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 TR11?
TR11 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 TR11 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for TR11, 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 TR11?
The Environment Agency rated the Carrick Roads Outer 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 TR11, which is treated before it reaches homes.
Keep reading
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River and groundwater readings near TR11
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.
Get alerts for your area
We'll email you when water quality data changes for TR11.