Tap water in TR9, CornwallSafe to drink.
Supplied by South West Water. 425 samples, 15 substances, latest on 17 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 TR9 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. 14 of 14 substances used under a quarter of theirs.
- Nickel17%
- Aluminium13%
- Colour10%
- Nitrate10%
- Arsenic6%
- Iron4%
- Turbidity3%
- Selenium3%
- Manganese3%
- Antimony2%
- Chromium2%
- Cadmium1%
- Lead1%
- Copper<1%
- pH 7.6 pH
All 15 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 | 0.00129 mg/L | 0.05 mg/L | 3% |
| pH | 7.6 pH | No legal limit | – |
| Turbidity | 0.13 NTU | 4 NTU | 3% |
| 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 | 5 mg/L | 50 mg/L | 10% |
| Selenium | 0.0012 mg/L | 0.04 mg/L | 3% |
| Copper | 0.00318 mg/L | 2 mg/L | <1% |
| Lead | 0.000112 mg/L | 0.01 mg/L | 1% |
| Nickel | 0.0033 mg/L | 0.02 mg/L | 17% |
Your river is the Porth Stream, rated good
The Environment Agency rated the Porth Stream as good for ecological health in its 2025 assessment, meaning the river 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. 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
TR9 in short
Tap water in TR9 (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 15 tested substances came close to a limit. The latest sample is from 17 December 2025.
- 34th cleanest of 45 areas tested in Cornwall11 areas in Cornwall scored lower. The best is EX23 on 9.5.
- 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 TR9 water
Is TR9 tap water safe to drink?
Based on the latest tests, TR9 (Cornwall) water scores 9.5/10, which is safe. 0 of 15 tested contaminants exceeded recommended levels. Water is supplied by South West Water.
What contaminants are in TR9 water?
We tested 15 contaminants in TR9 water. None exceeded recommended safe levels.
Who supplies water in TR9?
TR9 (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 TR9?
TR9 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 TR9 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for TR9, 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 river near TR9?
The Environment Agency rated the Porth Stream as good for ecological health in its 2025 assessment, meaning the river 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. Its ecological rating has improved since the previous assessment. This is a rating of the river, not of tap water in TR9, which is treated before it reaches homes.
Keep reading
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
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- How to Test Your Tap WaterFrom DIY strips to professional lab analysis
- Best Water Filter Jug UKBRITA vs ZeroWater vs the rest, tested against real data
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River and groundwater readings near TR9
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 |
|---|---|---|
| pH | 6.92 pH | None |
| Temperature | 12 °C | None |
| Conductivity | 154 µS/cm | None |
| Ammonia | 0.036 mg/L | 0.5 mg/L |
| Nitrate | 1 mg/L | 50 mg/L |
| Dissolved Oxygen | 10.1 mg/L | None |
| Hardness (as CaCO3) | 31.4 mg/L | None |
| Zinc | 0.0074 mg/L | None |
| Copper | 0.00017 mg/L | 2 mg/L |
| Cadmium | 0.0000209 mg/L | 0.005 mg/L |
| Nickel | 0.00215 mg/L | 0.02 mg/L |
| Aluminium | 0.132 mg/L | 0.2 mg/L |
| PFAS (total) | 0.00096 µg/L | None |
Get alerts for your area
We'll email you when water quality data changes for TR9.