Tap water in PL25, CornwallSafe to drink.Soft.
Supplied by South West Water. 1,096 samples, 15 substances, latest on 19 December 2025. Everything is inside the legal limit, and nothing comes close to it.
9.4 / 10
The tank is as full as the score. The specks are the minerals that make water hard.
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 PL25 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%
- Nitrate15%
- Aluminium13%
- Colour10%
- Arsenic6%
- Iron4%
- Turbidity3%
- Antimony3%
- Selenium3%
- Manganese3%
- Lead3%
- Chromium2%
- Cadmium1%
- Copper<1%
- pH 7.8 pH
All 15 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Antimony | 0.00015 mg/L | 0.005 mg/L | 3% |
| 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 | 7.72 mg/L | 50 mg/L | 15% |
| 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 | 0.00806 mg/L | 0.2 mg/L | 4% |
| Manganese | 0.00129 mg/L | 0.05 mg/L | 3% |
| pH | 7.8 pH | No legal limit | – |
| Turbidity | 0.13 NTU | 4 NTU | 3% |
| Copper | 0.00328 mg/L | 2 mg/L | <1% |
| Lead | 0.000252 mg/L | 0.01 mg/L | 3% |
| Nickel | 0.0033 mg/L | 0.02 mg/L | 17% |
33mg of limescale minerals in every litre
Soft water. Kind to kettles, boilers and skin
You will not need a softener here, and you will use less soap and detergent than most of England.
Your river is the Crinnis River, rated moderate
The Environment Agency rated the Crinnis River as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by fish. 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
PL25 in short
Tap water in PL25 (Cornwall) is supplied by South West Water in the Cornwall Central zone and scores 9.4 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 19 December 2025.
- Every one of the 10 neighbouring districts scores higherEX23 next door scores 9.5, against 9.4 here. Supply zones, not distance, explain the gap. See EX23
- 37th cleanest of 45 areas tested in Cornwall8 areas in Cornwall scored lower. The best is EX23 on 9.5.
- Soft water at 33 mg/LLimescale is not a problem in PL25, so skip softeners and scale filters entirely. How hardness is measured
Questions about PL25 water
Is PL25 tap water safe to drink?
Based on the latest tests, PL25 (Cornwall) water scores 9.4/10, which is safe. 0 of 15 tested contaminants exceeded recommended levels. Water is supplied by South West Water.
What contaminants are in PL25 water?
We tested 15 contaminants in PL25 water. None exceeded recommended safe levels.
Who supplies water in PL25?
PL25 (Cornwall) is supplied by South West Water. You can view their full profile and compliance data on our supplier page.
Is PL25 water hard or soft?
Water in PL25 (Cornwall) has a hardness of 33 mg/L CaCO3, which is classified as soft. Soft water is gentle on appliances and skin.
Should I use a water filter in PL25?
PL25 water scored 9.4/10 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 PL25 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for PL25, 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 PL25?
The Environment Agency rated the Crinnis River as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by fish. 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 PL25, 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
- Best Water Filters UKEvery filter type compared on what it actually removes
- 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
How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
River and groundwater readings near PL25
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 | 7.13 pH | None |
| Temperature | 13.3 °C | None |
| Conductivity | 150 µS/cm | None |
| Ammonia | 0.11 mg/L | 0.5 mg/L |
| Nitrate | 0.59 mg/L | 50 mg/L |
| Nitrite | 0.02 mg/L | 0.5 mg/L |
| Phosphate | 0.043 mg/L | None |
| Dissolved Oxygen | 9.67 mg/L | None |
| Cadmium | 0.000033 mg/L | 0.005 mg/L |
| Zinc | 0.02 mg/L | None |
| Nickel | 0.0032 mg/L | 0.02 mg/L |
| Aluminium | 0.036 mg/L | 0.2 mg/L |
| Copper | 0.014 mg/L | 2 mg/L |
| Lead | 0.00013 mg/L | 0.01 mg/L |
| Hardness (as CaCO3) | 47.4 mg/L | None |
Get alerts for your area
We'll email you when water quality data changes for PL25.