Tap water in PR7, ChorleySafe to drink.Slightly hard.
Supplied by United Utilities. 2,152 samples, 16 substances, latest on 28 December 2024. Everything is inside the legal limit, and nothing comes close to it.
9.5 / 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 PR7 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.
Trihalomethanes came closest to a limit, at 26% of it. 15 of 16 substances used under a quarter of theirs.
- Trihalomethanes26%
- Bromate7%
- Ammonia6%
- Antimony6%
- Nitrate6%
- Lead6%
- Turbidity5%
- Nickel4%
- Iron3%
- Aluminium3%
- Selenium2%
- Cadmium2%
- Chromium2%
- Nitrite2%
- Manganese<1%
- Copper<1%
All 16 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Turbidity | 0.2 NTU | 4 NTU | 5% |
| Nitrate | 2.92 mg/L | 50 mg/L | 6% |
| Nitrite | 0.0075 mg/L | 0.5 mg/L | 2% |
| Ammonia | 0.0321 mg/L | 0.5 mg/L | 6% |
| Aluminium | 0.00622 mg/L | 0.2 mg/L | 3% |
| Iron | 0.007 mg/L | 0.2 mg/L | 3% |
| Manganese | 0.00045 mg/L | 0.05 mg/L | <1% |
| Trihalomethanes | 0.0264 mg/L | 0.1 mg/L | 26% |
| Copper | 0.0000243 mg/L | 2 mg/L | <1% |
| Nickel | 0.00077 mg/L | 0.02 mg/L | 4% |
| Lead | 0.00055 mg/L | 0.01 mg/L | 6% |
| Cadmium | 0.00009 mg/L | 0.005 mg/L | 2% |
| Chromium | 0.00083 mg/L | 0.05 mg/L | 2% |
| Antimony | 0.00031 mg/L | 0.005 mg/L | 6% |
| Selenium | 0.00085 mg/L | 0.04 mg/L | 2% |
| Bromate | 0.00073 mg/L | 0.01 mg/L | 7% |
137mg of limescale minerals in every litre
Middling hardness. Some scale, slowly
Below the point where a softener pays for itself. Descaling the kettle now and then is all most homes need.
Your river is the Yarrow DS Big Lodge Water, rated moderate
The Environment Agency rated the Yarrow DS Big Lodge Water as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by phosphate, insects and other small river life and water plants and algae. 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
44
forever-chemical detections in nearby rivers and groundwater
At 4 sites. The highest was 6:2 FTSA at 0.045 µg/L, at Sunlight Services, Chorley BH SD51/192, 2.8 km away, in February 2026. These are river and borehole samples, not tests of your tap water.
Every PFAS sample around Preston · Which filters remove PFAS · PFAS explained
PR7 in short
Tap water in PR7 (Chorley) is supplied by United Utilities in the Chorley 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 28 December 2024.
- PFAS found at 4 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was 6:2 FTSA about 2.8 km away. What was measured
- Nothing tested came within 40% of its legal limitThe highest was Trihalomethanes at 26% of the 0.1 mg/L maximum. See every reading
- Moderately hard water at 137 mg/LSome scale over time in PR7, but not enough to justify a softener for most homes. How hardness is measured
Questions about PR7 water
Is PR7 tap water safe to drink?
Based on the latest tests, PR7 (Chorley) water scores 9.5/10, which is safe. 0 of 16 tested contaminants exceeded recommended levels. Water is supplied by United Utilities.
What contaminants are in PR7 water?
We tested 16 contaminants in PR7 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 PR7?
PR7 (Chorley) is supplied by United Utilities. You can view their full profile and compliance data on our supplier page.
Is PR7 water hard or soft?
Water in PR7 (Chorley) has a hardness of 137 mg/L CaCO3, which is classified as moderately hard. This is a moderate hardness level.
Should I use a water filter in PR7?
PR7 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 PR7 water?
The tap-water tests we hold for PR7 do not include a PFAS result. Environment Agency monitoring found PFAS in 44 river and groundwater samples from 4 sites within 10 km of PR7, the highest being 6:2 FTSA at 0.045 µg/L about 2.8 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 PR7?
The Environment Agency rated the Yarrow DS Big Lodge Water as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by phosphate, insects and other small river life and water plants and algae. 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 PR7, 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
River and groundwater readings near PR7
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 |
|---|---|---|
| Aluminium | 0.425 mg/L | 0.2 mg/L |
| pH | 8.1 pH | None |
| Temperature | 9.4 °C | None |
| Conductivity | 328 µS/cm | None |
| Nitrate | 0.83 mg/L | 50 mg/L |
| Nitrite | 0.0076 mg/L | 0.5 mg/L |
| Phosphate | 0.055 mg/L | None |
| Dissolved Oxygen | 11.2 mg/L | None |
| Ammonia | 0.28 mg/L | 0.5 mg/L |
| Lead | 0.00482 mg/L | 0.01 mg/L |
| Chromium | 0.00137 mg/L | 0.05 mg/L |
| Zinc | 0.0107 mg/L | None |
| Copper | 0.00457 mg/L | 2 mg/L |
Get alerts for your area
We'll email you when water quality data changes for PR7.