Tap water in CH31, WirralSafe to drink.Moderately soft.
Supplied by United Utilities. 205 samples, 16 substances, latest on 16 September 2024. Everything is inside the legal limit, and nothing comes close to it.
9.1 / 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 CH31 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 62% of it. 15 of 16 substances used under a quarter of theirs.
- Trihalomethanes62%
- Nitrate22%
- Ammonia11%
- Antimony6%
- Nickel6%
- Lead6%
- Turbidity4%
- Iron3%
- Bromate3%
- Aluminium3%
- Selenium2%
- Nitrite2%
- Cadmium2%
- Chromium2%
- Manganese<1%
- Copper<1%
All 16 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| 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 | 0.0617 mg/L | 0.1 mg/L | 62% |
| Turbidity | 0.16 NTU | 4 NTU | 4% |
| Copper | 0.0000104 mg/L | 2 mg/L | <1% |
| Nickel | 0.00121 mg/L | 0.02 mg/L | 6% |
| Lead | 0.00055 mg/L | 0.01 mg/L | 6% |
| Nitrate | 11.1 mg/L | 50 mg/L | 22% |
| Nitrite | 0.0098 mg/L | 0.5 mg/L | 2% |
| Ammonia | 0.054 mg/L | 0.5 mg/L | 11% |
| 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 | 0.00033 mg/L | 0.01 mg/L | 3% |
95mg 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 Dibbinsdale Brook and Clatter Brook, rated poor
The Environment Agency rated the Dibbinsdale Brook and Clatter Brook as poor for ecological health in its 2025 assessment, meaning the river is badly affected, with much of the expected wildlife missing. It is held back by dissolved oxygen, fish and insects and other small river life. 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
41
forever-chemical detections in nearby rivers and groundwater
At 7 sites. The highest was PFOA at 0.0076 µg/L, at RSN1359 Dibbinsdale Brook, 7.6 km away, in February 2025. These are river and borehole samples, not tests of your tap water.
Every PFAS sample around Liverpool · Which filters remove PFAS · PFAS explained
CH31 in short
Tap water in CH31 (Wirral) is supplied by United Utilities in the Wirral Central zone and scores 9.1 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 16 September 2024.
- The newest sample here is from September 2024That is over 2 years old, so treat this page as a record of past results rather than today's tap water.
- Trihalomethanes is the reading closest to its limit, at 62% of the 0.1 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
- 17th cleanest of 21 areas tested in Wirral4 areas in Wirral scored lower. The best is CH26 on 9.7.
Questions about CH31 water
Is CH31 tap water safe to drink?
Based on the latest tests, CH31 (Wirral) water scores 9.1/10, which is safe. 0 of 16 tested contaminants exceeded recommended levels. Water is supplied by United Utilities.
What contaminants are in CH31 water?
We tested 16 contaminants in CH31 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 CH31?
CH31 (Wirral) is supplied by United Utilities. You can view their full profile and compliance data on our supplier page.
Is CH31 water hard or soft?
Water in CH31 (Wirral) has a hardness of 95 mg/L CaCO3, which is classified as moderately soft. This is a moderate hardness level.
Should I use a water filter in CH31?
CH31 water scored 9.1/10 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 CH31 water?
The tap-water tests we hold for CH31 do not include a PFAS result. Environment Agency monitoring found PFAS in 41 river and groundwater samples from 7 sites within 10 km of CH31, the highest being PFOA at 0.0076 µg/L about 7.6 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 CH31?
The Environment Agency rated the Dibbinsdale Brook and Clatter Brook as poor for ecological health in its 2025 assessment, meaning the river is badly affected, with much of the expected wildlife missing. It is held back by dissolved oxygen, fish and insects and other small river life. 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 CH31, 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 CH31
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 |
|---|---|---|
| Ammonia | 1.7 mg/L | 0.5 mg/L |
| pH | 7.2 pH | None |
| Temperature | 12.6 °C | None |
| Conductivity | 842 µS/cm | None |
| Cadmium | 0.000024 mg/L | 0.005 mg/L |
| Nitrate | 4.1 mg/L | 50 mg/L |
| Nitrite | 0.22 mg/L | 0.5 mg/L |
| Hardness (as CaCO3) | 362 mg/L | None |
| Fluoride | 0.13 mg/L | 1.5 mg/L |
| Phosphate | 0.18 mg/L | None |
| Lead | 0.00001 mg/L | 0.01 mg/L |
| Zinc | 0.086 mg/L | None |
| Nickel | 0.00084 mg/L | 0.02 mg/L |
| Manganese | 0.0006 mg/L | 0.05 mg/L |
| Copper | 0.00004 mg/L | 2 mg/L |
Get alerts for your area
We'll email you when water quality data changes for CH31.