Tap water in L34, KnowsleySafe to drink.Moderately soft.
Supplied by United Utilities. 1,313 samples, 16 substances, latest on 31 December 2024. Everything is inside the legal limit, and nothing comes close to it.
9.2 / 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 L34 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 54% of it. 15 of 16 substances used under a quarter of theirs.
- Trihalomethanes54%
- Ammonia11%
- Nitrate10%
- Iron9%
- Antimony6%
- Bromate6%
- Lead6%
- Turbidity5%
- Nickel4%
- Aluminium3%
- Selenium2%
- Nitrite2%
- Cadmium2%
- Chromium2%
- Manganese1%
- Copper<1%
All 16 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Turbidity | 0.2 NTU | 4 NTU | 5% |
| Aluminium | 0.00622 mg/L | 0.2 mg/L | 3% |
| Iron | 0.018 mg/L | 0.2 mg/L | 9% |
| Manganese | 0.00073 mg/L | 0.05 mg/L | 1% |
| Copper | 0.0000174 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% |
| Trihalomethanes | 0.0543 mg/L | 0.1 mg/L | 54% |
| Bromate | 0.00059 mg/L | 0.01 mg/L | 6% |
| Nitrate | 4.96 mg/L | 50 mg/L | 10% |
| 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% |
63mg 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 Prescot Brook (Logwood Mill Brook), rated moderate
The Environment Agency rated the Prescot Brook (Logwood Mill Brook) 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, insects and other small river life and ammonia. 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
99
forever-chemical detections in nearby rivers and groundwater
At 8 sites. The highest was PFBA at 0.96 µg/L, at Kodak Ltd. Acorn Road. Wrb No SJ49/64, 5.5 km away, in June 2024. These are river and borehole samples, not tests of your tap water.
Every PFAS sample around Liverpool · Which filters remove PFAS · PFAS explained
L34 in short
Tap water in L34 (Knowsley) is supplied by United Utilities in the Knowsley Central zone and scores 9.2 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 31 December 2024.
- Trihalomethanes is the reading closest to its limit, at 54% of the 0.1 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
- 5th cleanest of 7 areas tested in Knowsley2 areas in Knowsley scored lower. The best is L33 on 9.4.
- PFAS found at 8 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was PFBA about 5.5 km away. What was measured
Questions about L34 water
Is L34 tap water safe to drink?
Based on the latest tests, L34 (Knowsley) water scores 9.2/10, which is safe. 0 of 16 tested contaminants exceeded recommended levels. Water is supplied by United Utilities.
What contaminants are in L34 water?
We tested 16 contaminants in L34 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 L34?
L34 (Knowsley) is supplied by United Utilities. You can view their full profile and compliance data on our supplier page.
Is L34 water hard or soft?
Water in L34 (Knowsley) has a hardness of 63 mg/L CaCO3, which is classified as moderately soft. This is a moderate hardness level.
Should I use a water filter in L34?
L34 water scored 9.2/10 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 L34 water?
The tap-water tests we hold for L34 do not include a PFAS result. Environment Agency monitoring found PFAS in 99 river and groundwater samples from 8 sites within 10 km of L34, the highest being PFBA at 0.96 µg/L about 5.5 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 L34?
The Environment Agency rated the Prescot Brook (Logwood Mill Brook) 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, insects and other small river life and ammonia. 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 L34, 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 L34
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 |
|---|---|---|
| Iron | 4.42 mg/L | 0.2 mg/L |
| Lead | 0.0124 mg/L | 0.01 mg/L |
| pH | 7.95 pH | None |
| Temperature | 5.3 °C | None |
| Conductivity | 452 µS/cm | None |
| Ammonia | 0.14 mg/L | 0.5 mg/L |
| Nitrate | 1.3 mg/L | 50 mg/L |
| Nitrite | 0.013 mg/L | 0.5 mg/L |
| Phosphate | 0.017 mg/L | None |
| Dissolved Oxygen | 12.2 mg/L | None |
| Hardness (as CaCO3) | 254 mg/L | None |
| Chromium | 0.00179 mg/L | 0.05 mg/L |
| Nickel | 0.00534 mg/L | 0.02 mg/L |
| Copper | 0.0084 mg/L | 2 mg/L |
| Zinc | 0.0215 mg/L | None |
| Cadmium | 0.000104 mg/L | 0.005 mg/L |
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