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tapwater
England and Wales average 9.0

Tap water in WA4, WarringtonSafe to drink.Slightly hard.

Supplied by United Utilities. 2,331 samples, 16 substances, latest on 31 December 2024. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

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

ZeroWater 12-Cup Ready-Pour

£40typical price

Households concerned about PFAS and heavy metals

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Waterdrop 10UA Under Sink

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High-volume under-sink filtration without RO complexity

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BRITA Marella XL + MAXTRA PRO

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Basic chlorine and taste improvement on a budget

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What's in a glass of WA4 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 36% of it. 15 of 16 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.0000104 mg/L, <1% of the 2 mg/L limitCopper<1%Chromium: 0.00083 mg/L, 2% of the 0.05 mg/L limitChromium2%Cadmium: 0.00009 mg/L, 2% of the 0.005 mg/L limitCadmium2%Manganese: 0.00096 mg/L, 2% of the 0.05 mg/L limitManganese2%Selenium: 0.00085 mg/L, 2% of the 0.04 mg/L limitSelenium2%Aluminium: 0.00622 mg/L, 3% of the 0.2 mg/L limitAluminium3%Bromate: 0.00037 mg/L, 4% of the 0.01 mg/L limitBromate4%Nickel: 0.00077 mg/L, 4% of the 0.02 mg/L limitNickel4%Turbidity: 0.16 NTU, 4% of the 4 NTU limitTurbidity4%Antimony: 0.00031 mg/L, 6% of the 0.005 mg/L limitAntimony6%Ammonia: 0.0321 mg/L, 6% of the 0.5 mg/L limitAmmonia6%Nitrate: 3.94 mg/L, 8% of the 50 mg/L limitNitrate8%Lead: 0.00147 mg/L, 15% of the 0.01 mg/L limitLead15%Iron: 0.031 mg/L, 16% of the 0.2 mg/L limitIron16%Nitrite: 0.079 mg/L, 16% of the 0.5 mg/L limitNitrite16%Trihalomethanes: 0.0361 mg/L, 36% of the 0.1 mg/L limitTrihalomethanes36%
  1. Trihalomethanes36%
  2. Nitrite16%
  3. Iron16%
  4. Lead15%
  5. Nitrate8%
  6. Ammonia6%
  7. Antimony6%
  8. Turbidity4%
  9. Nickel4%
  10. Bromate4%
  11. Aluminium3%
  12. Selenium2%
  13. Manganese2%
  14. Cadmium2%
  15. Chromium2%
  16. Copper<1%
All 16 results as a table
SubstanceResultLegal limitShare of limit
Nitrite0.079 mg/L0.5 mg/L
16%
Turbidity0.16 NTU4 NTU
4%
Nitrate3.94 mg/L50 mg/L
8%
Ammonia0.0321 mg/L0.5 mg/L
6%
Aluminium0.00622 mg/L0.2 mg/L
3%
Iron0.031 mg/L0.2 mg/L
16%
Manganese0.00096 mg/L0.05 mg/L
2%
Bromate0.00037 mg/L0.01 mg/L
4%
Copper0.0000104 mg/L2 mg/L
<1%
Nickel0.00077 mg/L0.02 mg/L
4%
Lead0.00147 mg/L0.01 mg/L
15%
Trihalomethanes0.0361 mg/L0.1 mg/L
36%
Cadmium0.00009 mg/L0.005 mg/L
2%
Chromium0.00083 mg/L0.05 mg/L
2%
Antimony0.00031 mg/L0.005 mg/L
6%
Selenium0.00085 mg/L0.04 mg/L
2%

121mg 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.

Soft400 mg/L
Outside your tap

Your estuary is the Mersey, rated moderate

The Environment Agency rated the Mersey as moderate for ecological health in its 2025 assessment, meaning the estuary is noticeably changed by pollution or engineering. It is held back by insects and other small river life, specific pollutants and algal blooms. 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

Within 10 km

273

forever-chemical detections in nearby rivers and groundwater

At 8 sites. The highest was PFOS (linear) at 0.098 µg/L, at Solvay Interox Borehole No 1 Wrb No SJ58/71 Appn No 1391, 1.9 km away, in July 2023. These are river and borehole samples, not tests of your tap water.

Every PFAS sample around Warrington · Which filters remove PFAS · PFAS explained

WA4 in short

Tap water in WA4 (Warrington) is supplied by United Utilities in the Warrington 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.

  • The lowest score of the 6 areas tested in WarringtonWA4 scores 9.2 out of 10. The best in Warrington, WA2, scores 9.4. Every area in Warrington
  • PFAS found at 8 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was PFOS (linear) about 1.9 km away. What was measured
  • Nothing tested came within 40% of its legal limitThe highest was Trihalomethanes at 36% of the 0.1 mg/L maximum. See every reading

Next door

WA139.2 out of 10 · 121 mg/LWA19.3 out of 10 · 91 mg/LWA59.3 out of 10 · 94 mg/LWA29.4 out of 10 · 205 mg/LWA39.4 out of 10 · 59 mg/L

Questions about WA4 water

Is WA4 tap water safe to drink?

Based on the latest tests, WA4 (Warrington) 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 WA4 water?

We tested 16 contaminants in WA4 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 WA4?

WA4 (Warrington) is supplied by United Utilities. You can view their full profile and compliance data on our supplier page.

Is WA4 water hard or soft?

Water in WA4 (Warrington) has a hardness of 121 mg/L CaCO3, which is classified as moderately hard. This is a moderate hardness level.

Should I use a water filter in WA4?

WA4 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 WA4 water?

The tap-water tests we hold for WA4 do not include a PFAS result. Environment Agency monitoring found PFAS in 273 river and groundwater samples from 8 sites within 10 km of WA4, the highest being PFOS (linear) at 0.098 µg/L about 1.9 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 estuary near WA4?

The Environment Agency rated the Mersey as moderate for ecological health in its 2025 assessment, meaning the estuary is noticeably changed by pollution or engineering. It is held back by insects and other small river life, specific pollutants and algal blooms. 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 estuary, not of tap water in WA4, which is treated before it reaches homes.

Keep reading

PFAS explainedHow to test your waterBest water filtersFilter shower headsWater testing kitsAll of WarringtonUK water rankingsWater hardness checkerWater hardness map

River and groundwater readings near WA4

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.

SubstanceReadingDrinking water limit
Ammonia0.42 mg/L0.5 mg/L
pH6.94 pHNone
Temperature17.2 °CNone
Conductivity439 µS/cmNone
Nitrate6.3 mg/L50 mg/L
Nitrite0.15 mg/L0.5 mg/L
Phosphate0.39 mg/LNone
Dissolved Oxygen6.08 mg/LNone
PFAS (total)0.0041 µg/LNone

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We'll email you when water quality data changes for WA4.

Source: United Utilities test results, published through the Stream Water Data Portal; rivers and PFAS from the Environment Agency. Page updated . How we score · Where the data comes from