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tapwater
England and Wales average 9.0

Tap water in ST4, Stoke-on-TrentSafe to drink.

Supplied by Severn Trent. 890 samples, 20 substances, latest on 24 December 2025. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.4 / 10

The tank is as full as the score.

What to do about it

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Basic chlorine and taste improvement on a budget

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What's in a glass of ST4 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.

Nitrate came closest to a limit, at 24% of it. 17 of 17 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitSelenium: 0.00019 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Chromium: 0.00042 mg/L, <1% of the 0.05 mg/L limitChromium<1%Copper: 0.0171 mg/L, <1% of the 2 mg/L limitCopper<1%Nitrite: 0.005 mg/L, 1% of the 0.5 mg/L limitNitrite1%Cadmium: 0.00006 mg/L, 1% of the 0.005 mg/L limitCadmium1%Lead: 0.00014 mg/L, 1% of the 0.01 mg/L limitLead1%Manganese: 0.00073 mg/L, 1% of the 0.05 mg/L limitManganese1%Antimony: 0.000076 mg/L, 2% of the 0.005 mg/L limitAntimony2%Arsenic: 0.00023 mg/L, 2% of the 0.01 mg/L limitArsenic2%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Iron: 0.0074 mg/L, 4% of the 0.2 mg/L limitIron4%Colour: 0.8 mg/L Pt/Co, 4% of the 20 mg/L Pt/Co limitColour4%Fluoride: 0.08 mg/L, 5% of the 1.5 mg/L limitFluoride5%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Nickel: 0.0023 mg/L, 12% of the 0.02 mg/L limitNickel12%Trihalomethanes: 0.0224 mg/L, 22% of the 0.1 mg/L limitTrihalomethanes22%Nitrate: 12.2 mg/L, 24% of the 50 mg/L limitNitrate24%
  1. Nitrate24%
  2. Trihalomethanes22%
  3. Nickel12%
  4. Aluminium11%
  5. Fluoride5%
  6. Colour4%
  7. Iron4%
  8. Turbidity3%
  9. Arsenic2%
  10. Antimony2%
  11. Manganese1%
  12. Lead1%
  13. Cadmium1%
  14. Nitrite1%
  15. Copper<1%
  16. Chromium<1%
  17. Selenium<1%
  • Conductivity 282 µS/cm
  • pH 7.45 pH
  • Phosphate 0.919 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
Manganese0.00073 mg/L0.05 mg/L
1%
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
Turbidity0.12 NTU4 NTU
3%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.0074 mg/L0.2 mg/L
4%
Conductivity282 µS/cmNo legal limit–
pH7.45 pHNo legal limit–
Lead0.00014 mg/L0.01 mg/L
1%
Nitrate12.2 mg/L50 mg/L
24%
Antimony0.000076 mg/L0.005 mg/L
2%
Nitrite0.005 mg/L0.5 mg/L
1%
Selenium0.00019 mg/L0.04 mg/L
<1%
Copper0.0171 mg/L2 mg/L
<1%
Fluoride0.08 mg/L1.5 mg/L
5%
Arsenic0.00023 mg/L0.01 mg/L
2%
Cadmium0.00006 mg/L0.005 mg/L
1%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0023 mg/L0.02 mg/L
12%
Trihalomethanes0.0224 mg/L0.1 mg/L
22%
Phosphate0.919 mg/LNo legal limit–
Outside your tap

Your river is the Trent from Fowlea Brook to Tittensor, rated moderate

The Environment Agency rated the Trent from Fowlea Brook to Tittensor 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, 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

Within 10 km

64

forever-chemical detections in nearby rivers and groundwater

At 6 sites. The highest was PFOA at 0.028 µg/L, at RSN0342 Lyme Brook, 1.9 km away, in February 2024. These are river and borehole samples, not tests of your tap water.

Every PFAS sample around Stoke-on-Trent · Which filters remove PFAS · PFAS explained

ST4 in short

Tap water in ST4 (Stoke-on-Trent) is supplied by Severn Trent in the Stoke-on-Trent Central zone and scores 9.4 out of 10, against an England and Wales average of 9.0. None of the 20 tested substances came close to a limit. The latest sample is from 24 December 2025.

  • 3rd cleanest of 5 areas tested in Stoke-on-TrentSquarely mid-table for Stoke-on-Trent, between ST1 on 9.4 and ST6 on 9.3. Every area in Stoke-on-Trent
  • PFAS found at 6 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was PFOA about 1.9 km away. What was measured
  • Nothing tested came within 40% of its legal limitThe highest was Nitrate at 24% of the 50 mg/L maximum. See every reading

Next door

ST39.4 out of 10ST19.4 out of 10ST69.3 out of 10ST29.3 out of 10ST129.0 out of 10

Questions about ST4 water

Is ST4 tap water safe to drink?

Based on the latest tests, ST4 (Stoke-on-Trent) water scores 9.4/10, which is safe. 0 of 20 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in ST4 water?

We tested 20 contaminants in ST4 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 ST4?

ST4 (Stoke-on-Trent) is supplied by Severn Trent. You can view their full profile and compliance data on our supplier page.

Should I use a water filter in ST4?

ST4 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 ST4 water?

The tap-water tests we hold for ST4 do not include a PFAS result. Environment Agency monitoring found PFAS in 64 river and groundwater samples from 6 sites within 10 km of ST4, the highest being PFOA at 0.028 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 river near ST4?

The Environment Agency rated the Trent from Fowlea Brook to Tittensor 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, 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 ST4, which is treated before it reaches homes.

Keep reading

PFAS explainedHow to test your waterBest water filtersFilter shower headsWater testing kitsAll of Stoke-on-TrentUK water rankingsWater hardness checkerWater hardness map

River and groundwater readings near ST4

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
Iron0.22 mg/L0.2 mg/L
pH8.02 pHNone
Temperature15.2 °CNone
Conductivity655 µS/cmNone
Ammonia0.12 mg/L0.5 mg/L
Nitrate1.6 mg/L50 mg/L
Nitrite0.022 mg/L0.5 mg/L
Phosphate0.2 mg/LNone
Dissolved Oxygen9.3 mg/LNone
Cadmium0.0001 mg/L0.005 mg/L

Get alerts for your area

We'll email you when water quality data changes for ST4.

Source: Severn Trent 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