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tapwater
England and Wales average 9.0

Tap water in TF4, Telford and WrekinSafe to drink.

Supplied by Severn Trent. 973 samples, 22 substances, latest on 16 December 2025. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.3 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of TF4 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 59% of it. 18 of 19 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCadmium: 0.00001 mg/L, <1% of the 0.005 mg/L limitCadmium<1%Chromium: 0.00042 mg/L, <1% of the 0.05 mg/L limitChromium<1%Selenium: 0.00039 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Copper: 0.0205 mg/L, 1% of the 2 mg/L limitCopper1%Antimony: 0.000059 mg/L, 1% of the 0.005 mg/L limitAntimony1%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%Mercury: 0.000022 mg/L, 2% of the 0.001 mg/L limitMercury2%Nitrite: 0.013 mg/L, 3% of the 0.5 mg/L limitNitrite3%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Boron: 0.03 mg/L, 3% of the 1 mg/L limitBoron3%Iron: 0.007 mg/L, 3% of the 0.2 mg/L limitIron3%Colour: 0.8 mg/L Pt/Co, 4% of the 20 mg/L Pt/Co limitColour4%Nickel: 0.001 mg/L, 5% of the 0.02 mg/L limitNickel5%Fluoride: 0.1 mg/L, 7% of the 1.5 mg/L limitFluoride7%Trihalomethanes: 0.0083 mg/L, 8% of the 0.1 mg/L limitTrihalomethanes8%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Arsenic: 0.0014 mg/L, 14% of the 0.01 mg/L limitArsenic14%Nitrate: 29.5 mg/L, 59% of the 50 mg/L limitNitrate59%
  1. Nitrate59%
  2. Arsenic14%
  3. Aluminium11%
  4. Trihalomethanes8%
  5. Fluoride7%
  6. Nickel5%
  7. Colour4%
  8. Iron3%
  9. Turbidity3%
  10. Boron3%
  11. Nitrite3%
  12. Mercury2%
  13. Manganese1%
  14. Lead1%
  15. Antimony1%
  16. Copper1%
  17. Selenium<1%
  18. Chromium<1%
  19. Cadmium<1%
  • pH 7.47 pH
  • Conductivity 565 µS/cm
  • Phosphate 0.091 mg/L
All 22 results as a table
SubstanceResultLegal limitShare of limit
pH7.47 pHNo legal limit–
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
Turbidity0.12 NTU4 NTU
3%
Chromium0.00042 mg/L0.05 mg/L
<1%
Mercury0.000022 mg/L0.001 mg/L
2%
Nitrate29.5 mg/L50 mg/L
59%
Nickel0.001 mg/L0.02 mg/L
5%
Conductivity565 µS/cmNo legal limit–
Nitrite0.013 mg/L0.5 mg/L
3%
Lead0.00014 mg/L0.01 mg/L
1%
Antimony0.000059 mg/L0.005 mg/L
1%
Selenium0.00039 mg/L0.04 mg/L
<1%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.007 mg/L0.2 mg/L
3%
Manganese0.00073 mg/L0.05 mg/L
1%
Copper0.0205 mg/L2 mg/L
1%
Fluoride0.1 mg/L1.5 mg/L
7%
Arsenic0.0014 mg/L0.01 mg/L
14%
Cadmium0.00001 mg/L0.005 mg/L
<1%
Boron0.03 mg/L1 mg/L
3%
Trihalomethanes0.0083 mg/L0.1 mg/L
8%
Phosphate0.091 mg/LNo legal limit–
Outside your tap

Your river is the Lyde Bk - source to conf R Severn, rated moderate

The Environment Agency rated the Lyde Bk - source to conf R Severn as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. 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

TF4 in short

Tap water in TF4 (Telford and Wrekin) is supplied by Severn Trent in the Telford and Wrekin Central zone and scores 9.3 out of 10, against an England and Wales average of 9.0. None of the 22 tested substances came close to a limit. The latest sample is from 16 December 2025.

  • Nitrate is the reading closest to its limit, at 59% of the 50 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 3rd cleanest of 9 areas tested in Telford and WrekinOnly 2 areas in Telford and Wrekin scored higher. The best is TF6 on 9.7.
  • Scores higher than 5 of 8 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

TF19.3 out of 10TF29.2 out of 10TF69.7 out of 10TF79.0 out of 10TF89.1 out of 10TF108.4 out of 10TF39.1 out of 10TF59.3 out of 10

Questions about TF4 water

Is TF4 tap water safe to drink?

Based on the latest tests, TF4 (Telford and Wrekin) water scores 9.3/10, which is safe. 0 of 22 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in TF4 water?

We tested 22 contaminants in TF4 water. None exceeded recommended safe levels.

Who supplies water in TF4?

TF4 (Telford and Wrekin) 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 TF4?

TF4 water scored 9.3/10 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 TF4 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for TF4, and the Environment Agency has no PFAS detections in rivers or groundwater within 10 km of it. That reflects where sampling has happened as much as the water itself.

How clean is the river near TF4?

The Environment Agency rated the Lyde Bk - source to conf R Severn as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. 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 TF4, which is treated before it reaches homes.

Keep reading

How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map

River and groundwater readings near TF4

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
Turbidity3.8 NTU4 NTU
pH8.37 pHNone
Temperature14.2 °CNone
Conductivity487 µS/cmNone
Nitrate4.8 mg/L50 mg/L
Nitrite0.011 mg/L0.5 mg/L
Phosphate0.05 mg/LNone
Dissolved Oxygen11.8 mg/LNone
Ammonia0.032 mg/L0.5 mg/L
Lead0.00159 mg/L0.01 mg/L
Hardness (as CaCO3)112 mg/LNone
Zinc0.00928 mg/LNone
Copper0.00446 mg/L2 mg/L
Chromium0.000534 mg/L0.05 mg/L
Cadmium0.00018 mg/L0.005 mg/L

Get alerts for your area

We'll email you when water quality data changes for TF4.

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