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tapwater
England and Wales average 9.0

Tap water in CV37, Stratford-on-AvonSafe to drink.

Supplied by Severn Trent. 908 samples, 20 substances, latest on 29 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 CV37 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 36% of it. 16 of 17 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%Selenium: 0.0001 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Nitrite: 0.003 mg/L, <1% of the 0.5 mg/L limitNitrite<1%Chromium: 0.00042 mg/L, <1% of the 0.05 mg/L limitChromium<1%Lead: 0.00014 mg/L, 1% of the 0.01 mg/L limitLead1%Arsenic: 0.00017 mg/L, 2% of the 0.01 mg/L limitArsenic2%Antimony: 0.000142 mg/L, 3% of the 0.005 mg/L limitAntimony3%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Colour: 0.8 mg/L Pt/Co, 4% of the 20 mg/L Pt/Co limitColour4%Copper: 0.0839 mg/L, 4% of the 2 mg/L limitCopper4%Iron: 0.0089 mg/L, 4% of the 0.2 mg/L limitIron4%Nickel: 0.0013 mg/L, 7% of the 0.02 mg/L limitNickel7%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Manganese: 0.00572 mg/L, 11% of the 0.05 mg/L limitManganese11%Fluoride: 0.22 mg/L, 15% of the 1.5 mg/L limitFluoride15%Trihalomethanes: 0.0238 mg/L, 24% of the 0.1 mg/L limitTrihalomethanes24%Nitrate: 17.8 mg/L, 36% of the 50 mg/L limitNitrate36%
  1. Nitrate36%
  2. Trihalomethanes24%
  3. Fluoride15%
  4. Manganese11%
  5. Aluminium11%
  6. Nickel7%
  7. Iron4%
  8. Copper4%
  9. Colour4%
  10. Turbidity3%
  11. Antimony3%
  12. Arsenic2%
  13. Lead1%
  14. Chromium<1%
  15. Nitrite<1%
  16. Selenium<1%
  17. Cadmium<1%
  • pH 7.66 pH
  • Conductivity 690 µS/cm
  • Phosphate 0.846 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.0089 mg/L0.2 mg/L
4%
Manganese0.00572 mg/L0.05 mg/L
11%
pH7.66 pHNo legal limit–
Nitrate17.8 mg/L50 mg/L
36%
Nitrite0.003 mg/L0.5 mg/L
<1%
Copper0.0839 mg/L2 mg/L
4%
Fluoride0.22 mg/L1.5 mg/L
15%
Arsenic0.00017 mg/L0.01 mg/L
2%
Cadmium0.00001 mg/L0.005 mg/L
<1%
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0013 mg/L0.02 mg/L
7%
Lead0.00014 mg/L0.01 mg/L
1%
Antimony0.000142 mg/L0.005 mg/L
3%
Selenium0.0001 mg/L0.04 mg/L
<1%
Turbidity0.12 NTU4 NTU
3%
Conductivity690 µS/cmNo legal limit–
Trihalomethanes0.0238 mg/L0.1 mg/L
24%
Phosphate0.846 mg/LNo legal limit–
Outside your tap

Your river is the Avon- Tramway Br Stratford to Workman Br Evesham, rated moderate

The Environment Agency rated the Avon- Tramway Br Stratford to Workman Br Evesham 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. 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

CV37 in short

Tap water in CV37 (Stratford-on-Avon) is supplied by Severn Trent in the Stratford-on-Avon Central zone and scores 9.3 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 29 December 2025.

  • 3rd cleanest of 8 areas tested in Stratford-on-AvonOnly 2 areas in Stratford-on-Avon scored higher. The best is B49 on 9.3.
  • Nothing tested came within 40% of its legal limitThe highest was Nitrate at 36% of the 50 mg/L maximum. See every reading
  • Scores higher than 5 of 7 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

B959.3 out of 10B949.2 out of 10B808.9 out of 10B499.3 out of 10B508.9 out of 10CV369.0 out of 10CV478.9 out of 10

Questions about CV37 water

Is CV37 tap water safe to drink?

Based on the latest tests, CV37 (Stratford-on-Avon) water scores 9.3/10, which is safe. 0 of 20 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in CV37 water?

We tested 20 contaminants in CV37 water. None exceeded recommended safe levels.

Who supplies water in CV37?

CV37 (Stratford-on-Avon) 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 CV37?

CV37 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 CV37 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for CV37, 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 CV37?

The Environment Agency rated the Avon- Tramway Br Stratford to Workman Br Evesham 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. 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 CV37, 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 CV37

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
pH7.86 pHNone
Temperature19.3 °CNone
Conductivity984 µS/cmNone
Ammonia0.05 mg/L0.5 mg/L
Nitrate13 mg/L50 mg/L
Nitrite0.068 mg/L0.5 mg/L
Phosphate0.16 mg/LNone
Dissolved Oxygen8.07 mg/LNone
Iron0.031 mg/L0.2 mg/L
Copper0.0047 mg/L2 mg/L
Zinc0.0103 mg/LNone
Nickel0.0038 mg/L0.02 mg/L
Cadmium0.0001 mg/L0.005 mg/L
Chromium0.0013 mg/L0.05 mg/L

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We'll email you when water quality data changes for CV37.

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