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tapwater
England and Wales average 9.0

Tap water in CV36, Stratford-on-AvonSafe to drink.

Supplied by Severn Trent. 711 samples, 20 substances, latest on 19 December 2025. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.0 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of CV36 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.

Fluoride came closest to a limit, at 65% of it. 14 of 17 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.0021 mg/L, <1% of the 2 mg/L limitCopper<1%Cadmium: 0.00001 mg/L, <1% of the 0.005 mg/L limitCadmium<1%Selenium: 0.00009 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%Manganese: 0.00086 mg/L, 2% of the 0.05 mg/L limitManganese2%Arsenic: 0.00024 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%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%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Trihalomethanes: 0.0267 mg/L, 27% of the 0.1 mg/L limitTrihalomethanes27%Nitrate: 18.3 mg/L, 37% of the 50 mg/L limitNitrate37%Fluoride: 0.97 mg/L, 65% of the 1.5 mg/L limitFluoride65%
  1. Fluoride65%
  2. Nitrate37%
  3. Trihalomethanes27%
  4. Aluminium11%
  5. Nickel5%
  6. Colour4%
  7. Iron3%
  8. Turbidity3%
  9. Antimony3%
  10. Arsenic2%
  11. Manganese2%
  12. Lead1%
  13. Chromium<1%
  14. Nitrite<1%
  15. Selenium<1%
  16. Cadmium<1%
  17. Copper<1%
  • pH 7.39 pH
  • Conductivity 343 µS/cm
  • Phosphate 1.1 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
pH7.39 pHNo legal limit–
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.007 mg/L0.2 mg/L
3%
Manganese0.00086 mg/L0.05 mg/L
2%
Conductivity343 µS/cmNo legal limit–
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
Turbidity0.12 NTU4 NTU
3%
Fluoride0.97 mg/L1.5 mg/L
65%
Arsenic0.00024 mg/L0.01 mg/L
2%
Cadmium0.00001 mg/L0.005 mg/L
<1%
Trihalomethanes0.0267 mg/L0.1 mg/L
27%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.001 mg/L0.02 mg/L
5%
Nitrate18.3 mg/L50 mg/L
37%
Nitrite0.003 mg/L0.5 mg/L
<1%
Copper0.0021 mg/L2 mg/L
<1%
Lead0.00014 mg/L0.01 mg/L
1%
Antimony0.000142 mg/L0.005 mg/L
3%
Selenium0.00009 mg/L0.04 mg/L
<1%
Phosphate1.1 mg/LNo legal limit–
Outside your tap

Your river is the Stour - conf Nethercote Bk to conf Back Bk, rated poor

The Environment Agency rated the Stour - conf Nethercote Bk to conf Back Bk as poor for ecological health in its 2025 assessment, meaning the river is badly affected, with much of the expected wildlife missing. It is held back by fish, water plants and algae and 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. Its ecological rating has dropped since the previous assessment.

None of this is a test of your tap water. Environment Agency record · River health across England

CV36 in short

Tap water in CV36 (Stratford-on-Avon) is supplied by Severn Trent in the Stratford-on-Avon Central zone and scores 9.0 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 19 December 2025.

  • Fluoride is the reading closest to its limit, at 65% of the 1.5 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 5th cleanest of 8 areas tested in Stratford-on-AvonSquarely mid-table for Stratford-on-Avon, between B49 on 9.3 and CV47 on 8.9.
  • Scores higher than 3 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 10CV478.9 out of 10CV379.3 out of 10

Questions about CV36 water

Is CV36 tap water safe to drink?

Based on the latest tests, CV36 (Stratford-on-Avon) water scores 9/10, which is safe. 0 of 20 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in CV36 water?

We tested 20 contaminants in CV36 water. None exceeded recommended safe levels.

Who supplies water in CV36?

CV36 (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 CV36?

CV36 water scored 9/10 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 CV36 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for CV36, 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 CV36?

The Environment Agency rated the Stour - conf Nethercote Bk to conf Back Bk as poor for ecological health in its 2025 assessment, meaning the river is badly affected, with much of the expected wildlife missing. It is held back by fish, water plants and algae and 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. Its ecological rating has dropped since the previous assessment. This is a rating of the river, not of tap water in CV36, 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 CV36

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
pH8.07 pHNone
Temperature13.4 °CNone
Conductivity647 µS/cmNone
Ammonia0.18 mg/L0.5 mg/L
Nitrate6.3 mg/L50 mg/L
Nitrite0.054 mg/L0.5 mg/L
Phosphate0.21 mg/LNone
Dissolved Oxygen9.21 mg/LNone

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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