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tapwater
England and Wales average 9.0

Tap water in CV31, WarwickSafe to drink.

Supplied by Severn Trent. 1,246 samples, 20 substances, latest on 22 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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Basic chlorine and taste improvement on a budget

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What's in a glass of CV31 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 23% of it. 17 of 17 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.0038 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%Chromium: 0.00042 mg/L, <1% of the 0.05 mg/L limitChromium<1%Antimony: 0.000068 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%Nitrite: 0.013 mg/L, 3% of the 0.5 mg/L limitNitrite3%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%Nitrate: 7.3 mg/L, 15% of the 50 mg/L limitNitrate15%Arsenic: 0.00153 mg/L, 15% of the 0.01 mg/L limitArsenic15%Trihalomethanes: 0.0174 mg/L, 17% of the 0.1 mg/L limitTrihalomethanes17%Fluoride: 0.34 mg/L, 23% of the 1.5 mg/L limitFluoride23%
  1. Fluoride23%
  2. Trihalomethanes17%
  3. Arsenic15%
  4. Nitrate15%
  5. Aluminium11%
  6. Nickel5%
  7. Colour4%
  8. Iron3%
  9. Turbidity3%
  10. Nitrite3%
  11. Manganese1%
  12. Lead1%
  13. Antimony1%
  14. Chromium<1%
  15. Selenium<1%
  16. Cadmium<1%
  17. Copper<1%
  • pH 7.37 pH
  • Conductivity 636 µS/cm
  • Phosphate 1.14 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
Aluminium0.021 mg/L0.2 mg/L
11%
Nitrite0.013 mg/L0.5 mg/L
3%
Iron0.007 mg/L0.2 mg/L
3%
Turbidity0.12 NTU4 NTU
3%
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
pH7.37 pHNo legal limit–
Manganese0.00073 mg/L0.05 mg/L
1%
Copper0.0038 mg/L2 mg/L
<1%
Nitrate7.3 mg/L50 mg/L
15%
Fluoride0.34 mg/L1.5 mg/L
23%
Arsenic0.00153 mg/L0.01 mg/L
15%
Cadmium0.00001 mg/L0.005 mg/L
<1%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.001 mg/L0.02 mg/L
5%
Lead0.00014 mg/L0.01 mg/L
1%
Antimony0.000068 mg/L0.005 mg/L
1%
Selenium0.00009 mg/L0.04 mg/L
<1%
Trihalomethanes0.0174 mg/L0.1 mg/L
17%
Conductivity636 µS/cmNo legal limit–
Phosphate1.14 mg/LNo legal limit–
Outside your tap

Your river is the Avon (Wark) conf R Leam to Tramway Br, Stratford, rated moderate

The Environment Agency rated the Avon (Wark) conf R Leam to Tramway Br, Stratford as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by 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.

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

Within 10 km

172

forever-chemical detections in nearby rivers and groundwater

At 6 sites. The highest was 6:2 FTSA at 0.015 µg/L, at Kenilworth Golf Club Borehole T34/8, 8.3 km away, in June 2025. These are river and borehole samples, not tests of your tap water.

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

CV31 in short

Tap water in CV31 (Warwick) is supplied by Severn Trent in the Warwick 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 22 December 2025.

  • The cleanest tap water of the 6 areas tested in WarwickCV31 scores 9.3 out of 10, ahead of CV32 in second place on 9.1.
  • Scores higher than all 5 neighbouring districtsThe nearest rival is CV32 on 9.1, against 9.3 here. Compare with CV32
  • PFAS found at 6 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was 6:2 FTSA about 8.3 km away. What was measured

Next door

CV329.1 out of 10CV349.1 out of 10CV89.0 out of 10CV358.7 out of 10CV338.8 out of 10

Questions about CV31 water

Is CV31 tap water safe to drink?

Based on the latest tests, CV31 (Warwick) 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 CV31 water?

We tested 20 contaminants in CV31 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 CV31?

CV31 (Warwick) 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 CV31?

CV31 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 CV31 water?

The tap-water tests we hold for CV31 do not include a PFAS result. Environment Agency monitoring found PFAS in 172 river and groundwater samples from 6 sites within 10 km of CV31, the highest being 6:2 FTSA at 0.015 µg/L about 8.3 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 CV31?

The Environment Agency rated the Avon (Wark) conf R Leam to Tramway Br, Stratford as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by 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. This is a rating of the river, not of tap water in CV31, which is treated before it reaches homes.

Keep reading

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

River and groundwater readings near CV31

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
pH8.14 pHNone
Temperature14.1 °CNone
Conductivity1151 µS/cmNone
Nitrate9.6 mg/L50 mg/L
Nitrite0.0057 mg/L0.5 mg/L
Phosphate0.17 mg/LNone
Dissolved Oxygen9.15 mg/LNone
Ammonia0.17 mg/L0.5 mg/L
Lead0.000916 mg/L0.01 mg/L
Hardness (as CaCO3)314 mg/LNone
Chromium0.00111 mg/L0.05 mg/L
Nickel0.0116 mg/L0.02 mg/L
Copper0.00487 mg/L2 mg/L
Zinc0.0318 mg/LNone

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We'll email you when water quality data changes for CV31.

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