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tapwater
England and Wales average 9.0

Tap water in CV9, North WarwickshireSafe to drink.

Supplied by Severn Trent. 808 samples, 20 substances, latest on 17 December 2025. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

8.6 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of CV9 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 71% of it. 14 of 17 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitSelenium: 0.00009 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Copper: 0.007 mg/L, <1% of the 2 mg/L limitCopper<1%Cadmium: 0.00002 mg/L, <1% of the 0.005 mg/L limitCadmium<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%Manganese: 0.00073 mg/L, 1% of the 0.05 mg/L limitManganese1%Arsenic: 0.00025 mg/L, 3% of the 0.01 mg/L limitArsenic3%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Iron: 0.007 mg/L, 3% of the 0.2 mg/L limitIron3%Antimony: 0.000392 mg/L, 8% of the 0.005 mg/L limitAntimony8%Nickel: 0.0016 mg/L, 8% of the 0.02 mg/L limitNickel8%Colour: 1.8 mg/L Pt/Co, 9% of the 20 mg/L Pt/Co limitColour9%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Nitrate: 9 mg/L, 18% of the 50 mg/L limitNitrate18%Lead: 0.00356 mg/L, 36% of the 0.01 mg/L limitLead36%Trihalomethanes: 0.0375 mg/L, 37% of the 0.1 mg/L limitTrihalomethanes37%Fluoride: 1.07 mg/L, 71% of the 1.5 mg/L limitFluoride71%
  1. Fluoride71%
  2. Trihalomethanes37%
  3. Lead36%
  4. Nitrate18%
  5. Aluminium11%
  6. Colour9%
  7. Nickel8%
  8. Antimony8%
  9. Iron3%
  10. Turbidity3%
  11. Arsenic3%
  12. Manganese1%
  13. Chromium<1%
  14. Nitrite<1%
  15. Cadmium<1%
  16. Copper<1%
  17. Selenium<1%
  • pH 7.16 pH
  • Conductivity 411 µS/cm
  • Phosphate 0.941 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
Turbidity0.12 NTU4 NTU
3%
pH7.16 pHNo legal limit–
Colour1.8 mg/L Pt/Co20 mg/L Pt/Co
9%
Antimony0.000392 mg/L0.005 mg/L
8%
Iron0.007 mg/L0.2 mg/L
3%
Selenium0.00009 mg/L0.04 mg/L
<1%
Manganese0.00073 mg/L0.05 mg/L
1%
Copper0.007 mg/L2 mg/L
<1%
Fluoride1.07 mg/L1.5 mg/L
71%
Arsenic0.00025 mg/L0.01 mg/L
3%
Cadmium0.00002 mg/L0.005 mg/L
<1%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0016 mg/L0.02 mg/L
8%
Lead0.00356 mg/L0.01 mg/L
36%
Nitrate9 mg/L50 mg/L
18%
Conductivity411 µS/cmNo legal limit–
Trihalomethanes0.0375 mg/L0.1 mg/L
37%
Nitrite0.003 mg/L0.5 mg/L
<1%
Aluminium0.021 mg/L0.2 mg/L
11%
Phosphate0.941 mg/LNo legal limit–
Outside your tap

Your river is the Anker from River Sence to River Tame, rated poor

The Environment Agency rated the Anker from River Sence to River Tame 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 water plants and algae, phosphate and fish. 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

CV9 in short

Tap water in CV9 (North Warwickshire) is supplied by Severn Trent in the North Warwickshire Central zone and scores 8.6 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 17 December 2025.

  • Fluoride is the reading closest to its limit, at 71% of the 1.5 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • Right on the national average of 9 out of 10Most of the country's tested districts land within half a point of CV9. Compare every area
  • 20 substances checked across 808 samplesResults were collected between January 2025 and December 2025 by Severn Trent.

Next door

B469.3 out of 10

Questions about CV9 water

Is CV9 tap water safe to drink?

Based on the latest tests, CV9 (North Warwickshire) water scores 8.6/10, which is safe. 0 of 20 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in CV9 water?

We tested 20 contaminants in CV9 water. None exceeded recommended safe levels.

Who supplies water in CV9?

CV9 (North Warwickshire) 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 CV9?

CV9 water scored 8.6/10 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 CV9 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for CV9, 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 CV9?

The Environment Agency rated the Anker from River Sence to River Tame 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 water plants and algae, phosphate and fish. 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 CV9, 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 CV9

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
pH8.25 pHNone
Iron0.033 mg/L0.2 mg/L
Temperature14.8 °CNone
Conductivity897 µS/cmNone
Nitrate16 mg/L50 mg/L
Nitrite0.023 mg/L0.5 mg/L
Phosphate0.075 mg/LNone
Dissolved Oxygen13.8 mg/LNone
Ammonia0.17 mg/L0.5 mg/L
Hardness (as CaCO3)336 mg/LNone
Zinc0.013 mg/LNone
Nickel0.0045 mg/L0.02 mg/L
Copper0.0023 mg/L2 mg/L
Lead0.000101 mg/L0.01 mg/L
Cadmium0.0000341 mg/L0.005 mg/L

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We'll email you when water quality data changes for CV9.

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