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tapwater
England and Wales average 9.0

Tap water in CV21, RugbySafe to drink.

Supplied by Severn Trent. 1,252 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

9.0 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of CV21 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 51% of it. 15 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: 0.00013 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: 0.00088 mg/L, 2% of the 0.05 mg/L limitManganese2%Copper: 0.0497 mg/L, 2% of the 2 mg/L limitCopper2%Antimony: 0.000133 mg/L, 3% of the 0.005 mg/L limitAntimony3%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Arsenic: 0.00035 mg/L, 3% of the 0.01 mg/L limitArsenic3%Colour: 1.5 mg/L Pt/Co, 8% of the 20 mg/L Pt/Co limitColour8%Nickel: 0.0018 mg/L, 9% of the 0.02 mg/L limitNickel9%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Nitrate: 5.8 mg/L, 12% of the 50 mg/L limitNitrate12%Iron: 0.0339 mg/L, 17% of the 0.2 mg/L limitIron17%Trihalomethanes: 0.0423 mg/L, 42% of the 0.1 mg/L limitTrihalomethanes42%Fluoride: 0.77 mg/L, 51% of the 1.5 mg/L limitFluoride51%
  1. Fluoride51%
  2. Trihalomethanes42%
  3. Iron17%
  4. Nitrate12%
  5. Aluminium11%
  6. Nickel9%
  7. Colour8%
  8. Arsenic3%
  9. Turbidity3%
  10. Antimony3%
  11. Copper2%
  12. Manganese2%
  13. Lead1%
  14. Chromium<1%
  15. Nitrite<1%
  16. Selenium<1%
  17. Cadmium<1%
  • pH 7.4 pH
  • Conductivity 531 µS/cm
  • Phosphate 0.391 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
Colour1.5 mg/L Pt/Co20 mg/L Pt/Co
8%
Turbidity0.12 NTU4 NTU
3%
pH7.4 pHNo legal limit–
Manganese0.00088 mg/L0.05 mg/L
2%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.0339 mg/L0.2 mg/L
17%
Nitrate5.8 mg/L50 mg/L
12%
Copper0.0497 mg/L2 mg/L
2%
Nitrite0.003 mg/L0.5 mg/L
<1%
Fluoride0.77 mg/L1.5 mg/L
51%
Arsenic0.00035 mg/L0.01 mg/L
3%
Cadmium0.00001 mg/L0.005 mg/L
<1%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0018 mg/L0.02 mg/L
9%
Lead0.00014 mg/L0.01 mg/L
1%
Antimony0.000133 mg/L0.005 mg/L
3%
Selenium0.00013 mg/L0.04 mg/L
<1%
Conductivity531 µS/cmNo legal limit–
Trihalomethanes0.0423 mg/L0.1 mg/L
42%
Phosphate0.391 mg/LNo legal limit–
Outside your tap

Your river is the Avon - ClaycotonYelvertoft Bk to conf R Sowe, rated moderate

The Environment Agency rated the Avon - ClaycotonYelvertoft Bk to conf R Sowe 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

Within 10 km

22

forever-chemical detections in nearby rivers and groundwater

At 1 site. The highest was PFBA at 0.0044 µg/L, at Draycote Stream D/S Draycote Reservoir, 8.8 km away, in June 2023. These are river and borehole samples, not tests of your tap water.

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

CV21 in short

Tap water in CV21 (Rugby) is supplied by Severn Trent in the Rugby 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 22 December 2025.

  • Fluoride is the reading closest to its limit, at 51% of the 1.5 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 2nd cleanest of 3 areas tested in RugbySquarely mid-table for Rugby, between CV23 on 9.1 and CV22 on 8.9.
  • PFAS found at 1 monitoring site within 10 kmThose are river and groundwater samples, not tap water. The highest was PFBA about 8.8 km away. What was measured

Next door

CV239.1 out of 10CV228.9 out of 10

Questions about CV21 water

Is CV21 tap water safe to drink?

Based on the latest tests, CV21 (Rugby) 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 CV21 water?

We tested 20 contaminants in CV21 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 CV21?

CV21 (Rugby) 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 CV21?

CV21 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 CV21 water?

The tap-water tests we hold for CV21 do not include a PFAS result. Environment Agency monitoring found PFAS in 22 river and groundwater samples from 1 sites within 10 km of CV21, the highest being PFBA at 0.0044 µg/L about 8.8 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 CV21?

The Environment Agency rated the Avon - ClaycotonYelvertoft Bk to conf R Sowe 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 CV21, 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 CV21

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
pH8.03 pHNone
Temperature8.7 °CNone
Conductivity573 µS/cmNone
Nitrate4.4 mg/L50 mg/L
Nitrite0.022 mg/L0.5 mg/L
Phosphate0.091 mg/LNone
Dissolved Oxygen10.8 mg/LNone
Ammonia0.083 mg/L0.5 mg/L
Hardness (as CaCO3)321 mg/LNone
Copper0.00281 mg/L2 mg/L
Zinc0.0123 mg/LNone

Get alerts for your area

We'll email you when water quality data changes for CV21.

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