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tapwater
England and Wales average 9.0

Tap water in DE11, South DerbyshireSafe to drink.

Supplied by Severn Trent. 936 samples, 20 substances, latest on 20 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 DE11 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.

Trihalomethanes came closest to a limit, at 45% of it. 16 of 17 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitChromium: 0.00042 mg/L, <1% of the 0.05 mg/L limitChromium<1%Selenium: 0.00042 mg/L, 1% of the 0.04 mg/L limitSelenium1%Arsenic: 0.00014 mg/L, 1% of the 0.01 mg/L limitArsenic1%Manganese: 0.00073 mg/L, 1% of the 0.05 mg/L limitManganese1%Lead: 0.00015 mg/L, 1% of the 0.01 mg/L limitLead1%Antimony: 0.00008 mg/L, 2% of the 0.005 mg/L limitAntimony2%Copper: 0.046 mg/L, 2% of the 2 mg/L limitCopper2%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%Cadmium: 0.00031 mg/L, 6% of the 0.005 mg/L limitCadmium6%Nickel: 0.0021 mg/L, 11% of the 0.02 mg/L limitNickel11%Aluminium: 0.021 mg/L, 11% of the 0.2 mg/L limitAluminium11%Fluoride: 0.16 mg/L, 11% of the 1.5 mg/L limitFluoride11%Colour: 2.6 mg/L Pt/Co, 13% of the 20 mg/L Pt/Co limitColour13%Nitrate: 7.3 mg/L, 15% of the 50 mg/L limitNitrate15%Trihalomethanes: 0.0453 mg/L, 45% of the 0.1 mg/L limitTrihalomethanes45%
  1. Trihalomethanes45%
  2. Nitrate15%
  3. Colour13%
  4. Fluoride11%
  5. Nickel11%
  6. Aluminium11%
  7. Cadmium6%
  8. Iron3%
  9. Turbidity3%
  10. Nitrite3%
  11. Copper2%
  12. Antimony2%
  13. Lead1%
  14. Manganese1%
  15. Arsenic1%
  16. Selenium1%
  17. Chromium<1%
  • Conductivity 473 µS/cm
  • pH 7.21 pH
  • Phosphate 0.985 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
Conductivity473 µS/cmNo legal limit–
Trihalomethanes0.0453 mg/L0.1 mg/L
45%
Lead0.00015 mg/L0.01 mg/L
1%
Antimony0.00008 mg/L0.005 mg/L
2%
Selenium0.00042 mg/L0.04 mg/L
1%
pH7.21 pHNo legal limit–
Nitrate7.3 mg/L50 mg/L
15%
Nitrite0.013 mg/L0.5 mg/L
3%
Colour2.6 mg/L Pt/Co20 mg/L Pt/Co
13%
Turbidity0.12 NTU4 NTU
3%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.007 mg/L0.2 mg/L
3%
Manganese0.00073 mg/L0.05 mg/L
1%
Copper0.046 mg/L2 mg/L
2%
Fluoride0.16 mg/L1.5 mg/L
11%
Arsenic0.00014 mg/L0.01 mg/L
1%
Cadmium0.00031 mg/L0.005 mg/L
6%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0021 mg/L0.02 mg/L
11%
Phosphate0.985 mg/LNo legal limit–
Outside your tap

Your river is the Darklands Brook Catchment (trib of Trent), rated moderate

The Environment Agency rated the Darklands Brook Catchment (trib of Trent) 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, insects and other small river life and water plants and algae. 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

106

forever-chemical detections in nearby rivers and groundwater

At 6 sites. The highest was 6:2 FTSA at 0.35 µg/L, at Non-Tidal River Trent at Willington, 8.4 km away, in July 2025. These are river and borehole samples, not tests of your tap water.

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

DE11 in short

Tap water in DE11 (South Derbyshire) is supplied by Severn Trent in the South Derbyshire 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 20 December 2025.

  • Trihalomethanes is the reading closest to its limit, at 45% of the 0.1 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 2nd cleanest of 4 areas tested in South DerbyshireOnly 1 area in South Derbyshire scored higher. The best is DE65 on 9.5.
  • PFAS found at 6 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was 6:2 FTSA about 8.4 km away. What was measured

Next door

DE659.5 out of 10DE739.2 out of 10DE128.7 out of 10

Questions about DE11 water

Is DE11 tap water safe to drink?

Based on the latest tests, DE11 (South Derbyshire) 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 DE11 water?

We tested 20 contaminants in DE11 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 DE11?

DE11 (South Derbyshire) 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 DE11?

DE11 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 DE11 water?

The tap-water tests we hold for DE11 do not include a PFAS result. Environment Agency monitoring found PFAS in 106 river and groundwater samples from 6 sites within 10 km of DE11, the highest being 6:2 FTSA at 0.35 µg/L about 8.4 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 DE11?

The Environment Agency rated the Darklands Brook Catchment (trib of Trent) 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, insects and other small river life and water plants and algae. 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 DE11, 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 DE11

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
pH8.26 pHNone
Temperature8 °CNone
Conductivity557 µS/cmNone
Nitrate4 mg/L50 mg/L
Nitrite0.019 mg/L0.5 mg/L
Phosphate0.056 mg/LNone
Dissolved Oxygen11.4 mg/LNone
Ammonia0.23 mg/L0.5 mg/L
Copper0.0269 mg/L2 mg/L
Zinc0.0176 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