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tapwater
England and Wales average 9.0

Tap water in DE45, Derbyshire DalesSafe to drink.

Supplied by Severn Trent. 399 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

9.4 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of DE45 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 37% of it. 16 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: 0.0051 mg/L, <1% of the 2 mg/L limitCopper<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%Antimony: 0.000059 mg/L, 1% of the 0.005 mg/L limitAntimony1%Arsenic: 0.00014 mg/L, 1% of the 0.01 mg/L limitArsenic1%Cadmium: 0.00007 mg/L, 1% of the 0.005 mg/L limitCadmium1%Manganese: 0.00091 mg/L, 2% of the 0.05 mg/L limitManganese2%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Fluoride: 0.05 mg/L, 3% of the 1.5 mg/L limitFluoride3%Iron: 0.0073 mg/L, 4% of the 0.2 mg/L limitIron4%Lead: 0.00038 mg/L, 4% of the 0.01 mg/L limitLead4%Colour: 0.8 mg/L Pt/Co, 4% of the 20 mg/L Pt/Co limitColour4%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%Nickel: 0.0024 mg/L, 12% of the 0.02 mg/L limitNickel12%Trihalomethanes: 0.0374 mg/L, 37% of the 0.1 mg/L limitTrihalomethanes37%
  1. Trihalomethanes37%
  2. Nickel12%
  3. Nitrate12%
  4. Aluminium11%
  5. Colour4%
  6. Lead4%
  7. Iron4%
  8. Fluoride3%
  9. Turbidity3%
  10. Manganese2%
  11. Arsenic1%
  12. Cadmium1%
  13. Antimony1%
  14. Chromium<1%
  15. Nitrite<1%
  16. Copper<1%
  17. Selenium<1%
  • pH 7.56 pH
  • Conductivity 137 µS/cm
  • Phosphate 0.985 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
pH7.56 pHNo legal limit–
Turbidity0.12 NTU4 NTU
3%
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
Manganese0.00091 mg/L0.05 mg/L
2%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.0073 mg/L0.2 mg/L
4%
Conductivity137 µS/cmNo legal limit–
Trihalomethanes0.0374 mg/L0.1 mg/L
37%
Copper0.0051 mg/L2 mg/L
<1%
Fluoride0.05 mg/L1.5 mg/L
3%
Arsenic0.00014 mg/L0.01 mg/L
1%
Nitrate5.8 mg/L50 mg/L
12%
Cadmium0.00007 mg/L0.005 mg/L
1%
Nitrite0.003 mg/L0.5 mg/L
<1%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0024 mg/L0.02 mg/L
12%
Lead0.00038 mg/L0.01 mg/L
4%
Antimony0.000059 mg/L0.005 mg/L
1%
Selenium0.00009 mg/L0.04 mg/L
<1%
Phosphate0.985 mg/LNo legal limit–
Outside your tap

Your river is the Wye from Monk's Dale to Derwent, rated poor

The Environment Agency rated the Wye from Monk's Dale to Derwent 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 and specific pollutants. 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

DE45 in short

Tap water in DE45 (Derbyshire Dales) is supplied by Severn Trent in the Derbyshire Dales Central zone and scores 9.4 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.

  • 3rd cleanest of 4 areas tested in Derbyshire Dales1 area in Derbyshire Dales scored lower. The best is S32 on 9.6.
  • Nothing tested came within 40% of its legal limitThe highest was Trihalomethanes at 37% of the 0.1 mg/L maximum. See every reading
  • Scores higher than 0 of 3 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

DE49.4 out of 10DE69.4 out of 10S329.6 out of 10 · 88 mg/L

Questions about DE45 water

Is DE45 tap water safe to drink?

Based on the latest tests, DE45 (Derbyshire Dales) water scores 9.4/10, which is safe. 0 of 20 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in DE45 water?

We tested 20 contaminants in DE45 water. None exceeded recommended safe levels.

Who supplies water in DE45?

DE45 (Derbyshire Dales) 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 DE45?

DE45 water scored 9.4/10 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 DE45 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for DE45, 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 DE45?

The Environment Agency rated the Wye from Monk's Dale to Derwent 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 and specific pollutants. 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 DE45, 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 DE45

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
Lead0.0099 mg/L0.01 mg/L
Iron0.25 mg/L0.2 mg/L
pH7.9 pHNone
Temperature13.6 °CNone
Conductivity214 µS/cmNone
Cadmium0.0002 mg/L0.005 mg/L
Hardness (as CaCO3)76.4 mg/LNone
Zinc0.013 mg/LNone
Nickel0.0016 mg/L0.02 mg/L
Copper0.0018 mg/L2 mg/L
Manganese0.026 mg/L0.05 mg/L
Nitrate3.5 mg/L50 mg/L
Phosphate0.015 mg/LNone
Dissolved Oxygen11.6 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