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tapwater
England and Wales average 9.0

Tap water in S45, North East DerbyshireSafe to drink.Moderately soft.

Supplied by Severn Trent. 563 samples, 20 substances, latest on 11 December 2025. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.1 / 10

The tank is as full as the score. The specks are the minerals that make water hard.

What to do about it

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Households concerned about PFAS and heavy metals

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High-volume under-sink filtration without RO complexity

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Basic chlorine and taste improvement on a budget

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What's in a glass of S45 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 35% of it. 14 of 17 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitNitrite: 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%Selenium: 0.00037 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Cadmium: 0.00007 mg/L, 1% of the 0.005 mg/L limitCadmium1%Manganese: 0.00073 mg/L, 1% of the 0.05 mg/L limitManganese1%Arsenic: 0.0002 mg/L, 2% of the 0.01 mg/L limitArsenic2%Lead: 0.00028 mg/L, 3% of the 0.01 mg/L limitLead3%Turbidity: 0.12 NTU, 3% of the 4 NTU limitTurbidity3%Iron: 0.007 mg/L, 3% of the 0.2 mg/L limitIron3%Antimony: 0.000219 mg/L, 4% of the 0.005 mg/L limitAntimony4%Colour: 1.6 mg/L Pt/Co, 8% of the 20 mg/L Pt/Co limitColour8%Copper: 0.163 mg/L, 8% of the 2 mg/L limitCopper8%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%Fluoride: 0.41 mg/L, 27% of the 1.5 mg/L limitFluoride27%Nickel: 0.0055 mg/L, 27% of the 0.02 mg/L limitNickel27%Trihalomethanes: 0.0353 mg/L, 35% of the 0.1 mg/L limitTrihalomethanes35%
  1. Trihalomethanes35%
  2. Nickel27%
  3. Fluoride27%
  4. Nitrate12%
  5. Aluminium11%
  6. Copper8%
  7. Colour8%
  8. Antimony4%
  9. Iron3%
  10. Turbidity3%
  11. Lead3%
  12. Arsenic2%
  13. Manganese1%
  14. Cadmium1%
  15. Selenium<1%
  16. Chromium<1%
  17. Nitrite<1%
  • pH 7.55 pH
  • Conductivity 302 µS/cm
  • Phosphate 0.952 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
pH7.55 pHNo legal limit–
Colour1.6 mg/L Pt/Co20 mg/L Pt/Co
8%
Turbidity0.12 NTU4 NTU
3%
Iron0.007 mg/L0.2 mg/L
3%
Manganese0.00073 mg/L0.05 mg/L
1%
Conductivity302 µS/cmNo legal limit–
Aluminium0.021 mg/L0.2 mg/L
11%
Nitrate5.8 mg/L50 mg/L
12%
Nitrite0.003 mg/L0.5 mg/L
<1%
Copper0.163 mg/L2 mg/L
8%
Fluoride0.41 mg/L1.5 mg/L
27%
Arsenic0.0002 mg/L0.01 mg/L
2%
Cadmium0.00007 mg/L0.005 mg/L
1%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0055 mg/L0.02 mg/L
27%
Lead0.00028 mg/L0.01 mg/L
3%
Antimony0.000219 mg/L0.005 mg/L
4%
Selenium0.00037 mg/L0.04 mg/L
<1%
Trihalomethanes0.0353 mg/L0.1 mg/L
35%
Phosphate0.952 mg/LNo legal limit–

88mg of limescale minerals in every litre, typical for the S area. S45 has no reading of its own.

Soft water. Kind to kettles, boilers and skin

You will not need a softener here, and you will use less soap and detergent than most of England.

Soft400 mg/L
Outside your tap

Your river is the Press Brook Catchment (trib of Amber), rated moderate

The Environment Agency rated the Press Brook Catchment (trib of Amber) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by insects and other small river life and organic pollution (bod). 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

S45 in short

Tap water in S45 (North East Derbyshire) is supplied by Severn Trent in the North East Derbyshire Central zone and scores 9.1 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 11 December 2025.

  • The lowest score of the 4 areas tested in North East DerbyshireS45 scores 9.1 out of 10. The best in North East Derbyshire, S18, scores 9.4.
  • Nothing tested came within 40% of its legal limitThe highest was Trihalomethanes at 35% of the 0.1 mg/L maximum. See every reading
  • Moderately soft water at 88 mg/LLittle limescale to speak of across the S postcode area. A softener would be money wasted. How hardness is measured

Next door

S189.4 out of 10 · 88 mg/LS219.2 out of 10 · 88 mg/LS429.1 out of 10 · 88 mg/L

Questions about S45 water

Is S45 tap water safe to drink?

Based on the latest tests, S45 (North East Derbyshire) water scores 9.1/10, which is safe. 0 of 20 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in S45 water?

We tested 20 contaminants in S45 water. None exceeded recommended safe levels.

Who supplies water in S45?

S45 (North East Derbyshire) is supplied by Severn Trent. You can view their full profile and compliance data on our supplier page.

Is S45 water hard or soft?

No hardness reading has been published for S45 itself. Across the S postcode area the typical value is 88 mg/L CaCO3, which is classified as moderately soft. This is a moderate hardness level.

Should I use a water filter in S45?

S45 water scored 9.1/10 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 S45 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for S45, 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 S45?

The Environment Agency rated the Press Brook Catchment (trib of Amber) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by insects and other small river life and organic pollution (bod). 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 S45, 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 S45

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
Iron0.57 mg/L0.2 mg/L
Manganese0.0408 mg/L0.05 mg/L
pH7.61 pHNone
Temperature16.4 °CNone
Nitrate2.4 mg/L50 mg/L
Phosphate0.089 mg/LNone
Dissolved Oxygen9.08 mg/LNone
Nitrite0.0071 mg/L0.5 mg/L
Lead0.0058 mg/L0.01 mg/L
Cadmium0.00077 mg/L0.005 mg/L
Hardness (as CaCO3)119 mg/LNone
Zinc0.0906 mg/LNone
Nickel0.00447 mg/L0.02 mg/L
Aluminium0.0308 mg/L0.2 mg/L

Get alerts for your area

We'll email you when water quality data changes for S45.

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