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tapwater
England and Wales average 9.0

Tap water in SK23, High PeakSafe to drink.Soft.

Supplied by Severn Trent. 410 samples, 20 substances, latest on 24 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. The specks are the minerals that make water hard.

What to do about it

ZeroWater 12-Cup Ready-Pour

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Households concerned about PFAS and heavy metals

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Waterdrop 10UA Under Sink

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High-volume under-sink filtration without RO complexity

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BRITA Marella XL + MAXTRA PRO

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Basic chlorine and taste improvement on a budget

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What's in a glass of SK23 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 limitCopper: 0.0032 mg/L, <1% of the 2 mg/L limitCopper<1%Selenium: 0.00009 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%Cadmium: 0.00006 mg/L, 1% of the 0.005 mg/L limitCadmium1%Antimony: 0.000062 mg/L, 1% of the 0.005 mg/L limitAntimony1%Arsenic: 0.00014 mg/L, 1% of the 0.01 mg/L limitArsenic1%Manganese: 0.00079 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%Colour: 0.8 mg/L Pt/Co, 4% of the 20 mg/L Pt/Co limitColour4%Iron: 0.0158 mg/L, 8% of the 0.2 mg/L limitIron8%Nickel: 0.0017 mg/L, 9% of the 0.02 mg/L limitNickel9%Lead: 0.00089 mg/L, 9% of the 0.01 mg/L limitLead9%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%Trihalomethanes: 0.0451 mg/L, 45% of the 0.1 mg/L limitTrihalomethanes45%
  1. Trihalomethanes45%
  2. Nitrate12%
  3. Aluminium11%
  4. Lead9%
  5. Nickel9%
  6. Iron8%
  7. Colour4%
  8. Fluoride3%
  9. Turbidity3%
  10. Manganese2%
  11. Arsenic1%
  12. Antimony1%
  13. Cadmium1%
  14. Chromium<1%
  15. Nitrite<1%
  16. Selenium<1%
  17. Copper<1%
  • pH 7.85 pH
  • Conductivity 136 µS/cm
  • Phosphate 1 mg/L
All 20 results as a table
SubstanceResultLegal limitShare of limit
pH7.85 pHNo legal limit–
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
Turbidity0.12 NTU4 NTU
3%
Manganese0.00079 mg/L0.05 mg/L
2%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.0158 mg/L0.2 mg/L
8%
Conductivity136 µS/cmNo legal limit–
Trihalomethanes0.0451 mg/L0.1 mg/L
45%
Copper0.0032 mg/L2 mg/L
<1%
Fluoride0.05 mg/L1.5 mg/L
3%
Arsenic0.00014 mg/L0.01 mg/L
1%
Cadmium0.00006 mg/L0.005 mg/L
1%
Nitrate5.8 mg/L50 mg/L
12%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nitrite0.003 mg/L0.5 mg/L
<1%
Nickel0.0017 mg/L0.02 mg/L
9%
Lead0.00089 mg/L0.01 mg/L
9%
Antimony0.000062 mg/L0.005 mg/L
1%
Selenium0.00009 mg/L0.04 mg/L
<1%
Phosphate1 mg/LNo legal limit–

47mg of limescale minerals in every litre, typical for the SK area. SK23 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 Randall Carr Brook, rated good

The Environment Agency rated the Randall Carr Brook as good for ecological health in its 2025 assessment, meaning the river is only slightly changed from its natural state. 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

56

forever-chemical detections in nearby rivers and groundwater

At 4 sites. The highest was 6:2 FTSA at 0.0063 µg/L, at SSN1626 Booth Green Brook Near Blakehey Wood, 9.3 km away, in April 2025. These are river and borehole samples, not tests of your tap water.

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

SK23 in short

Tap water in SK23 (High Peak) is supplied by Severn Trent in the High Peak 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 24 December 2025.

  • 4th cleanest of 5 areas tested in High Peak1 area in High Peak scored lower. The best is SK13 on 9.7.
  • 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
  • Soft water at 47 mg/LLimescale is not a problem across the SK postcode area, so skip softeners and scale filters entirely. How hardness is measured

Next door

S339.6 out of 10 · 99 mg/LSK179.4 out of 10 · 47 mg/LSK228.7 out of 10 · 47 mg/LSK139.7 out of 10 · 47 mg/L

Questions about SK23 water

Is SK23 tap water safe to drink?

Based on the latest tests, SK23 (High Peak) 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 SK23 water?

We tested 20 contaminants in SK23 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 SK23?

SK23 (High Peak) is supplied by Severn Trent. You can view their full profile and compliance data on our supplier page.

Is SK23 water hard or soft?

No hardness reading has been published for SK23 itself. Across the SK postcode area the typical value is 47 mg/L CaCO3, which is classified as soft. Soft water is gentle on appliances and skin.

Should I use a water filter in SK23?

SK23 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 SK23 water?

The tap-water tests we hold for SK23 do not include a PFAS result. Environment Agency monitoring found PFAS in 56 river and groundwater samples from 4 sites within 10 km of SK23, the highest being 6:2 FTSA at 0.0063 µg/L about 9.3 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 SK23?

The Environment Agency rated the Randall Carr Brook as good for ecological health in its 2025 assessment, meaning the river is only slightly changed from its natural state. 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 SK23, 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 SK23

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
pH7.34 pHNone
Temperature13.9 °CNone
Conductivity125 µS/cmNone
Nitrate0.65 mg/L50 mg/L
Phosphate0.0021 mg/LNone
Dissolved Oxygen10.4 mg/LNone
Ammonia0.0031 mg/L0.5 mg/L
Nitrite0.0012 mg/L0.5 mg/L

Get alerts for your area

We'll email you when water quality data changes for SK23.

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