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tapwater
England and Wales average 9.0

Tap water in S33, High PeakSafe to drink.Moderately soft.

Supplied by Severn Trent. 140 samples, 19 substances, latest on 1 December 2025. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.6 / 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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Basic chlorine and taste improvement on a budget

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What's in a glass of S33 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.

Iron came closest to a limit, at 24% of it. 16 of 16 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.0016 mg/L, <1% of the 2 mg/L limitCopper<1%Selenium: 0.00007 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%Cadmium: 0.00004 mg/L, <1% of the 0.005 mg/L limitCadmium<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%Lead: 0.00014 mg/L, 1% of the 0.01 mg/L limitLead1%Manganese: 0.00119 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%Nickel: 0.0014 mg/L, 7% of the 0.02 mg/L limitNickel7%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: 0.0482 mg/L, 24% of the 0.2 mg/L limitIron24%
  1. Iron24%
  2. Nitrate12%
  3. Aluminium11%
  4. Nickel7%
  5. Colour4%
  6. Fluoride3%
  7. Turbidity3%
  8. Manganese2%
  9. Arsenic1%
  10. Lead1%
  11. Antimony1%
  12. Chromium<1%
  13. Cadmium<1%
  14. Nitrite<1%
  15. Selenium<1%
  16. Copper<1%
  • pH 7.7 pH
  • Conductivity 138 µS/cm
  • Phosphate 1.04 mg/L
All 19 results as a table
SubstanceResultLegal limitShare of limit
pH7.7 pHNo legal limit–
Turbidity0.12 NTU4 NTU
3%
Colour0.8 mg/L Pt/Co20 mg/L Pt/Co
4%
Manganese0.00119 mg/L0.05 mg/L
2%
Aluminium0.021 mg/L0.2 mg/L
11%
Iron0.0482 mg/L0.2 mg/L
24%
Conductivity138 µS/cmNo legal limit–
Copper0.0016 mg/L2 mg/L
<1%
Fluoride0.05 mg/L1.5 mg/L
3%
Arsenic0.00014 mg/L0.01 mg/L
1%
Cadmium0.00004 mg/L0.005 mg/L
<1%
Nitrate5.8 mg/L50 mg/L
12%
Chromium0.00042 mg/L0.05 mg/L
<1%
Nickel0.0014 mg/L0.02 mg/L
7%
Lead0.00014 mg/L0.01 mg/L
1%
Antimony0.000059 mg/L0.005 mg/L
1%
Selenium0.00007 mg/L0.04 mg/L
<1%
Nitrite0.003 mg/L0.5 mg/L
<1%
Phosphate1.04 mg/LNo legal limit–

88mg of limescale minerals in every litre, typical for the S area. S33 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 Peakshole Water Catchment (trib of Noe), rated moderate

The Environment Agency rated the Peakshole Water Catchment (trib of Noe) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by 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.

None of this is a test of your tap water. Environment Agency record · River health across England

S33 in short

Tap water in S33 (High Peak) is supplied by Severn Trent in the High Peak Central zone and scores 9.6 out of 10, against an England and Wales average of 9.0. None of the 19 tested substances came close to a limit. The latest sample is from 1 December 2025.

  • 2nd cleanest of 5 areas tested in High PeakOnly 1 area in High Peak scored higher. The best is SK13 on 9.7.
  • 0.6 points above the national average of 9Cleaner than the typical tested district in the UK. Compare every area
  • Nothing tested came within 40% of its legal limitThe highest was Iron at 24% of the 0.2 mg/L maximum. See every reading

Next door

SK179.4 out of 10 · 47 mg/LSK228.7 out of 10 · 47 mg/LSK239.3 out of 10 · 47 mg/LSK139.7 out of 10 · 47 mg/L

Questions about S33 water

Is S33 tap water safe to drink?

Based on the latest tests, S33 (High Peak) water scores 9.6/10, which is safe. 0 of 19 tested contaminants exceeded recommended levels. Water is supplied by Severn Trent.

What contaminants are in S33 water?

We tested 19 contaminants in S33 water. None exceeded recommended safe levels.

Who supplies water in S33?

S33 (High Peak) is supplied by Severn Trent. You can view their full profile and compliance data on our supplier page.

Is S33 water hard or soft?

No hardness reading has been published for S33 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 S33?

S33 water scored 9.6/10 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 S33 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for S33, 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 S33?

The Environment Agency rated the Peakshole Water Catchment (trib of Noe) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by 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. This is a rating of the river, not of tap water in S33, 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 S33

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
Lead0.011 mg/L0.01 mg/L
pH6.89 pHNone
Temperature15.1 °CNone
Conductivity91 µS/cmNone
Nitrate0.62 mg/L50 mg/L
Dissolved Oxygen9.96 mg/LNone
Ammonia0.074 mg/L0.5 mg/L
Nitrite0.015 mg/L0.5 mg/L
Phosphate0.019 mg/LNone
Cadmium0.00024 mg/L0.005 mg/L
Hardness (as CaCO3)227 mg/LNone
Zinc0.026 mg/LNone
Nickel0.0013 mg/L0.02 mg/L
Copper0.0011 mg/L2 mg/L
Manganese0.014 mg/L0.05 mg/L
Iron0.049 mg/L0.2 mg/L

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We'll email you when water quality data changes for S33.

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