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tapwater
England and Wales average 9.0

Tap water in S35, SheffieldSafe to drink.Moderately soft.

Supplied by Yorkshire Water. 1,660 samples, 25 substances, latest on 28 September 2026. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.7 / 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 S35 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 29% of it. 19 of 20 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitChromium: 0.00019 mg/L, <1% of the 0.05 mg/L limitChromium<1%Copper: 0.0102 mg/L, <1% of the 2 mg/L limitCopper<1%Cadmium: 0.000031 mg/L, <1% of the 0.005 mg/L limitCadmium<1%Boron: 0.0089 mg/L, <1% of the 1 mg/L limitBoron<1%Antimony: 0.000049 mg/L, <1% of the 0.005 mg/L limitAntimony<1%Lead: 0.0001 mg/L, 1% of the 0.01 mg/L limitLead1%Selenium: 0.00043 mg/L, 1% of the 0.04 mg/L limitSelenium1%Arsenic: 0.00015 mg/L, 1% of the 0.01 mg/L limitArsenic1%Nitrite: 0.008 mg/L, 2% of the 0.5 mg/L limitNitrite2%Manganese: 0.00101 mg/L, 2% of the 0.05 mg/L limitManganese2%Turbidity: 0.11 NTU, 3% of the 4 NTU limitTurbidity3%Bromate: 0.0003 mg/L, 3% of the 0.01 mg/L limitBromate3%Mercury: 0.00004 mg/L, 4% of the 0.001 mg/L limitMercury4%Fluoride: 0.06 mg/L, 4% of the 1.5 mg/L limitFluoride4%Iron: 0.00826 mg/L, 4% of the 0.2 mg/L limitIron4%Nickel: 0.00087 mg/L, 4% of the 0.02 mg/L limitNickel4%Aluminium: 0.0111 mg/L, 6% of the 0.2 mg/L limitAluminium6%Nitrate: 3.73 mg/L, 7% of the 50 mg/L limitNitrate7%Colour: 3 mg/L Pt/Co, 15% of the 20 mg/L Pt/Co limitColour15%Trihalomethanes: 0.0286 mg/L, 29% of the 0.1 mg/L limitTrihalomethanes29%
  1. Trihalomethanes29%
  2. Colour15%
  3. Nitrate7%
  4. Aluminium6%
  5. Nickel4%
  6. Iron4%
  7. Mercury4%
  8. Fluoride4%
  9. Bromate3%
  10. Turbidity3%
  11. Manganese2%
  12. Nitrite2%
  13. Arsenic1%
  14. Selenium1%
  15. Lead1%
  16. Antimony<1%
  17. Boron<1%
  18. Cadmium<1%
  19. Copper<1%
  20. Chromium<1%
  • Conductivity 195 µS/cm
  • Coliform Bacteria none found
  • E. coli none found
  • Phosphate 1.24 mg/L
All 25 results as a table
SubstanceResultLegal limitShare of limit
Aluminium0.0111 mg/L0.2 mg/L
6%
Colour3 mg/L Pt/Co20 mg/L Pt/Co
15%
Iron0.00826 mg/L0.2 mg/L
4%
Manganese0.00101 mg/L0.05 mg/L
2%
Conductivity195 µS/cmNo legal limit–
Turbidity0.11 NTU4 NTU
3%
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Phosphate1.24 mg/LNo legal limit–
Trihalomethanes0.0286 mg/L0.1 mg/L
29%
Nitrite0.008 mg/L0.5 mg/L
2%
Nitrate3.73 mg/L50 mg/L
7%
Mercury0.00004 mg/L0.001 mg/L
4%
Copper0.0102 mg/L2 mg/L
<1%
Selenium0.00043 mg/L0.04 mg/L
1%
Arsenic0.00015 mg/L0.01 mg/L
1%
Antimony0.000049 mg/L0.005 mg/L
<1%
Lead0.0001 mg/L0.01 mg/L
1%
Bromate0.0003 mg/L0.01 mg/L
3%
Fluoride0.06 mg/L1.5 mg/L
4%
Nickel0.00087 mg/L0.02 mg/L
4%
Chromium0.00019 mg/L0.05 mg/L
<1%
Cadmium0.000031 mg/L0.005 mg/L
<1%
Boron0.0089 mg/L1 mg/L
<1%
Hardness (as CaCO3)137 mg/LNo legal limit–

70mg of limescale minerals in every litre

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 Blackburn Brook from Source to River Don, rated moderate

The Environment Agency rated the Blackburn Brook from Source to River Don 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. 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

81

forever-chemical detections in nearby rivers and groundwater

At 2 sites. The highest was PFOS (total) at 0.38 µg/L, at Hillsborough Golf Club, 5.1 km away, in March 2026. These are river and borehole samples, not tests of your tap water.

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

S35 in short

Tap water in S35 (Sheffield) is supplied by Yorkshire Water in the Sheffield Central zone and scores 9.7 out of 10, against an England and Wales average of 9.0. None of the 25 tested substances came close to a limit. The latest sample is from 28 September 2026.

  • 2nd cleanest of 17 areas tested in SheffieldOnly 1 area in Sheffield scored higher. The best is S20 on 10. Every area in Sheffield
  • 0.7 points above the national average of 9Cleaner than the typical tested district in the UK. Compare every area
  • PFAS found at 2 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was PFOS (total) about 5.1 km away. What was measured

Next door

S109.4 out of 10 · 30 mg/LS89.6 out of 10 · 32 mg/LS69.3 out of 10 · 70 mg/LS119.6 out of 10 · 35 mg/LS79.7 out of 10 · 41 mg/LS19.4 out of 10 · 70 mg/LS29.5 out of 10 · 30 mg/LS39.4 out of 10 · 56 mg/LS59.3 out of 10 · 63 mg/LS139.6 out of 10 · 105 mg/L

Questions about S35 water

Is S35 tap water safe to drink?

Based on the latest tests, S35 (Sheffield) water scores 9.7/10, which is safe. 0 of 25 tested contaminants exceeded recommended levels. Water is supplied by Yorkshire Water.

What contaminants are in S35 water?

We tested 25 contaminants in S35 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 S35?

S35 (Sheffield) is supplied by Yorkshire Water. You can view their full profile and compliance data on our supplier page.

Is S35 water hard or soft?

Water in S35 (Sheffield) has a hardness of 70 mg/L CaCO3, which is classified as moderately soft. This is a moderate hardness level.

Should I use a water filter in S35?

S35 water scored 9.7/10 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 S35 water?

The tap-water tests we hold for S35 do not include a PFAS result. Environment Agency monitoring found PFAS in 81 river and groundwater samples from 2 sites within 10 km of S35, the highest being PFOS (total) at 0.38 µg/L about 5.1 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 S35?

The Environment Agency rated the Blackburn Brook from Source to River Don 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. 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 S35, which is treated before it reaches homes.

Keep reading

PFAS explainedHow to test your waterBest water filtersFilter shower headsWater testing kitsAll of SheffieldUK water rankingsWater hardness checkerWater hardness map

River and groundwater readings near S35

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 pHNone
Temperature16.4 °CNone
Conductivity164 µS/cmNone
Nitrate0.6 mg/L50 mg/L
Phosphate0.018 mg/LNone
Dissolved Oxygen9.74 mg/LNone
Ammonia0.057 mg/L0.5 mg/L
Nitrite0.0262 mg/L0.5 mg/L
Copper0.0028 mg/L2 mg/L
Zinc0.0209 mg/LNone

Get alerts for your area

We'll email you when water quality data changes for S35.

Source: Yorkshire Water 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