Tap water in S66, RotherhamNitrite is over the limit.Very hard.
Supplied by Yorkshire Water. 1,258 samples, 25 substances, latest on 25 September 2026. Nitrite came in above the legal limit. Everything else passed.
8.6 / 10
The tank is as full as the score. The specks are the minerals that make water hard.
What to do about it
Waterdrop G3P600 Reverse Osmosis
£550typical price
Removes nitrate, the result that stood out in S66.
Stop the limescale
At 266 mg/L a softener is the only thing that stops limescale. Filters do not soften water.
Osmio PRO-III Ultimate Whole House
£499typical price
Removes nitrate, the result that stood out in S66.
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What's in a glass of S66 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.
Nitrite is over its legal limit, at 154% of it.
- Nitrite154%
- Nitrate77%
- Trihalomethanes42%
- Bromate22%
- Colour15%
- Turbidity6%
- Aluminium6%
- Fluoride5%
- Nickel4%
- Mercury4%
- Iron3%
- Arsenic3%
- Boron2%
- Manganese2%
- Antimony2%
- Selenium1%
- Lead<1%
- Cadmium<1%
- Copper<1%
- Chromium<1%
- E. coli none found
- Coliform Bacteria none found
- Conductivity 609 µS/cm
- Phosphate 1.11 mg/L
All 25 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Nitrate | 38.7 mg/L | 50 mg/L | 77% |
| Nitrite | 0.77 mg/L | 0.5 mg/L | 154% |
| E. coli | 0 count/100ml | Must be zero | None found |
| Coliform Bacteria | 0 count/100ml | Must be zero | None found |
| Conductivity | 609 µS/cm | No legal limit | – |
| Turbidity | 0.23 NTU | 4 NTU | 6% |
| Colour | 3 mg/L Pt/Co | 20 mg/L Pt/Co | 15% |
| Aluminium | 0.0111 mg/L | 0.2 mg/L | 6% |
| Iron | 0.00629 mg/L | 0.2 mg/L | 3% |
| Manganese | 0.00101 mg/L | 0.05 mg/L | 2% |
| Phosphate | 1.11 mg/L | No legal limit | – |
| Mercury | 0.00004 mg/L | 0.001 mg/L | 4% |
| Chromium | 0.00019 mg/L | 0.05 mg/L | <1% |
| Copper | 0.0122 mg/L | 2 mg/L | <1% |
| Cadmium | 0.000031 mg/L | 0.005 mg/L | <1% |
| Boron | 0.0243 mg/L | 1 mg/L | 2% |
| Nickel | 0.00082 mg/L | 0.02 mg/L | 4% |
| Lead | 0.00009 mg/L | 0.01 mg/L | <1% |
| Trihalomethanes | 0.0416 mg/L | 0.1 mg/L | 42% |
| Selenium | 0.00043 mg/L | 0.04 mg/L | 1% |
| Arsenic | 0.00025 mg/L | 0.01 mg/L | 3% |
| Antimony | 0.000081 mg/L | 0.005 mg/L | 2% |
| Fluoride | 0.07 mg/L | 1.5 mg/L | 5% |
| Bromate | 0.0022 mg/L | 0.01 mg/L | 22% |
| Hardness (as CaCO3) | 239 mg/L | No legal limit | – |
266mg of limescale minerals in every litre
This is the water that furs up kettles
Very hard on the UK scale. It is fine to drink. It is hard on boilers, showers, skin and anything that heats water, and a jug or tap filter will not change that.
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Your river is the Oldcotes Dyke Catchment (trib of Ryton), rated poor
The Environment Agency rated the Oldcotes Dyke Catchment (trib of Ryton) 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, phosphate and 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
21
forever-chemical detections in nearby rivers and groundwater
At 2 sites. The highest was PFBS at 0.0093 µg/L, at RSN1844 River Don at Eastwood Lock, 6.7 km away, in June 2024. These are river and borehole samples, not tests of your tap water.
Every PFAS sample around Sheffield · Which filters remove PFAS · PFAS explained
S66 in short
Tap water in S66 (Rotherham) is supplied by Yorkshire Water in the Rotherham Central zone and scores 8.6 out of 10, against an England and Wales average of 9.0. 2 of 25 tested substances were close to or over a limit. The latest sample is from 25 September 2026.
- Nitrite was measured at 0.77 mg/L, 54% over the UK limitIt is the furthest over its limit of the 2 substances flagged here. See the full results
- The lowest score of the 8 areas tested in RotherhamS66 scores 8.6 out of 10. The best in Rotherham, S61, scores 9.4.
- Every one of the 7 neighbouring districts scores higherS61 next door scores 9.4, against 8.6 here. Supply zones, not distance, explain the gap. See S61
Questions about S66 water
Is S66 tap water safe to drink?
Based on the latest tests, S66 (Rotherham) water scores 8.6/10, which is safe. 2 of 25 tested contaminants exceeded recommended levels. Water is supplied by Yorkshire Water.
What contaminants are in S66 water?
We tested 25 contaminants in S66 water. 2 were flagged, including Nitrate, Nitrite. 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 S66?
S66 (Rotherham) is supplied by Yorkshire Water. You can view their full profile and compliance data on our supplier page.
Is S66 water hard or soft?
Water in S66 (Rotherham) has a hardness of 266 mg/L CaCO3, which is classified as very hard. Hard water can cause limescale buildup. A water softener or filter jug may help.
Should I use a water filter in S66?
With 2 contaminants above recommended levels in S66, a water filter could help. A reverse osmosis or activated carbon filter is recommended for PFAS removal. See our filter recommendations for your area.
Are there PFAS forever chemicals in S66 water?
The tap-water tests we hold for S66 do not include a PFAS result. Environment Agency monitoring found PFAS in 21 river and groundwater samples from 2 sites within 10 km of S66, the highest being PFBS at 0.0093 µg/L about 6.7 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 S66?
The Environment Agency rated the Oldcotes Dyke Catchment (trib of Ryton) 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, phosphate and 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 S66, which is treated before it reaches homes.
Keep reading
- Best Filter for PFAS RemovalThe filters with independent certification to remove forever chemicals
- PFAS Forever ChemicalsWhat PFAS are and how to reduce your exposure at home
- Best Water Softener UKHarvey, Kinetico, BWT, Monarch and Water2Buy compared, with real costs
- Do I Need a Water Softener?The hardness bands, the symptoms, and a postcode check
- UK Water Hardness MapIs your water hard or soft, and does it matter?
- Best Water Filters UKEvery filter type compared on what it actually removes
- Do I need a water softener?The hardness bands, the symptoms, and when the answer is no
- Best water softener UKHarvey, Kinetico, BWT, Monarch and Water2Buy compared
- Water softener costUnit, fitting and salt, and how long the payback takes
- Installation explainedWhere it goes, the bypass tap, the drain, DIY or plumber
- Harvey vs KineticoThe two premium twin-cylinder brands, side by side
- Softener salt guideTablet, block or granular, and how much you get through
- Salt-free softenersConditioners and electronic descalers, honestly assessed
PFAS explainedNitrate levelsHow to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
River and groundwater readings near S66
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.
| Substance | Reading | Drinking water limit |
|---|---|---|
| Iron | 0.457 mg/L | 0.2 mg/L |
| pH | 7.92 pH | None |
| Temperature | 15.3 °C | None |
| Ammonia | 0.29 mg/L | 0.5 mg/L |
| Nitrate | 22 mg/L | 50 mg/L |
| Nitrite | 0.23 mg/L | 0.5 mg/L |
| Phosphate | 0.053 mg/L | None |
| Dissolved Oxygen | 8.05 mg/L | None |
| Conductivity | 833 µS/cm | None |
| Aluminium | 0.0394 mg/L | 0.2 mg/L |
| Copper | 0.00322 mg/L | 2 mg/L |
| Zinc | 0.0257 mg/L | None |
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