Tap water in S41, Chesterfield2 results are over the limit.Moderately soft.
Supplied by Unknown. 14 substances, latest on 3 March 2020. Lead and Iron came in above the legal limit. Everything else passed.
7.1 / 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 lead, the result that stood out in S41.
Osmio PRO-III Ultimate Whole House
£499typical price
Removes lead, the result that stood out in S41.
Doulton HIP Ultracarb
£120typical price
Removes lead, the result that stood out in S41.
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What's in a glass of S41 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 is over its legal limit, at 154% of it.
- Iron154%
- Lead113%
- Ammonia8%
- Nitrate6%
- Aluminium5%
- Nitrite1%
- Copper<1%
- pH 7.91 pH
- Temperature 5 °C
- Conductivity 373 µS/cm
- Phosphate 0.032 mg/L
- Dissolved Oxygen 12.8 mg/L
- Zinc 0.00502 mg/L
All 14 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Lead | 0.0113 mg/L | 0.01 mg/L | 113% |
| Iron | 0.308 mg/L | 0.2 mg/L | 154% |
| pH | 7.91 pH | No legal limit | – |
| Temperature | 5 °C | No legal limit | – |
| Conductivity | 373 µS/cm | No legal limit | – |
| Ammonia | 0.042 mg/L | 0.5 mg/L | 8% |
| Nitrate | 2.9 mg/L | 50 mg/L | 6% |
| Nitrite | 0.0052 mg/L | 0.5 mg/L | 1% |
| Phosphate | 0.032 mg/L | No legal limit | – |
| Dissolved Oxygen | 12.8 mg/L | No legal limit | – |
| Hardness (as CaCO3) | 172 mg/L | No legal limit | – |
| Aluminium | 0.0102 mg/L | 0.2 mg/L | 5% |
| Copper | 0.00139 mg/L | 2 mg/L | <1% |
| Zinc | 0.00502 mg/L | No legal limit | – |
88mg of limescale minerals in every litre, typical for the S area. S41 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.
Your river is the Rother, Spittal Brook to Doe Lea, rated moderate
The Environment Agency rated the Rother, Spittal Brook to Doe Lea as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by phosphate and water plants and algae. 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
17
forever-chemical detections in nearby rivers and groundwater
At 2 sites. The highest was PFOS (linear) at 0.011 µg/L, at Abbeydale Golf Club, 9.9 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
S41 in short
Tap water in S41 (Chesterfield) is supplied by Unknown in the Chesterfield Central zone and scores 7.1 out of 10, against an England and Wales average of 9.0. 2 of 14 tested substances were close to or over a limit. The latest sample is from 3 March 2020.
- The newest sample here is from March 2020That is over 6 years old, so treat this page as a record of past results rather than today's tap water.
- Iron was measured at 0.31 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 3 areas tested in ChesterfieldS41 scores 7.1 out of 10. The best in Chesterfield, S43, scores 9.5.
Questions about S41 water
Is S41 tap water safe to drink?
Based on the latest tests, S41 (Chesterfield) water scores 7.1/10, which is safe. 2 of 14 tested contaminants exceeded recommended levels. Water is supplied by Unknown.
What contaminants are in S41 water?
We tested 14 contaminants in S41 water. 2 were flagged, including Lead, Iron. 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 S41?
S41 (Chesterfield) is supplied by Unknown. You can view their full profile and compliance data on our supplier page.
Is S41 water hard or soft?
No hardness reading has been published for S41 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 S41?
With 2 contaminants above recommended levels in S41, 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 S41 water?
The tap-water tests we hold for S41 do not include a PFAS result. Environment Agency monitoring found PFAS in 17 river and groundwater samples from 2 sites within 10 km of S41, the highest being PFOS (linear) at 0.011 µg/L about 9.9 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 S41?
The Environment Agency rated the Rother, Spittal Brook to Doe Lea as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by phosphate and water plants and algae. 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 S41, 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
- Lead Pipes in the UKHow to check for lead pipes and reduce exposure
- Best Water Filters UKEvery filter type compared on what it actually removes
PFAS explainedLead in waterHow to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
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