Tap water in S43, ChesterfieldToo few tap tests to call it.Moderately soft.
Supplied by Unknown. 11 substances, latest on 7 March 2025. These are river and groundwater samples near S43, not tests of treated tap water, so treat the score as a rough guide.
9.5 / 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
£40typical price
Households concerned about PFAS and heavy metals
Waterdrop 10UA Under Sink
£70typical price
High-volume under-sink filtration without RO complexity
BRITA Marella XL + MAXTRA PRO
£25typical price
Basic chlorine and taste improvement on a budget
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What's in a glass of S43 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.
Ammonia came closest to a limit, at 14% of it. 5 of 5 substances used under a quarter of theirs.
- Ammonia14%
- Nitrate7%
- Nitrite3%
- Mercury2%
- Copper<1%
- pH 8.63 pH
- Temperature 10.3 °C
- Conductivity 1033 µS/cm
- Dissolved Oxygen 12.5 mg/L
- Phosphate 0.088 mg/L
- Zinc 0.0114 mg/L
All 11 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| pH | 8.63 pH | No legal limit | – |
| Temperature | 10.3 °C | No legal limit | – |
| Conductivity | 1033 µS/cm | No legal limit | – |
| Nitrate | 3.5 mg/L | 50 mg/L | 7% |
| Nitrite | 0.017 mg/L | 0.5 mg/L | 3% |
| Dissolved Oxygen | 12.5 mg/L | No legal limit | – |
| Ammonia | 0.07 mg/L | 0.5 mg/L | 14% |
| Phosphate | 0.088 mg/L | No legal limit | – |
| Mercury | 0.00002 mg/L | 0.001 mg/L | 2% |
| Copper | 0.00603 mg/L | 2 mg/L | <1% |
| Zinc | 0.0114 mg/L | No legal limit | – |
88mg of limescale minerals in every litre, typical for the S area. S43 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 Doe Lea from Hawke Brooke to River Rother, rated moderate
The Environment Agency rated the Doe Lea from Hawke Brooke to River Rother 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 fish. 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
S43 in short
Tap water in S43 (Chesterfield) is supplied by Unknown in the Chesterfield Central zone and scores 9.5 out of 10, against an England and Wales average of 9.0. None of the 11 tested substances came close to a limit. The latest sample is from 7 March 2025.
- The cleanest tap water of the 3 areas tested in ChesterfieldS43 scores 9.5 out of 10, ahead of S40 in second place on 7.1.
- Scores higher than all 4 neighbouring districtsThe nearest rival is S21 on 9.2, against 9.5 here. Compare with S21
- Nothing tested came within 40% of its legal limitThe highest was Ammonia at 14% of the 0.5 mg/L maximum. See every reading
Questions about S43 water
Is S43 tap water safe to drink?
Based on the latest tests, S43 (Chesterfield) water scores 9.5/10, which is safe. 0 of 11 tested contaminants exceeded recommended levels. Water is supplied by Unknown.
What contaminants are in S43 water?
We tested 11 contaminants in S43 water. None exceeded recommended safe levels.
Who supplies water in S43?
S43 (Chesterfield) is supplied by Unknown. You can view their full profile and compliance data on our supplier page.
Is S43 water hard or soft?
No hardness reading has been published for S43 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 S43?
S43 water scored 9.5/10 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 S43 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for S43, 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 S43?
The Environment Agency rated the Doe Lea from Hawke Brooke to River Rother 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 fish. 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 S43, which is treated before it reaches homes.
Keep reading
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
- Best Water Filters UKEvery filter type compared on what it actually removes
- How to Test Your Tap WaterFrom DIY strips to professional lab analysis
- Best Water Filter Jug UKBRITA vs ZeroWater vs the rest, tested against real data
How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
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