Tap water in DN7, DoncasterSafe to drink.Very hard.
Supplied by Yorkshire Water. 981 samples, 25 substances, latest on 23 September 2026. Everything is inside the legal limit, and nothing comes close to it.
9.2 / 10
The tank is as full as the score. The specks are the minerals that make water hard.
What to do about it
Hard water: compare softener quotes
At 262 mg/L a softener is the only thing that stops limescale. Filters do not soften water.
It pays for itself in most homes at this hardness, through a boiler that stays efficient and appliances that last.
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
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What's in a glass of DN7 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.
Nitrate came closest to a limit, at 59% of it. 19 of 20 substances used under a quarter of theirs.
- Nitrate59%
- Bromate19%
- Arsenic16%
- Colour15%
- Aluminium6%
- Fluoride5%
- Iron5%
- Mercury4%
- Trihalomethanes4%
- Manganese4%
- Turbidity3%
- Boron2%
- Nitrite2%
- Antimony1%
- Selenium1%
- Nickel<1%
- Lead<1%
- Cadmium<1%
- Copper<1%
- Chromium<1%
- Phosphate 1.03 mg/L
- Coliform Bacteria none found
- E. coli none found
- Conductivity 513 µS/cm
All 25 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Phosphate | 1.03 mg/L | No legal limit | – |
| Coliform Bacteria | 0 count/100ml | Must be zero | None found |
| Nitrite | 0.008 mg/L | 0.5 mg/L | 2% |
| Nitrate | 29.7 mg/L | 50 mg/L | 59% |
| E. coli | 0 count/100ml | Must be zero | None found |
| Aluminium | 0.0113 mg/L | 0.2 mg/L | 6% |
| Iron | 0.00928 mg/L | 0.2 mg/L | 5% |
| Manganese | 0.00178 mg/L | 0.05 mg/L | 4% |
| Turbidity | 0.11 NTU | 4 NTU | 3% |
| Colour | 3 mg/L Pt/Co | 20 mg/L Pt/Co | 15% |
| Conductivity | 513 µS/cm | No legal limit | – |
| Hardness (as CaCO3) | 252 mg/L | No legal limit | – |
| Chromium | 0.00019 mg/L | 0.05 mg/L | <1% |
| Cadmium | 0.000031 mg/L | 0.005 mg/L | <1% |
| Boron | 0.0243 mg/L | 1 mg/L | 2% |
| Antimony | 0.000065 mg/L | 0.005 mg/L | 1% |
| Selenium | 0.00043 mg/L | 0.04 mg/L | 1% |
| Arsenic | 0.00159 mg/L | 0.01 mg/L | 16% |
| Nickel | 0.00018 mg/L | 0.02 mg/L | <1% |
| Trihalomethanes | 0.00368 mg/L | 0.1 mg/L | 4% |
| Lead | 0.00009 mg/L | 0.01 mg/L | <1% |
| Mercury | 0.00004 mg/L | 0.001 mg/L | 4% |
| Bromate | 0.0019 mg/L | 0.01 mg/L | 19% |
| Fluoride | 0.08 mg/L | 1.5 mg/L | 5% |
| Copper | 0.0113 mg/L | 2 mg/L | <1% |
262mg 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 Hatfield Waste Drain Catchment (trib of Torne/Three Rivers), rated moderate
The Environment Agency rated the Hatfield Waste Drain Catchment (trib of Torne/Three Rivers) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by fish, dissolved oxygen and phosphate. 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. Its ecological rating has improved since the previous assessment.
None of this is a test of your tap water. Environment Agency record · River health across England
DN7 in short
Tap water in DN7 (Doncaster) is supplied by Yorkshire Water in the Doncaster Central zone and scores 9.2 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 23 September 2026.
- Nitrate is the reading closest to its limit, at 59% of the 50 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
- Very hard water at 262 mg/LThe threshold for very hard is 250 mg/L. Expect visible limescale on taps and in kettles in DN7. How hardness is measured
- 6th cleanest of 10 areas tested in DoncasterSquarely mid-table for Doncaster, between DN6 on 9.3 and DN8 on 8.8.
Questions about DN7 water
Is DN7 tap water safe to drink?
Based on the latest tests, DN7 (Doncaster) water scores 9.2/10, which is safe. 0 of 25 tested contaminants exceeded recommended levels. Water is supplied by Yorkshire Water.
What contaminants are in DN7 water?
We tested 25 contaminants in DN7 water. None exceeded recommended safe levels.
Who supplies water in DN7?
DN7 (Doncaster) is supplied by Yorkshire Water. You can view their full profile and compliance data on our supplier page.
Is DN7 water hard or soft?
Water in DN7 (Doncaster) has a hardness of 262 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 DN7?
DN7 water scored 9.2/10 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 DN7 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for DN7, 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 DN7?
The Environment Agency rated the Hatfield Waste Drain Catchment (trib of Torne/Three Rivers) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by fish, dissolved oxygen and phosphate. 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. Its ecological rating has improved since the previous assessment. This is a rating of the river, not of tap water in DN7, which is treated before it reaches homes.
Keep reading
- 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?
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
- 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
How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
River and groundwater readings near DN7
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 |
|---|---|---|
| Manganese | 0.282 mg/L | 0.05 mg/L |
| Iron | 0.729 mg/L | 0.2 mg/L |
| pH | 7.76 pH | None |
| Temperature | 13.5 °C | None |
| Conductivity | 947 µS/cm | None |
| Ammonia | 0.055 mg/L | 0.5 mg/L |
| Nitrate | 3.4 mg/L | 50 mg/L |
| Nitrite | 0.038 mg/L | 0.5 mg/L |
| Phosphate | 0.011 mg/L | None |
| Dissolved Oxygen | 9.19 mg/L | None |
| Hardness (as CaCO3) | 2440 mg/L | None |
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