Tap water in DN37, North East LincolnshireSafe to drink.Very hard.
Supplied by Anglian Water. 954 samples, 18 substances, latest on 20 December 2024. Everything is inside the legal limit. One result, nitrate, sits close to the line.
9.0 / 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 301 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.
Waterdrop G3P600 Reverse Osmosis
£550typical price
Removes nitrate, the result that stood out in DN37.
Osmio PRO-III Ultimate Whole House
£499typical price
Removes nitrate, the result that stood out in DN37.
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What's in a glass of DN37 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 77% of it. 14 of 16 substances used under a quarter of theirs.
- Nitrate77%
- Fluoride57%
- Iron11%
- Nickel8%
- Trihalomethanes7%
- Nitrite6%
- Aluminium6%
- Manganese6%
- Turbidity5%
- Copper3%
- Arsenic3%
- Selenium2%
- Antimony2%
- Lead2%
- Chromium2%
- Cadmium<1%
- Coliform Bacteria none found
- E. coli none found
All 18 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Nitrate | 38.4 mg/L | 50 mg/L | 77% |
| Trihalomethanes | 0.0066 mg/L | 0.1 mg/L | 7% |
| Antimony | 0.00008 mg/L | 0.005 mg/L | 2% |
| Selenium | 0.00072 mg/L | 0.04 mg/L | 2% |
| Coliform Bacteria | 0 count/100ml | Must be zero | None found |
| E. coli | 0 count/100ml | Must be zero | None found |
| Turbidity | 0.21 NTU | 4 NTU | 5% |
| Nitrite | 0.03 mg/L | 0.5 mg/L | 6% |
| Aluminium | 0.012 mg/L | 0.2 mg/L | 6% |
| Iron | 0.021 mg/L | 0.2 mg/L | 11% |
| Manganese | 0.003 mg/L | 0.05 mg/L | 6% |
| Copper | 0.05 mg/L | 2 mg/L | 3% |
| Fluoride | 0.85 mg/L | 1.5 mg/L | 57% |
| Arsenic | 0.00025 mg/L | 0.01 mg/L | 3% |
| Cadmium | 0.00002 mg/L | 0.005 mg/L | <1% |
| Chromium | 0.00076 mg/L | 0.05 mg/L | 2% |
| Nickel | 0.00151 mg/L | 0.02 mg/L | 8% |
| Lead | 0.00016 mg/L | 0.01 mg/L | 2% |
301mg 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.
Softener quotes for DN37
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Your river is the Laceby Beck / River Freshney Catchment (to N Sea), rated poor
The Environment Agency rated the Laceby Beck / River Freshney Catchment (to N Sea) 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 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
DN37 in short
Tap water in DN37 (North East Lincolnshire) is supplied by Anglian Water in the North East Lincolnshire Central zone and scores 9.0 out of 10, against an England and Wales average of 9.0. 1 of 18 tested substances was close to or over a limit. The latest sample is from 20 December 2024.
- Nitrate is within its legal limit but flagged, at 77% of the 50 mg/L maximumAnything over three quarters of a limit is flagged here as worth watching. It has not gone over. See every reading
- Among the hardest water in the country at 301 mg/LVery hard starts at 250 mg/L. At this level kettles scale up within weeks and a softener is a normal purchase in DN37. How hardness is measured
- 6th cleanest of 8 areas tested in North East Lincolnshire2 areas in North East Lincolnshire scored lower. The best is DN33 on 9.4.
Questions about DN37 water
Is DN37 tap water safe to drink?
Based on the latest tests, DN37 (North East Lincolnshire) water scores 9/10, which is safe. 1 of 18 tested contaminants exceeded recommended levels. Water is supplied by Anglian Water.
What contaminants are in DN37 water?
We tested 18 contaminants in DN37 water. 1 were flagged, including Nitrate.
Who supplies water in DN37?
DN37 (North East Lincolnshire) is supplied by Anglian Water. You can view their full profile and compliance data on our supplier page.
Is DN37 water hard or soft?
Water in DN37 (North East Lincolnshire) has a hardness of 301 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 DN37?
With 1 contaminant above recommended levels in DN37, a water filter could help. A filter jug or under-sink filter can reduce most common contaminants. See our filter recommendations for your area.
Are there PFAS forever chemicals in DN37 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for DN37, 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 DN37?
The Environment Agency rated the Laceby Beck / River Freshney Catchment (to N Sea) 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 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 DN37, 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?
- Best Water Filters UKEvery filter type compared on what it actually removes
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- Best water softener UKHarvey, Kinetico, BWT, Monarch and Water2Buy compared
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- 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
Nitrate levelsHow to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
River and groundwater readings near DN37
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.
Get alerts for your area
We'll email you when water quality data changes for DN37.