Tap water in DN40, North East LincolnshireSafe to drink.Very hard.
Supplied by Anglian Water. 474 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 293 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 DN40.
Osmio PRO-III Ultimate Whole House
£499typical price
Removes nitrate, the result that stood out in DN40.
We earn a commission if you buy through these links, at no extra cost to you. It never changes which product we put first. How we make money
What's in a glass of DN40 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% |
293mg 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 DN40
Leave your details and we will email you when we can match you with installers who cover DN40. No obligation.
Request a free assessment and we'll come back to you with local installer options for your area.
100%
free, no obligation
shared only with your consent
Your river is the North Beck Drain, rated moderate
The Environment Agency rated the North Beck Drain 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. 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
DN40 in short
Tap water in DN40 (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
- 7th cleanest of 8 areas tested in North East Lincolnshire1 area in North East Lincolnshire scored lower. The best is DN33 on 9.4.
- Very hard water at 293 mg/LThe threshold for very hard is 250 mg/L. Expect visible limescale on taps and in kettles in DN40. How hardness is measured
Questions about DN40 water
Is DN40 tap water safe to drink?
Based on the latest tests, DN40 (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 DN40 water?
We tested 18 contaminants in DN40 water. 1 were flagged, including Nitrate.
Who supplies water in DN40?
DN40 (North East Lincolnshire) is supplied by Anglian Water. You can view their full profile and compliance data on our supplier page.
Is DN40 water hard or soft?
Water in DN40 (North East Lincolnshire) has a hardness of 293 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 DN40?
With 1 contaminant above recommended levels in DN40, 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 DN40 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for DN40, 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 DN40?
The Environment Agency rated the North Beck Drain 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. 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 DN40, 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
- 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
Nitrate levelsHow to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
River and groundwater readings near DN40
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 |
|---|---|---|
| Mercury | 0.000012 mg/L | 0.001 mg/L |
| pH | 7.92 pH | None |
| Hardness (as CaCO3) | 239 mg/L | None |
| Lead | 0 mg/L | 0.01 mg/L |
| Zinc | 0.0043 mg/L | None |
| Nickel | 0.0047 mg/L | 0.02 mg/L |
| Copper | 0.00001 mg/L | 2 mg/L |
| Arsenic | 0.0028 mg/L | 0.01 mg/L |
| Chromium | 0.0011 mg/L | 0.05 mg/L |
| Temperature | 10.2 °C | None |
| Conductivity | 961 µS/cm | None |
| Nitrate | 12.6 mg/L | 50 mg/L |
| Nitrite | 0.0098 mg/L | 0.5 mg/L |
| Dissolved Oxygen | 13.8 mg/L | None |
| Ammonia | 0.263 mg/L | 0.5 mg/L |
| Phosphate | 0.177 mg/L | None |
Get alerts for your area
We'll email you when water quality data changes for DN40.