Tap water in NN15, North NorthamptonshireSafe to drink.Very hard.
Supplied by Anglian Water. 1,349 samples, 19 substances, latest on 23 December 2024. 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 225 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
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 NN15 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 33% of it. 15 of 16 substances used under a quarter of theirs.
- Nitrate33%
- Trihalomethanes22%
- Fluoride19%
- Iron15%
- Nickel11%
- Lead9%
- Nitrite6%
- Aluminium6%
- Manganese6%
- Turbidity5%
- Antimony5%
- Arsenic3%
- Copper2%
- Selenium2%
- Chromium2%
- Cadmium<1%
- Coliform Bacteria none found
- E. coli none found
- Conductivity 551 µS/cm
All 19 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Nitrate | 16.4 mg/L | 50 mg/L | 33% |
| Nitrite | 0.03 mg/L | 0.5 mg/L | 6% |
| 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% |
| Aluminium | 0.012 mg/L | 0.2 mg/L | 6% |
| Iron | 0.03 mg/L | 0.2 mg/L | 15% |
| Manganese | 0.003 mg/L | 0.05 mg/L | 6% |
| Conductivity | 551 µS/cm | No legal limit | – |
| Copper | 0.04 mg/L | 2 mg/L | 2% |
| Fluoride | 0.28 mg/L | 1.5 mg/L | 19% |
| Arsenic | 0.00027 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 | 0.00219 mg/L | 0.02 mg/L | 11% |
| Lead | 0.00094 mg/L | 0.01 mg/L | 9% |
| Antimony | 0.00026 mg/L | 0.005 mg/L | 5% |
| Selenium | 0.00072 mg/L | 0.04 mg/L | 2% |
| Trihalomethanes | 0.0224 mg/L | 0.1 mg/L | 22% |
225mg 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 NN15
Leave your details and we will email you when we can match you with installers who cover NN15. 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 Ise - Upper, rated moderate
The Environment Agency rated the Ise - Upper as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by dissolved oxygen. 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 dropped since the previous assessment.
None of this is a test of your tap water. Environment Agency record · River health across England
NN15 in short
Tap water in NN15 (North Northamptonshire) is supplied by Anglian Water in the North Northamptonshire Central zone and scores 9.2 out of 10, against an England and Wales average of 9.0. None of the 19 tested substances came close to a limit. The latest sample is from 23 December 2024.
- Hard water at 225 mg/LHard starts at 180 mg/L, the point where a softener begins to pay for itself. Limescale will build up in NN15. How hardness is measured
- 5th cleanest of 10 areas tested in North NorthamptonshireSquarely mid-table for North Northamptonshire, between NN14 on 9.3 and NN8 on 8.9.
- Nothing tested came within 40% of its legal limitThe highest was Nitrate at 33% of the 50 mg/L maximum. See every reading
Questions about NN15 water
Is NN15 tap water safe to drink?
Based on the latest tests, NN15 (North Northamptonshire) water scores 9.2/10, which is safe. 0 of 19 tested contaminants exceeded recommended levels. Water is supplied by Anglian Water.
What contaminants are in NN15 water?
We tested 19 contaminants in NN15 water. None exceeded recommended safe levels.
Who supplies water in NN15?
NN15 (North Northamptonshire) is supplied by Anglian Water. You can view their full profile and compliance data on our supplier page.
Is NN15 water hard or soft?
Water in NN15 (North Northamptonshire) has a hardness of 225 mg/L CaCO3, which is classified as hard. Hard water can cause limescale buildup. A water softener or filter jug may help.
Should I use a water filter in NN15?
NN15 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 NN15 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for NN15, 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 NN15?
The Environment Agency rated the Ise - Upper as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by dissolved oxygen. 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 dropped since the previous assessment. This is a rating of the river, not of tap water in NN15, 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 NN15
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 NN15.