Skip to main content
tapwater
England and Wales average 9.0

Tap water in NP25, MonmouthshireSafe to drink.

Supplied by Dŵr Cymru Welsh Water. 1,078 samples, 23 substances, latest on 17 December 2024. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.1 / 10

The tank is as full as the score.

What to do about it

ZeroWater 12-Cup Ready-Pour

ZeroWater 12-Cup Ready-Pour

£40typical price

Households concerned about PFAS and heavy metals

Check price at Amazon (opens in new tab)
Waterdrop 10UA Under Sink

Waterdrop 10UA Under Sink

£70typical price

High-volume under-sink filtration without RO complexity

Check price at Waterdrop (opens in new tab)
BRITA Marella XL + MAXTRA PRO

BRITA Marella XL + MAXTRA PRO

£25typical price

Basic chlorine and taste improvement on a budget

Check price at Amazon (opens in new tab)

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 NP25 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.

Nitrite came closest to a limit, at 64% of it. 18 of 20 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCadmium: 0.000025 mg/L, <1% of the 0.005 mg/L limitCadmium<1%Selenium: 0.00023 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Antimony: 0.000038 mg/L, <1% of the 0.005 mg/L limitAntimony<1%Arsenic: 0.00011 mg/L, 1% of the 0.01 mg/L limitArsenic1%Aluminium: 0.005 mg/L, 3% of the 0.2 mg/L limitAluminium3%Boron: 0.028 mg/L, 3% of the 1 mg/L limitBoron3%Manganese: 0.0015 mg/L, 3% of the 0.05 mg/L limitManganese3%Chromium: 0.0015 mg/L, 3% of the 0.05 mg/L limitChromium3%Mercury: 0.000042 mg/L, 4% of the 0.001 mg/L limitMercury4%Copper: 0.12 mg/L, 6% of the 2 mg/L limitCopper6%Turbidity: 0.27 NTU, 7% of the 4 NTU limitTurbidity7%Fluoride: 0.11 mg/L, 7% of the 1.5 mg/L limitFluoride7%Nickel: 0.0016 mg/L, 8% of the 0.02 mg/L limitNickel8%Bromate: 0.00086 mg/L, 9% of the 0.01 mg/L limitBromate9%Lead: 0.001 mg/L, 10% of the 0.01 mg/L limitLead10%Trihalomethanes: 0.01 mg/L, 10% of the 0.1 mg/L limitTrihalomethanes10%Iron: 0.035 mg/L, 18% of the 0.2 mg/L limitIron18%Colour: 4.6 mg/L Pt/Co, 23% of the 20 mg/L Pt/Co limitColour23%Nitrate: 15.8 mg/L, 32% of the 50 mg/L limitNitrate32%Nitrite: 0.32 mg/L, 64% of the 0.5 mg/L limitNitrite64%
  1. Nitrite64%
  2. Nitrate32%
  3. Colour23%
  4. Iron18%
  5. Lead10%
  6. Trihalomethanes10%
  7. Bromate9%
  8. Nickel8%
  9. Fluoride7%
  10. Turbidity7%
  11. Copper6%
  12. Mercury4%
  13. Manganese3%
  14. Chromium3%
  15. Boron3%
  16. Aluminium3%
  17. Arsenic1%
  18. Antimony<1%
  19. Selenium<1%
  20. Cadmium<1%
  • Coliform Bacteria none found
  • E. coli none found
  • Conductivity 360 µS/cm
All 23 results as a table
SubstanceResultLegal limitShare of limit
Iron0.035 mg/L0.2 mg/L
18%
Turbidity0.27 NTU4 NTU
7%
Colour4.6 mg/L Pt/Co20 mg/L Pt/Co
23%
Aluminium0.005 mg/L0.2 mg/L
3%
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Conductivity360 µS/cmNo legal limit–
Manganese0.0015 mg/L0.05 mg/L
3%
Trihalomethanes0.01 mg/L0.1 mg/L
10%
Bromate0.00086 mg/L0.01 mg/L
9%
Boron0.028 mg/L1 mg/L
3%
Copper0.12 mg/L2 mg/L
6%
Fluoride0.11 mg/L1.5 mg/L
7%
Nitrite0.32 mg/L0.5 mg/L
64%
Nitrate15.8 mg/L50 mg/L
32%
Selenium0.00023 mg/L0.04 mg/L
<1%
Mercury0.000042 mg/L0.001 mg/L
4%
Chromium0.0015 mg/L0.05 mg/L
3%
Lead0.001 mg/L0.01 mg/L
10%
Nickel0.0016 mg/L0.02 mg/L
8%
Antimony0.000038 mg/L0.005 mg/L
<1%
Arsenic0.00011 mg/L0.01 mg/L
1%
Cadmium0.000025 mg/L0.005 mg/L
<1%
Outside your tap

Your river is the Wye - conf Walford Bk to Bigsweir Br, rated moderate

The Environment Agency rated the Wye - conf Walford Bk to Bigsweir Br as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by temperature. 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

NP25 in short

Tap water in NP25 (Monmouthshire) is supplied by Dŵr Cymru Welsh Water in the Monmouthshire Central zone and scores 9.1 out of 10, against an England and Wales average of 9.0. None of the 23 tested substances came close to a limit. The latest sample is from 17 December 2024.

  • The lowest score of the 5 areas tested in MonmouthshireNP25 scores 9.1 out of 10. The best in Monmouthshire, NP7, scores 9.6.
  • Every one of the 4 neighbouring districts scores higherNP7 next door scores 9.6, against 9.1 here. Supply zones, not distance, explain the gap. See NP7
  • Nitrite is the reading closest to its limit, at 64% of the 0.5 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading

Next door

NP79.6 out of 10NP269.4 out of 10NP159.4 out of 10NP169.5 out of 10

Questions about NP25 water

Is NP25 tap water safe to drink?

Based on the latest tests, NP25 (Monmouthshire) water scores 9.1/10, which is safe. 0 of 23 tested contaminants exceeded recommended levels. Water is supplied by Dŵr Cymru Welsh Water.

What contaminants are in NP25 water?

We tested 23 contaminants in NP25 water. None exceeded recommended safe levels.

Who supplies water in NP25?

NP25 (Monmouthshire) is supplied by Dŵr Cymru Welsh Water. You can view their full profile and compliance data on our supplier page.

Should I use a water filter in NP25?

NP25 water scored 9.1/10 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 NP25 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for NP25, 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 NP25?

The Environment Agency rated the Wye - conf Walford Bk to Bigsweir Br as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by temperature. 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 NP25, which is treated before it reaches homes.

Keep reading

How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map

River and groundwater readings near NP25

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.

SubstanceReadingDrinking water limit
pH8.06 pHNone
Temperature14.9 °CNone
Conductivity652 µS/cmNone
Nitrate8.6 mg/L50 mg/L
Nitrite0.01 mg/L0.5 mg/L
Phosphate0.055 mg/LNone
Dissolved Oxygen9.72 mg/LNone
Manganese0.014 mg/L0.05 mg/L
Copper0.00033 mg/L2 mg/L
Zinc0.00053 mg/LNone
Aluminium0.047 mg/L0.2 mg/L
Iron0.11 mg/L0.2 mg/L
PFAS (total)0.0011 µg/LNone

Get alerts for your area

We'll email you when water quality data changes for NP25.

Source: Dŵr Cymru Welsh Water test results, published through the Stream Water Data Portal; rivers and PFAS from the Environment Agency. Page updated . How we score · Where the data comes from