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England and Wales average 9.0

Tap water in NP16, MonmouthshireSafe to drink.

Supplied by Dŵr Cymru Welsh Water. 850 samples, 23 substances, latest on 6 December 2024. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.5 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of NP16 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.

Trihalomethanes came closest to a limit, at 34% of it. 19 of 20 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitChromium: 0.000092 mg/L, <1% of the 0.05 mg/L limitChromium<1%Cadmium: 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: 0.000034 mg/L, <1% of the 0.005 mg/L limitAntimony<1%Manganese: 0.00068 mg/L, 1% of the 0.05 mg/L limitManganese1%Arsenic: 0.00014 mg/L, 1% of the 0.01 mg/L limitArsenic1%Lead: 0.00016 mg/L, 2% of the 0.01 mg/L limitLead2%Iron: 0.004 mg/L, 2% of the 0.2 mg/L limitIron2%Nitrite: 0.013 mg/L, 3% of the 0.5 mg/L limitNitrite3%Boron: 0.028 mg/L, 3% of the 1 mg/L limitBoron3%Copper: 0.058 mg/L, 3% of the 2 mg/L limitCopper3%Nickel: 0.00059 mg/L, 3% of the 0.02 mg/L limitNickel3%Aluminium: 0.0078 mg/L, 4% of the 0.2 mg/L limitAluminium4%Mercury: 0.000042 mg/L, 4% of the 0.001 mg/L limitMercury4%Bromate: 0.00056 mg/L, 6% of the 0.01 mg/L limitBromate6%Turbidity: 0.27 NTU, 7% of the 4 NTU limitTurbidity7%Fluoride: 0.11 mg/L, 7% of the 1.5 mg/L limitFluoride7%Nitrate: 10.4 mg/L, 21% of the 50 mg/L limitNitrate21%Colour: 4.6 mg/L Pt/Co, 23% of the 20 mg/L Pt/Co limitColour23%Trihalomethanes: 0.034 mg/L, 34% of the 0.1 mg/L limitTrihalomethanes34%
  1. Trihalomethanes34%
  2. Colour23%
  3. Nitrate21%
  4. Fluoride7%
  5. Turbidity7%
  6. Bromate6%
  7. Mercury4%
  8. Aluminium4%
  9. Nickel3%
  10. Copper3%
  11. Boron3%
  12. Nitrite3%
  13. Iron2%
  14. Lead2%
  15. Arsenic1%
  16. Manganese1%
  17. Antimony<1%
  18. Selenium<1%
  19. Cadmium<1%
  20. Chromium<1%
  • Conductivity 320 µS/cm
  • Coliform Bacteria none found
  • E. coli none found
All 23 results as a table
SubstanceResultLegal limitShare of limit
Bromate0.00056 mg/L0.01 mg/L
6%
Trihalomethanes0.034 mg/L0.1 mg/L
34%
Conductivity320 µS/cmNo legal limit–
Boron0.028 mg/L1 mg/L
3%
Coliform Bacteria0 count/100mlMust be zeroNone found
Selenium0.00023 mg/L0.04 mg/L
<1%
E. coli0 count/100mlMust be zeroNone found
Antimony0.000034 mg/L0.005 mg/L
<1%
Chromium0.000092 mg/L0.05 mg/L
<1%
Nickel0.00059 mg/L0.02 mg/L
3%
Mercury0.000042 mg/L0.001 mg/L
4%
Cadmium0.000025 mg/L0.005 mg/L
<1%
Arsenic0.00014 mg/L0.01 mg/L
1%
Lead0.00016 mg/L0.01 mg/L
2%
Fluoride0.11 mg/L1.5 mg/L
7%
Manganese0.00068 mg/L0.05 mg/L
1%
Copper0.058 mg/L2 mg/L
3%
Iron0.004 mg/L0.2 mg/L
2%
Aluminium0.0078 mg/L0.2 mg/L
4%
Nitrite0.013 mg/L0.5 mg/L
3%
Nitrate10.4 mg/L50 mg/L
21%
Turbidity0.27 NTU4 NTU
7%
Colour4.6 mg/L Pt/Co20 mg/L Pt/Co
23%
Outside your tap

Your estuary is the Severn Middle, rated moderate

The Environment Agency rated the Severn Middle as moderate for ecological health in its 2025 assessment, meaning the estuary is noticeably changed by pollution or engineering. It is held back by seagrass and saltmarsh. 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

NP16 in short

Tap water in NP16 (Monmouthshire) is supplied by Dŵr Cymru Welsh Water in the Monmouthshire Central zone and scores 9.5 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 6 December 2024.

  • 2nd cleanest of 5 areas tested in MonmouthshireOnly 1 area in Monmouthshire scored higher. The best is NP7 on 9.6.
  • Nothing tested came within 40% of its legal limitThe highest was Trihalomethanes at 34% of the 0.1 mg/L maximum. See every reading
  • Scores higher than 3 of 4 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

NP79.6 out of 10NP269.4 out of 10NP159.4 out of 10NP259.1 out of 10

Questions about NP16 water

Is NP16 tap water safe to drink?

Based on the latest tests, NP16 (Monmouthshire) water scores 9.5/10, which is safe. 0 of 23 tested contaminants exceeded recommended levels. Water is supplied by Dŵr Cymru Welsh Water.

What contaminants are in NP16 water?

We tested 23 contaminants in NP16 water. None exceeded recommended safe levels.

Who supplies water in NP16?

NP16 (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 NP16?

NP16 water scored 9.5/10 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 NP16 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for NP16, 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 estuary near NP16?

The Environment Agency rated the Severn Middle as moderate for ecological health in its 2025 assessment, meaning the estuary is noticeably changed by pollution or engineering. It is held back by seagrass and saltmarsh. 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 estuary, not of tap water in NP16, 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 NP16

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
pH7.87 pHNone
Temperature8.2 °CNone
Conductivity287 µS/cmNone
Ammonia0.021 mg/L0.5 mg/L
Nitrate3.9 mg/L50 mg/L
Nitrite0.0071 mg/L0.5 mg/L
Phosphate0.16 mg/LNone
Dissolved Oxygen11.7 mg/LNone
Chromium0.013 mg/L0.05 mg/L
Zinc0.00978 mg/LNone
Nickel0.0011 mg/L0.02 mg/L
Copper0.00223 mg/L2 mg/L

Get alerts for your area

We'll email you when water quality data changes for NP16.

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