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tapwater
England and Wales average 9.0

Tap water in LL21, DenbighshireSafe to drink.

Supplied by Dŵr Cymru Welsh Water. 155 samples, 22 substances, latest on 16 December 2024. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.4 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of LL21 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 45% of it. 17 of 19 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitChromium: 0.00013 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%Antimony: 0.000028 mg/L, <1% of the 0.005 mg/L limitAntimony<1%Selenium: 0.00023 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Arsenic: 0.00011 mg/L, 1% of the 0.01 mg/L limitArsenic1%Lead: 0.00016 mg/L, 2% of the 0.01 mg/L limitLead2%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%Mercury: 0.000042 mg/L, 4% of the 0.001 mg/L limitMercury4%Nitrate: 2.61 mg/L, 5% of the 50 mg/L limitNitrate5%Manganese: 0.0028 mg/L, 6% of the 0.05 mg/L limitManganese6%Turbidity: 0.27 NTU, 7% of the 4 NTU limitTurbidity7%Fluoride: 0.11 mg/L, 7% of the 1.5 mg/L limitFluoride7%Nitrite: 0.056 mg/L, 11% of the 0.5 mg/L limitNitrite11%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%Aluminium: 0.065 mg/L, 33% of the 0.2 mg/L limitAluminium33%Trihalomethanes: 0.045 mg/L, 45% of the 0.1 mg/L limitTrihalomethanes45%
  1. Trihalomethanes45%
  2. Aluminium33%
  3. Colour23%
  4. Iron18%
  5. Nitrite11%
  6. Fluoride7%
  7. Turbidity7%
  8. Manganese6%
  9. Nitrate5%
  10. Mercury4%
  11. Nickel3%
  12. Copper3%
  13. Boron3%
  14. Lead2%
  15. Arsenic1%
  16. Selenium<1%
  17. Antimony<1%
  18. Cadmium<1%
  19. Chromium<1%
  • Coliform Bacteria none found
  • E. coli none found
  • Conductivity 150 µS/cm
All 22 results as a table
SubstanceResultLegal limitShare of limit
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Conductivity150 µS/cmNo legal limit–
Aluminium0.065 mg/L0.2 mg/L
33%
Manganese0.0028 mg/L0.05 mg/L
6%
Iron0.035 mg/L0.2 mg/L
18%
Colour4.6 mg/L Pt/Co20 mg/L Pt/Co
23%
Turbidity0.27 NTU4 NTU
7%
Mercury0.000042 mg/L0.001 mg/L
4%
Boron0.028 mg/L1 mg/L
3%
Trihalomethanes0.045 mg/L0.1 mg/L
45%
Lead0.00016 mg/L0.01 mg/L
2%
Copper0.058 mg/L2 mg/L
3%
Arsenic0.00011 mg/L0.01 mg/L
1%
Selenium0.00023 mg/L0.04 mg/L
<1%
Fluoride0.11 mg/L1.5 mg/L
7%
Cadmium0.000025 mg/L0.005 mg/L
<1%
Chromium0.00013 mg/L0.05 mg/L
<1%
Antimony0.000028 mg/L0.005 mg/L
<1%
Nickel0.00059 mg/L0.02 mg/L
3%
Nitrite0.056 mg/L0.5 mg/L
11%
Nitrate2.61 mg/L50 mg/L
5%

LL21 in short

Tap water in LL21 (Denbighshire) is supplied by Dŵr Cymru Welsh Water in the Denbighshire Central zone and scores 9.4 out of 10, against an England and Wales average of 9.0. None of the 22 tested substances came close to a limit. The latest sample is from 16 December 2024.

  • Trihalomethanes is the reading closest to its limit, at 45% of the 0.1 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 4th cleanest of 7 areas tested in DenbighshireSquarely mid-table for Denbighshire, between LL19 on 9.5 and LL18 on 9.
  • Scores higher than 3 of 6 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

LL189.0 out of 10LL199.5 out of 10LL159.3 out of 10LL169.1 out of 10LL179.4 out of 10LL209.5 out of 10

Questions about LL21 water

Is LL21 tap water safe to drink?

Based on the latest tests, LL21 (Denbighshire) water scores 9.4/10, which is safe. 0 of 22 tested contaminants exceeded recommended levels. Water is supplied by Dŵr Cymru Welsh Water.

What contaminants are in LL21 water?

We tested 22 contaminants in LL21 water. None exceeded recommended safe levels.

Who supplies water in LL21?

LL21 (Denbighshire) 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 LL21?

LL21 water scored 9.4/10 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 LL21 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for LL21, 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.

Keep reading

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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