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tapwater
England and Wales average 9.0

Tap water in CF10, CardiffSafe to drink.

Supplied by Dŵr Cymru Welsh Water. 569 samples, 23 substances, latest on 30 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.

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What's in a glass of CF10 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 46% 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: 0.000046 mg/L, <1% of the 0.005 mg/L limitAntimony<1%Manganese: 0.00068 mg/L, 1% of the 0.05 mg/L limitManganese1%Lead: 0.00016 mg/L, 2% of the 0.01 mg/L limitLead2%Arsenic: 0.0002 mg/L, 2% of the 0.01 mg/L limitArsenic2%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%Nickel: 0.00059 mg/L, 3% of the 0.02 mg/L limitNickel3%Iron: 0.0067 mg/L, 3% of the 0.2 mg/L limitIron3%Mercury: 0.000042 mg/L, 4% of the 0.001 mg/L limitMercury4%Copper: 0.099 mg/L, 5% of the 2 mg/L limitCopper5%Turbidity: 0.27 NTU, 7% of the 4 NTU limitTurbidity7%Fluoride: 0.11 mg/L, 7% of the 1.5 mg/L limitFluoride7%Nitrate: 4.28 mg/L, 9% of the 50 mg/L limitNitrate9%Bromate: 0.001 mg/L, 10% of the 0.01 mg/L limitBromate10%Nitrite: 0.09 mg/L, 18% of the 0.5 mg/L limitNitrite18%Colour: 4.6 mg/L Pt/Co, 23% of the 20 mg/L Pt/Co limitColour23%Trihalomethanes: 0.046 mg/L, 46% of the 0.1 mg/L limitTrihalomethanes46%
  1. Trihalomethanes46%
  2. Colour23%
  3. Nitrite18%
  4. Bromate10%
  5. Nitrate9%
  6. Fluoride7%
  7. Turbidity7%
  8. Copper5%
  9. Mercury4%
  10. Iron3%
  11. Nickel3%
  12. Boron3%
  13. Aluminium3%
  14. Arsenic2%
  15. Lead2%
  16. Manganese1%
  17. Antimony<1%
  18. Selenium<1%
  19. Cadmium<1%
  20. Chromium<1%
  • E. coli none found
  • Coliform Bacteria none found
  • Conductivity 240 µS/cm
All 23 results as a table
SubstanceResultLegal limitShare of limit
Iron0.0067 mg/L0.2 mg/L
3%
Manganese0.00068 mg/L0.05 mg/L
1%
Aluminium0.005 mg/L0.2 mg/L
3%
E. coli0 count/100mlMust be zeroNone found
Coliform Bacteria0 count/100mlMust be zeroNone found
Colour4.6 mg/L Pt/Co20 mg/L Pt/Co
23%
Turbidity0.27 NTU4 NTU
7%
Conductivity240 µS/cmNo legal limit–
Bromate0.001 mg/L0.01 mg/L
10%
Boron0.028 mg/L1 mg/L
3%
Trihalomethanes0.046 mg/L0.1 mg/L
46%
Nickel0.00059 mg/L0.02 mg/L
3%
Antimony0.000046 mg/L0.005 mg/L
<1%
Lead0.00016 mg/L0.01 mg/L
2%
Mercury0.000042 mg/L0.001 mg/L
4%
Cadmium0.000025 mg/L0.005 mg/L
<1%
Chromium0.000092 mg/L0.05 mg/L
<1%
Selenium0.00023 mg/L0.04 mg/L
<1%
Nitrite0.09 mg/L0.5 mg/L
18%
Fluoride0.11 mg/L1.5 mg/L
7%
Nitrate4.28 mg/L50 mg/L
9%
Copper0.099 mg/L2 mg/L
5%
Arsenic0.0002 mg/L0.01 mg/L
2%

CF10 in short

Tap water in CF10 (Cardiff) is supplied by Dŵr Cymru Welsh Water in the Cardiff Central zone and scores 9.4 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 30 December 2024.

  • Trihalomethanes is the reading closest to its limit, at 46% of the 0.1 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 2nd cleanest of 9 areas tested in CardiffOnly 1 area in Cardiff scored higher. The best is CF30 on 10. Every area in Cardiff
  • Scores higher than 1 of 8 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

CF239.4 out of 10CF249.3 out of 10CF119.4 out of 10CF59.4 out of 10CF149.4 out of 10CF3010.0 out of 10CF159.4 out of 10CF39.4 out of 10

Questions about CF10 water

Is CF10 tap water safe to drink?

Based on the latest tests, CF10 (Cardiff) water scores 9.4/10, which is safe. 0 of 23 tested contaminants exceeded recommended levels. Water is supplied by Dŵr Cymru Welsh Water.

What contaminants are in CF10 water?

We tested 23 contaminants in CF10 water. None exceeded recommended safe levels.

Who supplies water in CF10?

CF10 (Cardiff) 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 CF10?

CF10 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 CF10 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for CF10, 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

How to test your waterBest water filtersFilter shower headsWater testing kitsAll of CardiffUK water rankingsWater hardness checkerWater hardness map

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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