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tapwater
England and Wales average 9.0

Tap water in CF11, CardiffSafe to drink.

Supplied by Dŵr Cymru Welsh Water. 1,280 samples, 23 substances, latest on 18 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 CF11 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 33% 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: 0.000043 mg/L, <1% of the 0.005 mg/L limitAntimony<1%Arsenic: 0.00013 mg/L, 1% of the 0.01 mg/L limitArsenic1%Manganese: 0.0012 mg/L, 2% of the 0.05 mg/L limitManganese2%Aluminium: 0.005 mg/L, 3% of the 0.2 mg/L limitAluminium3%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%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%Turbidity: 0.27 NTU, 7% of the 4 NTU limitTurbidity7%Fluoride: 0.11 mg/L, 7% of the 1.5 mg/L limitFluoride7%Lead: 0.0011 mg/L, 11% of the 0.01 mg/L limitLead11%Nitrate: 5.71 mg/L, 11% of the 50 mg/L limitNitrate11%Bromate: 0.0013 mg/L, 13% of the 0.01 mg/L limitBromate13%Colour: 4.6 mg/L Pt/Co, 23% of the 20 mg/L Pt/Co limitColour23%Iron: 0.053 mg/L, 26% of the 0.2 mg/L limitIron26%Trihalomethanes: 0.033 mg/L, 33% of the 0.1 mg/L limitTrihalomethanes33%
  1. Trihalomethanes33%
  2. Iron26%
  3. Colour23%
  4. Bromate13%
  5. Nitrate11%
  6. Lead11%
  7. Fluoride7%
  8. Turbidity7%
  9. Mercury4%
  10. Chromium3%
  11. Nickel3%
  12. Copper3%
  13. Boron3%
  14. Nitrite3%
  15. Aluminium3%
  16. Manganese2%
  17. Arsenic1%
  18. Antimony<1%
  19. Selenium<1%
  20. Cadmium<1%
  • E. coli none found
  • Coliform Bacteria none found
  • Conductivity 170 µS/cm
All 23 results as a table
SubstanceResultLegal limitShare of limit
E. coli0 count/100mlMust be zeroNone found
Coliform Bacteria0 count/100mlMust be zeroNone found
Bromate0.0013 mg/L0.01 mg/L
13%
Trihalomethanes0.033 mg/L0.1 mg/L
33%
Conductivity170 µS/cmNo legal limit–
Boron0.028 mg/L1 mg/L
3%
Antimony0.000043 mg/L0.005 mg/L
<1%
Lead0.0011 mg/L0.01 mg/L
11%
Selenium0.00023 mg/L0.04 mg/L
<1%
Chromium0.0015 mg/L0.05 mg/L
3%
Arsenic0.00013 mg/L0.01 mg/L
1%
Mercury0.000042 mg/L0.001 mg/L
4%
Fluoride0.11 mg/L1.5 mg/L
7%
Nickel0.00059 mg/L0.02 mg/L
3%
Cadmium0.000025 mg/L0.005 mg/L
<1%
Iron0.053 mg/L0.2 mg/L
26%
Aluminium0.005 mg/L0.2 mg/L
3%
Copper0.058 mg/L2 mg/L
3%
Nitrite0.013 mg/L0.5 mg/L
3%
Manganese0.0012 mg/L0.05 mg/L
2%
Nitrate5.71 mg/L50 mg/L
11%
Turbidity0.27 NTU4 NTU
7%
Colour4.6 mg/L Pt/Co20 mg/L Pt/Co
23%

CF11 in short

Tap water in CF11 (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 18 December 2024.

  • 3rd cleanest of 9 areas tested in CardiffOnly 2 areas in Cardiff scored higher. The best is CF30 on 10. Every area in Cardiff
  • Nothing tested came within 40% of its legal limitThe highest was Trihalomethanes at 33% of the 0.1 mg/L maximum. See every reading
  • 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

CF109.4 out of 10CF239.4 out of 10CF249.3 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 CF11 water

Is CF11 tap water safe to drink?

Based on the latest tests, CF11 (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 CF11 water?

We tested 23 contaminants in CF11 water. None exceeded recommended safe levels.

Who supplies water in CF11?

CF11 (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 CF11?

CF11 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 CF11 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for CF11, 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