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tapwater
England and Wales average 9.0

Tap water in CF23, CardiffSafe to drink.

Supplied by Dŵr Cymru Welsh Water. 1,651 samples, 23 substances, latest on 19 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 CF23 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 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: 0.000042 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%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%Chromium: 0.0015 mg/L, 3% of the 0.05 mg/L limitChromium3%Iron: 0.0075 mg/L, 4% of the 0.2 mg/L limitIron4%Copper: 0.08 mg/L, 4% of the 2 mg/L limitCopper4%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%Nitrate: 5.75 mg/L, 12% of the 50 mg/L limitNitrate12%Bromate: 0.0012 mg/L, 12% of the 0.01 mg/L limitBromate12%Colour: 4.6 mg/L Pt/Co, 23% of the 20 mg/L Pt/Co limitColour23%Nitrite: 0.12 mg/L, 24% of the 0.5 mg/L limitNitrite24%Trihalomethanes: 0.034 mg/L, 34% of the 0.1 mg/L limitTrihalomethanes34%
  1. Trihalomethanes34%
  2. Nitrite24%
  3. Colour23%
  4. Bromate12%
  5. Nitrate12%
  6. Fluoride7%
  7. Turbidity7%
  8. Mercury4%
  9. Copper4%
  10. Iron4%
  11. Chromium3%
  12. Nickel3%
  13. Boron3%
  14. Aluminium3%
  15. Lead2%
  16. Arsenic1%
  17. Manganese1%
  18. Antimony<1%
  19. Selenium<1%
  20. Cadmium<1%
  • E. coli none found
  • Coliform Bacteria none found
  • Conductivity 260 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
Conductivity260 µS/cmNo legal limit–
Manganese0.00068 mg/L0.05 mg/L
1%
Iron0.0075 mg/L0.2 mg/L
4%
Aluminium0.005 mg/L0.2 mg/L
3%
Colour4.6 mg/L Pt/Co20 mg/L Pt/Co
23%
Turbidity0.27 NTU4 NTU
7%
Nickel0.00059 mg/L0.02 mg/L
3%
Antimony0.000042 mg/L0.005 mg/L
<1%
Chromium0.0015 mg/L0.05 mg/L
3%
Selenium0.00023 mg/L0.04 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%
Fluoride0.11 mg/L1.5 mg/L
7%
Arsenic0.00014 mg/L0.01 mg/L
1%
Copper0.08 mg/L2 mg/L
4%
Nitrite0.12 mg/L0.5 mg/L
24%
Nitrate5.75 mg/L50 mg/L
12%
Bromate0.0012 mg/L0.01 mg/L
12%
Boron0.028 mg/L1 mg/L
3%
Trihalomethanes0.034 mg/L0.1 mg/L
34%

CF23 in short

Tap water in CF23 (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 19 December 2024.

  • 6th cleanest of 9 areas tested in CardiffSquarely mid-table for Cardiff, between CF30 on 10 and CF24 on 9.3. Every area in Cardiff
  • 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 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 10CF119.4 out of 10CF249.3 out of 10CF149.4 out of 10CF59.4 out of 10CF3010.0 out of 10CF159.4 out of 10CF39.4 out of 10

Questions about CF23 water

Is CF23 tap water safe to drink?

Based on the latest tests, CF23 (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 CF23 water?

We tested 23 contaminants in CF23 water. None exceeded recommended safe levels.

Who supplies water in CF23?

CF23 (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 CF23?

CF23 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 CF23 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for CF23, 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