Skip to main content
tapwater
England and Wales average 9.0

Tap water in CF5, CardiffSafe to drink.

Supplied by Dŵr Cymru Welsh Water. 1,245 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.

What to do about it

ZeroWater 12-Cup Ready-Pour

ZeroWater 12-Cup Ready-Pour

£40typical price

Households concerned about PFAS and heavy metals

Check price at Amazon (opens in new tab)
Waterdrop 10UA Under Sink

Waterdrop 10UA Under Sink

£70typical price

High-volume under-sink filtration without RO complexity

Check price at Waterdrop (opens in new tab)
BRITA Marella XL + MAXTRA PRO

BRITA Marella XL + MAXTRA PRO

£25typical price

Basic chlorine and taste improvement on a budget

Check price at Amazon (opens in new tab)

We earn a commission if you buy through these links, at no extra cost to you. It never changes which product we put first. How we make money

What's in a glass of CF5 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 41% of it. 18 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: 0.000045 mg/L, <1% of the 0.005 mg/L limitAntimony<1%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%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%Mercury: 0.000042 mg/L, 4% of the 0.001 mg/L limitMercury4%Turbidity: 0.27 NTU, 7% of the 4 NTU limitTurbidity7%Nitrate: 3.57 mg/L, 7% of the 50 mg/L limitNitrate7%Fluoride: 0.11 mg/L, 7% of the 1.5 mg/L limitFluoride7%Bromate: 0.001 mg/L, 10% of the 0.01 mg/L limitBromate10%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: 0.041 mg/L, 41% of the 0.1 mg/L limitTrihalomethanes41%
  1. Trihalomethanes41%
  2. Iron26%
  3. Colour23%
  4. Bromate10%
  5. Fluoride7%
  6. Nitrate7%
  7. Turbidity7%
  8. Mercury4%
  9. Nickel3%
  10. Copper3%
  11. Boron3%
  12. Nitrite3%
  13. Aluminium3%
  14. Manganese2%
  15. Lead2%
  16. Arsenic1%
  17. Antimony<1%
  18. Selenium<1%
  19. Cadmium<1%
  20. Chromium<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
Conductivity170 µS/cmNo legal limit–
Manganese0.0012 mg/L0.05 mg/L
2%
Iron0.053 mg/L0.2 mg/L
26%
Aluminium0.005 mg/L0.2 mg/L
3%
Turbidity0.27 NTU4 NTU
7%
Colour4.6 mg/L Pt/Co20 mg/L Pt/Co
23%
Bromate0.001 mg/L0.01 mg/L
10%
Trihalomethanes0.041 mg/L0.1 mg/L
41%
Boron0.028 mg/L1 mg/L
3%
Antimony0.000045 mg/L0.005 mg/L
<1%
Selenium0.00023 mg/L0.04 mg/L
<1%
Lead0.00016 mg/L0.01 mg/L
2%
Nickel0.00059 mg/L0.02 mg/L
3%
Mercury0.000042 mg/L0.001 mg/L
4%
Chromium0.000092 mg/L0.05 mg/L
<1%
Arsenic0.00014 mg/L0.01 mg/L
1%
Fluoride0.11 mg/L1.5 mg/L
7%
Cadmium0.000025 mg/L0.005 mg/L
<1%
Copper0.058 mg/L2 mg/L
3%
Nitrite0.013 mg/L0.5 mg/L
3%
Nitrate3.57 mg/L50 mg/L
7%

CF5 in short

Tap water in CF5 (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.

  • 8th cleanest of 9 areas tested in Cardiff1 area in Cardiff scored lower. The best is CF30 on 10. Every area in Cardiff
  • Trihalomethanes is the reading closest to its limit, at 41% of the 0.1 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. 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 10CF119.4 out of 10CF149.4 out of 10CF3010.0 out of 10CF159.4 out of 10CF39.4 out of 10

Questions about CF5 water

Is CF5 tap water safe to drink?

Based on the latest tests, CF5 (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 CF5 water?

We tested 23 contaminants in CF5 water. None exceeded recommended safe levels.

Who supplies water in CF5?

CF5 (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 CF5?

CF5 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 CF5 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for CF5, 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

Get alerts for your area

We'll email you when water quality data changes for CF5.

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