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tapwater
England and Wales average 9.0

Tap water in CT15, DoverSafe to drink.

Supplied by Southern Water. 8,990 samples, 25 substances, latest on 30 April 2026. 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 CT15 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.

Nitrate came closest to a limit, at 51% of it. 20 of 21 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitLead: 0.00009 mg/L, <1% of the 0.01 mg/L limitLead<1%Selenium: 0.0005 mg/L, 1% of the 0.04 mg/L limitSelenium1%Bromate: 0.00013 mg/L, 1% of the 0.01 mg/L limitBromate1%Copper: 0.031 mg/L, 2% of the 2 mg/L limitCopper2%Nitrite: 0.009 mg/L, 2% of the 0.5 mg/L limitNitrite2%Chromium: 0.001 mg/L, 2% of the 0.05 mg/L limitChromium2%Cadmium: 0.00012 mg/L, 2% of the 0.005 mg/L limitCadmium2%Boron: 0.0255 mg/L, 3% of the 1 mg/L limitBoron3%Turbidity: 0.13 NTU, 3% of the 4 NTU limitTurbidity3%Manganese: 0.00178 mg/L, 4% of the 0.05 mg/L limitManganese4%Mercury: 0.00004 mg/L, 4% of the 0.001 mg/L limitMercury4%Nickel: 0.0009 mg/L, 5% of the 0.02 mg/L limitNickel5%Iron: 0.00928 mg/L, 5% of the 0.2 mg/L limitIron5%Fluoride: 0.08 mg/L, 5% of the 1.5 mg/L limitFluoride5%Aluminium: 0.0113 mg/L, 6% of the 0.2 mg/L limitAluminium6%Antimony: 0.0003 mg/L, 6% of the 0.005 mg/L limitAntimony6%Ammonia: 0.039 mg/L, 8% of the 0.5 mg/L limitAmmonia8%Trihalomethanes: 0.00791 mg/L, 8% of the 0.1 mg/L limitTrihalomethanes8%Arsenic: 0.001 mg/L, 10% of the 0.01 mg/L limitArsenic10%Colour: 3 mg/L Pt/Co, 15% of the 20 mg/L Pt/Co limitColour15%Nitrate: 25.7 mg/L, 51% of the 50 mg/L limitNitrate51%
  1. Nitrate51%
  2. Colour15%
  3. Arsenic10%
  4. Trihalomethanes8%
  5. Ammonia8%
  6. Antimony6%
  7. Aluminium6%
  8. Fluoride5%
  9. Iron5%
  10. Nickel5%
  11. Mercury4%
  12. Manganese4%
  13. Turbidity3%
  14. Boron3%
  15. Cadmium2%
  16. Chromium2%
  17. Nitrite2%
  18. Copper2%
  19. Bromate1%
  20. Selenium1%
  21. Lead<1%
  • pH 7.8 pH
  • Conductivity 630 µS/cm
  • Coliform Bacteria none found
  • E. coli none found
All 25 results as a table
SubstanceResultLegal limitShare of limit
pH7.8 pHNo legal limit–
Nitrate25.7 mg/L50 mg/L
51%
Lead0.00009 mg/L0.01 mg/L
<1%
Conductivity630 µS/cmNo legal limit–
Colour3 mg/L Pt/Co20 mg/L Pt/Co
15%
Turbidity0.13 NTU4 NTU
3%
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Aluminium0.0113 mg/L0.2 mg/L
6%
Iron0.00928 mg/L0.2 mg/L
5%
Manganese0.00178 mg/L0.05 mg/L
4%
Boron0.0255 mg/L1 mg/L
3%
Trihalomethanes0.00791 mg/L0.1 mg/L
8%
Bromate0.00013 mg/L0.01 mg/L
1%
Nitrite0.009 mg/L0.5 mg/L
2%
Ammonia0.039 mg/L0.5 mg/L
8%
Copper0.031 mg/L2 mg/L
2%
Fluoride0.08 mg/L1.5 mg/L
5%
Arsenic0.001 mg/L0.01 mg/L
10%
Cadmium0.00012 mg/L0.005 mg/L
2%
Chromium0.001 mg/L0.05 mg/L
2%
Mercury0.00004 mg/L0.001 mg/L
4%
Nickel0.0009 mg/L0.02 mg/L
5%
Antimony0.0003 mg/L0.005 mg/L
6%
Selenium0.0005 mg/L0.04 mg/L
1%
Outside your tap

Your river is the North and South Streams at Northbourne, rated moderate

The Environment Agency rated the North and South Streams at Northbourne as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants.

None of this is a test of your tap water. Environment Agency record · River health across England

CT15 in short

Tap water in CT15 (Dover) is supplied by Southern Water in the Dover Central zone and scores 9.4 out of 10, against an England and Wales average of 9.0. None of the 25 tested substances came close to a limit. The latest sample is from 30 April 2026.

  • Nitrate is the reading closest to its limit, at 51% of the 50 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 3rd cleanest of 6 areas tested in DoverSquarely mid-table for Dover, between CT13 on 9.5 and CT3 on 9.4.
  • Scores higher than 0 of 5 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

CT39.4 out of 10CT169.4 out of 10CT179.4 out of 10CT149.5 out of 10CT139.5 out of 10

Questions about CT15 water

Is CT15 tap water safe to drink?

Based on the latest tests, CT15 (Dover) water scores 9.4/10, which is safe. 0 of 25 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.

What contaminants are in CT15 water?

We tested 25 contaminants in CT15 water. None exceeded recommended safe levels.

Who supplies water in CT15?

CT15 (Dover) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.

Should I use a water filter in CT15?

CT15 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 CT15 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for CT15, 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.

How clean is the river near CT15?

The Environment Agency rated the North and South Streams at Northbourne as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants. This is a rating of the river, not of tap water in CT15, which is treated before it reaches homes.

Keep reading

How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map

River and groundwater readings near CT15

Environment Agency samples from rivers, groundwater and reservoirs nearby. Not your tap water. For scale they are shown against drinking water limits; rivers are judged against much stricter environmental standards, and on those every river in England fails for chemicals.

SubstanceReadingDrinking water limit
pH7.74 pHNone
Temperature15.9 °CNone
Conductivity651 µS/cmNone
Nitrate5.9 mg/L50 mg/L
Nitrite0.0094 mg/L0.5 mg/L
Phosphate0.03 mg/LNone
Dissolved Oxygen9.68 mg/LNone
Turbidity2.3 NTU4 NTU
Lead0.00005 mg/L0.01 mg/L
Zinc0.0071 mg/LNone
Nickel0.0018 mg/L0.02 mg/L
Manganese0.0014 mg/L0.05 mg/L
Copper0.00034 mg/L2 mg/L

Get alerts for your area

We'll email you when water quality data changes for CT15.

Source: Southern 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