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tapwater
England and Wales average 9.0

Tap water in TN25, AshfordSafe to drink.Slightly hard.

Supplied by Southern Water. 102 samples, 24 substances, latest on 24 November 2025. 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. The specks are the minerals that make water hard.

What to do about it

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Basic chlorine and taste improvement on a budget

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What's in a glass of TN25 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 limitAntimony: 0.000027 mg/L, <1% of the 0.005 mg/L limitAntimony<1%Manganese: 0.000432 mg/L, <1% of the 0.05 mg/L limitManganese<1%Selenium: 0.000352 mg/L, <1% of the 0.04 mg/L limitSelenium<1%Aluminium: 0.00199 mg/L, <1% of the 0.2 mg/L limitAluminium<1%Chromium: 0.000498 mg/L, <1% of the 0.05 mg/L limitChromium<1%Cadmium: 0.000054 mg/L, 1% of the 0.005 mg/L limitCadmium1%Copper: 0.032 mg/L, 2% of the 2 mg/L limitCopper2%Arsenic: 0.000193 mg/L, 2% of the 0.01 mg/L limitArsenic2%Nitrite: 0.01 mg/L, 2% of the 0.5 mg/L limitNitrite2%Mercury: 0.000023 mg/L, 2% of the 0.001 mg/L limitMercury2%Turbidity: 0.1 NTU, 3% of the 4 NTU limitTurbidity3%Nickel: 0.000611 mg/L, 3% of the 0.02 mg/L limitNickel3%Trihalomethanes: 0.00339 mg/L, 3% of the 0.1 mg/L limitTrihalomethanes3%Iron: 0.00897 mg/L, 4% of the 0.2 mg/L limitIron4%Boron: 0.046 mg/L, 5% of the 1 mg/L limitBoron5%Fluoride: 0.085 mg/L, 6% of the 1.5 mg/L limitFluoride6%Lead: 0.000673 mg/L, 7% of the 0.01 mg/L limitLead7%Colour: 2 mg/L Pt/Co, 10% of the 20 mg/L Pt/Co limitColour10%Ammonia: 0.06 mg/L, 12% of the 0.5 mg/L limitAmmonia12%Bromate: 0.00147 mg/L, 15% of the 0.01 mg/L limitBromate15%Nitrate: 25.7 mg/L, 51% of the 50 mg/L limitNitrate51%
  1. Nitrate51%
  2. Bromate15%
  3. Ammonia12%
  4. Colour10%
  5. Lead7%
  6. Fluoride6%
  7. Boron5%
  8. Iron4%
  9. Trihalomethanes3%
  10. Nickel3%
  11. Turbidity3%
  12. Mercury2%
  13. Nitrite2%
  14. Arsenic2%
  15. Copper2%
  16. Cadmium1%
  17. Chromium<1%
  18. Aluminium<1%
  19. Selenium<1%
  20. Manganese<1%
  21. Antimony<1%
  • Coliform Bacteria none found
  • E. coli none found
  • Conductivity 507 µS/cm
All 24 results as a table
SubstanceResultLegal limitShare of limit
Copper0.032 mg/L2 mg/L
2%
Coliform Bacteria0 count/100mlMust be zeroNone found
Antimony0.000027 mg/L0.005 mg/L
<1%
Colour2 mg/L Pt/Co20 mg/L Pt/Co
10%
E. coli0 count/100mlMust be zeroNone found
Conductivity507 µS/cmNo legal limit–
Turbidity0.1 NTU4 NTU
3%
Cadmium0.000054 mg/L0.005 mg/L
1%
Fluoride0.085 mg/L1.5 mg/L
6%
Boron0.046 mg/L1 mg/L
5%
Nitrite0.01 mg/L0.5 mg/L
2%
Ammonia0.06 mg/L0.5 mg/L
12%
Mercury0.000023 mg/L0.001 mg/L
2%
Bromate0.00147 mg/L0.01 mg/L
15%
Iron0.00897 mg/L0.2 mg/L
4%
Nickel0.000611 mg/L0.02 mg/L
3%
Chromium0.000498 mg/L0.05 mg/L
<1%
Nitrate25.7 mg/L50 mg/L
51%
Lead0.000673 mg/L0.01 mg/L
7%
Trihalomethanes0.00339 mg/L0.1 mg/L
3%
Manganese0.000432 mg/L0.05 mg/L
<1%
Arsenic0.000193 mg/L0.01 mg/L
2%
Aluminium0.00199 mg/L0.2 mg/L
<1%
Selenium0.000352 mg/L0.04 mg/L
<1%

150mg of limescale minerals in every litre, typical for the TN area. TN25 has no reading of its own.

Middling hardness. Some scale, slowly

Below the point where a softener pays for itself. Descaling the kettle now and then is all most homes need.

Soft400 mg/L
Outside your tap

Your river is the Aylesford Stream, rated moderate

The Environment Agency rated the Aylesford Stream 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, ammonia and phosphate. 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. Its ecological rating has improved since the previous assessment.

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

TN25 in short

Tap water in TN25 (Ashford) is supplied by Southern Water in the Ashford Central zone and scores 9.4 out of 10, against an England and Wales average of 9.0. None of the 24 tested substances came close to a limit. The latest sample is from 24 November 2025.

  • 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 AshfordSquarely mid-table for Ashford, between TN26 on 9.8 and TN30 on 4.1.
  • Moderately hard water at 150 mg/LSome scale over time across the TN postcode area, but not enough to justify a softener for most homes. How hardness is measured

Next door

TN239.0 out of 10 · 150 mg/LTN304.1 out of 10 · 150 mg/LTN269.8 out of 10 · 150 mg/LTN278.5 out of 10 · 150 mg/LTN249.6 out of 10 · 150 mg/L

Questions about TN25 water

Is TN25 tap water safe to drink?

Based on the latest tests, TN25 (Ashford) water scores 9.4/10, which is safe. 0 of 24 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.

What contaminants are in TN25 water?

We tested 24 contaminants in TN25 water. None exceeded recommended safe levels.

Who supplies water in TN25?

TN25 (Ashford) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.

Is TN25 water hard or soft?

No hardness reading has been published for TN25 itself. Across the TN postcode area the typical value is 150 mg/L CaCO3, which is classified as moderately hard. This is a moderate hardness level.

Should I use a water filter in TN25?

TN25 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 TN25 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for TN25, 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 TN25?

The Environment Agency rated the Aylesford Stream 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, ammonia and phosphate. 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. Its ecological rating has improved since the previous assessment. This is a rating of the river, not of tap water in TN25, 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 TN25

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
pH7.57 pHNone
Temperature18.3 °CNone
Conductivity839 µS/cmNone
Ammonia0.044 mg/L0.5 mg/L
Nitrate20 mg/L50 mg/L
Nitrite0.066 mg/L0.5 mg/L
Phosphate0.18 mg/LNone
Dissolved Oxygen6.78 mg/LNone
Cadmium0.00012 mg/L0.005 mg/L
Lead0.00001 mg/L0.01 mg/L
Nickel0.0024 mg/L0.02 mg/L
Zinc0.0077 mg/LNone
Copper0.0043 mg/L2 mg/L

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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