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tapwater
England and Wales average 9.0

Tap water in TN31, RotherSafe to drink.Slightly hard.

Supplied by Southern Water. 14,006 samples, 22 substances, latest on 29 April 2026. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

9.3 / 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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Households concerned about PFAS and heavy metals

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High-volume under-sink filtration without RO complexity

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Basic chlorine and taste improvement on a budget

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What's in a glass of TN31 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 57% of it. 16 of 18 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.0022 mg/L, <1% of the 2 mg/L limitCopper<1%Chromium: 0.00019 mg/L, <1% of the 0.05 mg/L limitChromium<1%Cadmium: 0.000031 mg/L, <1% of the 0.005 mg/L limitCadmium<1%Lead: 0.00009 mg/L, <1% of the 0.01 mg/L limitLead<1%Selenium: 0.00043 mg/L, 1% of the 0.04 mg/L limitSelenium1%Arsenic: 0.00015 mg/L, 1% of the 0.01 mg/L limitArsenic1%Antimony: 0.000079 mg/L, 2% of the 0.005 mg/L limitAntimony2%Nitrite: 0.009 mg/L, 2% of the 0.5 mg/L limitNitrite2%Turbidity: 0.13 NTU, 3% of the 4 NTU limitTurbidity3%Manganese: 0.00178 mg/L, 4% of the 0.05 mg/L limitManganese4%Nickel: 0.00083 mg/L, 4% of the 0.02 mg/L limitNickel4%Iron: 0.00928 mg/L, 5% of the 0.2 mg/L limitIron5%Nitrate: 2.7 mg/L, 5% of the 50 mg/L limitNitrate5%Ammonia: 0.039 mg/L, 8% of the 0.5 mg/L limitAmmonia8%Colour: 3 mg/L Pt/Co, 15% of the 20 mg/L Pt/Co limitColour15%Aluminium: 0.0347 mg/L, 17% of the 0.2 mg/L limitAluminium17%Bromate: 0.0034 mg/L, 34% of the 0.01 mg/L limitBromate34%Trihalomethanes: 0.0568 mg/L, 57% of the 0.1 mg/L limitTrihalomethanes57%
  1. Trihalomethanes57%
  2. Bromate34%
  3. Aluminium17%
  4. Colour15%
  5. Ammonia8%
  6. Nitrate5%
  7. Iron5%
  8. Nickel4%
  9. Manganese4%
  10. Turbidity3%
  11. Nitrite2%
  12. Antimony2%
  13. Arsenic1%
  14. Selenium1%
  15. Lead<1%
  16. Cadmium<1%
  17. Chromium<1%
  18. Copper<1%
  • pH 7.7 pH
  • Conductivity 318 µS/cm
  • Coliform Bacteria none found
  • E. coli none found
All 22 results as a table
SubstanceResultLegal limitShare of limit
pH7.7 pHNo legal limit–
Aluminium0.0347 mg/L0.2 mg/L
17%
Iron0.00928 mg/L0.2 mg/L
5%
Manganese0.00178 mg/L0.05 mg/L
4%
Lead0.00009 mg/L0.01 mg/L
<1%
Conductivity318 µS/cmNo legal limit–
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Colour3 mg/L Pt/Co20 mg/L Pt/Co
15%
Turbidity0.13 NTU4 NTU
3%
Nitrate2.7 mg/L50 mg/L
5%
Ammonia0.039 mg/L0.5 mg/L
8%
Copper0.0022 mg/L2 mg/L
<1%
Bromate0.0034 mg/L0.01 mg/L
34%
Nitrite0.009 mg/L0.5 mg/L
2%
Arsenic0.00015 mg/L0.01 mg/L
1%
Cadmium0.000031 mg/L0.005 mg/L
<1%
Chromium0.00019 mg/L0.05 mg/L
<1%
Nickel0.00083 mg/L0.02 mg/L
4%
Antimony0.000079 mg/L0.005 mg/L
2%
Selenium0.00043 mg/L0.04 mg/L
1%
Trihalomethanes0.0568 mg/L0.1 mg/L
57%

150mg of limescale minerals in every litre, typical for the TN area. TN31 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 Tillingham, rated moderate

The Environment Agency rated the Tillingham 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 and dissolved oxygen. 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

TN31 in short

Tap water in TN31 (Rother) is supplied by Southern Water in the Rother Central zone and scores 9.3 out of 10, against an England and Wales average of 9.0. None of the 22 tested substances came close to a limit. The latest sample is from 29 April 2026.

  • Trihalomethanes is the reading closest to its limit, at 57% of the 0.1 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 6th cleanest of 8 areas tested in Rother2 areas in Rother scored lower. The best is TN40 on 9.7.
  • 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

TN369.3 out of 10 · 150 mg/LTN58.3 out of 10 · 150 mg/LTN199.6 out of 10 · 150 mg/LTN409.7 out of 10 · 150 mg/LTN329.6 out of 10 · 150 mg/LTN339.5 out of 10 · 150 mg/LTN399.5 out of 10 · 150 mg/L

Questions about TN31 water

Is TN31 tap water safe to drink?

Based on the latest tests, TN31 (Rother) water scores 9.3/10, which is safe. 0 of 22 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.

What contaminants are in TN31 water?

We tested 22 contaminants in TN31 water. None exceeded recommended safe levels.

Who supplies water in TN31?

TN31 (Rother) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.

Is TN31 water hard or soft?

No hardness reading has been published for TN31 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 TN31?

TN31 water scored 9.3/10 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 TN31 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for TN31, 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 TN31?

The Environment Agency rated the Tillingham 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 and dissolved oxygen. 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 TN31, 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 TN31

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
Turbidity12 NTU4 NTU
Boron0.11 mg/L1 mg/L
pH0.15 pHNone
Dissolved Oxygen7.74 mg/LNone
Iron0.04 mg/L0.2 mg/L
Temperature8 °CNone
Conductivity414 µS/cmNone
Ammonia0.051 mg/L0.5 mg/L
Nitrate1.9 mg/L50 mg/L
Nitrite0.0094 mg/L0.5 mg/L
Phosphate0.036 mg/LNone
Copper0.00243 mg/L2 mg/L
Zinc0.0113 mg/LNone

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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