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tapwater
England and Wales average 9.0

Tap water in PO31, Isle of WightSafe to drink.

Supplied by Southern Water. 10,243 samples, 22 substances, latest on 14 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.

What to do about it

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Households concerned about PFAS and heavy metals

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Basic chlorine and taste improvement on a budget

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What's in a glass of PO31 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 46% of it. 16 of 18 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.0023 mg/L, <1% of the 2 mg/L limitCopper<1%Nitrite: 0.004 mg/L, <1% of the 0.5 mg/L limitNitrite<1%Lead: 0.00012 mg/L, 1% of the 0.01 mg/L limitLead1%Bromate: 0.00013 mg/L, 1% of the 0.01 mg/L limitBromate1%Chromium: 0.001 mg/L, 2% of the 0.05 mg/L limitChromium2%Selenium: 0.0008 mg/L, 2% of the 0.04 mg/L limitSelenium2%Cadmium: 0.00012 mg/L, 2% of the 0.005 mg/L limitCadmium2%Turbidity: 0.13 NTU, 3% of the 4 NTU limitTurbidity3%Manganese: 0.00178 mg/L, 4% of the 0.05 mg/L limitManganese4%Antimony: 0.0002 mg/L, 4% of the 0.005 mg/L limitAntimony4%Aluminium: 0.0113 mg/L, 6% of the 0.2 mg/L limitAluminium6%Nickel: 0.0014 mg/L, 7% of the 0.02 mg/L limitNickel7%Iron: 0.015 mg/L, 8% of the 0.2 mg/L limitIron8%Ammonia: 0.039 mg/L, 8% of the 0.5 mg/L limitAmmonia8%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%Trihalomethanes: 0.0378 mg/L, 38% of the 0.1 mg/L limitTrihalomethanes38%Nitrate: 23.1 mg/L, 46% of the 50 mg/L limitNitrate46%
  1. Nitrate46%
  2. Trihalomethanes38%
  3. Colour15%
  4. Arsenic10%
  5. Ammonia8%
  6. Iron8%
  7. Nickel7%
  8. Aluminium6%
  9. Antimony4%
  10. Manganese4%
  11. Turbidity3%
  12. Cadmium2%
  13. Chromium2%
  14. Selenium2%
  15. Bromate1%
  16. Lead1%
  17. Nitrite<1%
  18. Copper<1%
  • Coliform Bacteria none found
  • E. coli none found
  • Conductivity 551 µS/cm
  • pH 7.5 pH
All 22 results as a table
SubstanceResultLegal limitShare of limit
Turbidity0.13 NTU4 NTU
3%
Aluminium0.0113 mg/L0.2 mg/L
6%
Iron0.015 mg/L0.2 mg/L
8%
Manganese0.00178 mg/L0.05 mg/L
4%
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Conductivity551 µS/cmNo legal limit–
pH7.5 pHNo legal limit–
Lead0.00012 mg/L0.01 mg/L
1%
Colour3 mg/L Pt/Co20 mg/L Pt/Co
15%
Nitrate23.1 mg/L50 mg/L
46%
Nitrite0.004 mg/L0.5 mg/L
<1%
Ammonia0.039 mg/L0.5 mg/L
8%
Copper0.0023 mg/L2 mg/L
<1%
Arsenic0.001 mg/L0.01 mg/L
10%
Cadmium0.00012 mg/L0.005 mg/L
2%
Chromium0.001 mg/L0.05 mg/L
2%
Nickel0.0014 mg/L0.02 mg/L
7%
Antimony0.0002 mg/L0.005 mg/L
4%
Selenium0.0008 mg/L0.04 mg/L
2%
Trihalomethanes0.0378 mg/L0.1 mg/L
38%
Bromate0.00013 mg/L0.01 mg/L
1%
Outside your tap

Your estuary is the Medina, rated moderate

The Environment Agency rated the Medina as moderate for ecological health in its 2025 assessment, meaning the estuary is noticeably changed by pollution or engineering. It is held back by nitrogen. 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

Within 10 km

9

forever-chemical detections in nearby rivers and groundwater

At 1 site. The highest was PFPeA at 0.012 µg/L, at Hatchet Stream at St Leonards, 8.8 km away, in February 2026. These are river and borehole samples, not tests of your tap water.

Every PFAS sample around Southampton · Which filters remove PFAS · PFAS explained

PO31 in short

Tap water in PO31 (Isle of Wight) is supplied by Southern Water in the Isle of Wight 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 14 April 2026.

  • The cleanest tap water of the 12 areas tested in Isle of WightPO31 scores 9.3 out of 10, ahead of PO33 in second place on 9.3.
  • Nitrate is the reading closest to its limit, at 46% of the 50 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • PFAS found at 1 monitoring site within 10 kmThose are river and groundwater samples, not tap water. The highest was PFPeA about 8.8 km away. What was measured

Next door

PO379.2 out of 10PO309.2 out of 10PO399.1 out of 10PO349.3 out of 10PO419.2 out of 10PO359.3 out of 10PO409.2 out of 10PO329.1 out of 10PO369.3 out of 10PO389.2 out of 10

Questions about PO31 water

Is PO31 tap water safe to drink?

Based on the latest tests, PO31 (Isle of Wight) 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 PO31 water?

We tested 22 contaminants in PO31 water. None exceeded recommended safe levels. PFAS (forever chemicals) were also measured in rivers and groundwater within 10 km, though not in the tap-water tests themselves.

Who supplies water in PO31?

PO31 (Isle of Wight) 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 PO31?

PO31 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 PO31 water?

The tap-water tests we hold for PO31 do not include a PFAS result. Environment Agency monitoring found PFAS in 9 river and groundwater samples from 1 sites within 10 km of PO31, the highest being PFPeA at 0.012 µg/L about 8.8 km away. These are environmental samples, not tests of tap water. The UK currently has no legal limit for PFAS in drinking water; the Drinking Water Inspectorate uses a 0.1 µg/L guideline for individual compounds. Reverse osmosis filters can reduce PFAS levels.

How clean is the estuary near PO31?

The Environment Agency rated the Medina as moderate for ecological health in its 2025 assessment, meaning the estuary is noticeably changed by pollution or engineering. It is held back by nitrogen. 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 estuary, not of tap water in PO31, which is treated before it reaches homes.

Keep reading

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

River and groundwater readings near PO31

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
Temperature15.8 °CNone
Nitrate0.99 mg/L50 mg/L
Phosphate0.039 mg/LNone
pH7.62 pHNone
Conductivity331 µS/cmNone
Ammonia0.0038 mg/L0.5 mg/L
Dissolved Oxygen7.91 mg/LNone
Nitrite0.0029 mg/L0.5 mg/L
Copper0.00265 mg/L2 mg/L
Zinc0.0068 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