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tapwater
England and Wales average 9.0

Tap water in PO39, Isle of WightSafe to drink.

Supplied by Southern Water. 3,045 samples, 22 substances, latest on 27 April 2026. Everything is inside the legal limit. One result, nitrate, sits close to the line.

See the filter we recommendSee everything that was tested

9.1 / 10

The tank is as full as the score.

What to do about it

Waterdrop G3P600 Reverse Osmosis

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Removes nitrate, the result that stood out in PO39.

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Osmio PRO-III Ultimate Whole House

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Removes nitrate, the result that stood out in PO39.

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ZeroWater 12-Cup Ready-Pour

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Removes nitrate, the result that stood out in PO39.

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What's in a glass of PO39 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 79% of it. 16 of 18 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitNitrite: 0.004 mg/L, <1% of the 0.5 mg/L limitNitrite<1%Lead: 0.00019 mg/L, 2% of the 0.01 mg/L limitLead2%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%Aluminium: 0.0061 mg/L, 3% of the 0.2 mg/L limitAluminium3%Turbidity: 0.13 NTU, 3% of the 4 NTU limitTurbidity3%Manganese: 0.0017 mg/L, 3% of the 0.05 mg/L limitManganese3%Ammonia: 0.02 mg/L, 4% of the 0.5 mg/L limitAmmonia4%Antimony: 0.0002 mg/L, 4% of the 0.005 mg/L limitAntimony4%Bromate: 0.00054 mg/L, 5% of the 0.01 mg/L limitBromate5%Nickel: 0.0013 mg/L, 7% of the 0.02 mg/L limitNickel7%Iron: 0.0163 mg/L, 8% of the 0.2 mg/L limitIron8%Arsenic: 0.001 mg/L, 10% of the 0.01 mg/L limitArsenic10%Copper: 0.227 mg/L, 11% of the 2 mg/L limitCopper11%Colour: 3 mg/L Pt/Co, 15% of the 20 mg/L Pt/Co limitColour15%Trihalomethanes: 0.0293 mg/L, 29% of the 0.1 mg/L limitTrihalomethanes29%Nitrate: 39.7 mg/L, 79% of the 50 mg/L limitNitrate79%
  1. Nitrate79%
  2. Trihalomethanes29%
  3. Colour15%
  4. Copper11%
  5. Arsenic10%
  6. Iron8%
  7. Nickel7%
  8. Bromate5%
  9. Ammonia4%
  10. Antimony4%
  11. Manganese3%
  12. Turbidity3%
  13. Aluminium3%
  14. Cadmium2%
  15. Chromium2%
  16. Selenium2%
  17. Lead2%
  18. Nitrite<1%
  • Coliform Bacteria none found
  • E. coli none found
  • Conductivity 555 µS/cm
  • pH 7.6 pH
All 22 results as a table
SubstanceResultLegal limitShare of limit
Nitrate39.7 mg/L50 mg/L
79%
Turbidity0.13 NTU4 NTU
3%
Iron0.0163 mg/L0.2 mg/L
8%
Manganese0.0017 mg/L0.05 mg/L
3%
Lead0.00019 mg/L0.01 mg/L
2%
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Conductivity555 µS/cmNo legal limit–
Trihalomethanes0.0293 mg/L0.1 mg/L
29%
Bromate0.00054 mg/L0.01 mg/L
5%
Nitrite0.004 mg/L0.5 mg/L
<1%
Ammonia0.02 mg/L0.5 mg/L
4%
Aluminium0.0061 mg/L0.2 mg/L
3%
Copper0.227 mg/L2 mg/L
11%
Arsenic0.001 mg/L0.01 mg/L
10%
Cadmium0.00012 mg/L0.005 mg/L
2%
Chromium0.001 mg/L0.05 mg/L
2%
Nickel0.0013 mg/L0.02 mg/L
7%
Antimony0.0002 mg/L0.005 mg/L
4%
Selenium0.0008 mg/L0.04 mg/L
2%
Colour3 mg/L Pt/Co20 mg/L Pt/Co
15%
pH7.6 pHNo legal limit–
Outside your tap

Your coastal water is the Solent, rated moderate

The Environment Agency rated the Solent as moderate for ecological health in its 2025 assessment, meaning the coastal water is noticeably changed by pollution or engineering. It is held back by nitrogen and seagrass and saltmarsh. 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

PO39 in short

Tap water in PO39 (Isle of Wight) is supplied by Southern Water in the Isle of Wight Central zone and scores 9.1 out of 10, against an England and Wales average of 9.0. 1 of 22 tested substances was close to or over a limit. The latest sample is from 27 April 2026.

  • Nitrate is within its legal limit but flagged, at 79% of the 50 mg/L maximumAnything over three quarters of a limit is flagged here as worth watching. It has not gone over. See every reading
  • The lowest score of the 12 areas tested in Isle of WightPO39 scores 9.1 out of 10. The best in Isle of Wight, PO31, scores 9.3.
  • Every one of the 10 neighbouring districts scores higherPO35 next door scores 9.3, against 9.1 here. Supply zones, not distance, explain the gap. See PO35

Next door

PO389.2 out of 10PO309.2 out of 10PO359.3 out of 10PO419.2 out of 10PO369.3 out of 10PO409.2 out of 10PO339.3 out of 10PO319.3 out of 10PO379.2 out of 10PO349.3 out of 10

Questions about PO39 water

Is PO39 tap water safe to drink?

Based on the latest tests, PO39 (Isle of Wight) water scores 9.1/10, which is safe. 1 of 22 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.

What contaminants are in PO39 water?

We tested 22 contaminants in PO39 water. 1 were flagged, including Nitrate.

Who supplies water in PO39?

PO39 (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 PO39?

With 1 contaminant above recommended levels in PO39, a water filter could help. A filter jug or under-sink filter can reduce most common contaminants. See our filter recommendations for your area.

Are there PFAS forever chemicals in PO39 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for PO39, 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 coastal water near PO39?

The Environment Agency rated the Solent as moderate for ecological health in its 2025 assessment, meaning the coastal water is noticeably changed by pollution or engineering. It is held back by nitrogen and seagrass and saltmarsh. 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 coastal water, not of tap water in PO39, which is treated before it reaches homes.

Keep reading

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

River and groundwater readings near PO39

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
pH7.45 pHNone
Temperature17.7 °CNone
Conductivity281 µS/cmNone
Nitrate1.9 mg/L50 mg/L
Phosphate0.037 mg/LNone
Dissolved Oxygen8.53 mg/LNone
Nitrite0.0048 mg/L0.5 mg/L
Ammonia0.049 mg/L0.5 mg/L
Zinc0.0059 mg/LNone
Copper0.0035 mg/L2 mg/L

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We'll email you when water quality data changes for PO39.

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