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tapwater
England and Wales average 9.0

Tap water in PO13, GosportSafe to drink.

Supplied by Southern Water. 3,933 samples, 21 substances, latest on 20 December 2024. Everything is inside the legal limit, and nothing comes close to it.

See the filter we recommendSee everything that was tested

8.7 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of PO13 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 64% of it. 18 of 20 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitSelenium: 0.0008 mg/L, 2% of the 0.04 mg/L limitSelenium2%Nitrite: 0.011 mg/L, 2% of the 0.5 mg/L limitNitrite2%Mercury: 0.00004 mg/L, 4% of the 0.001 mg/L limitMercury4%Antimony: 0.0002 mg/L, 4% of the 0.005 mg/L limitAntimony4%Aluminium: 0.0081 mg/L, 4% of the 0.2 mg/L limitAluminium4%Cadmium: 0.00022 mg/L, 4% of the 0.005 mg/L limitCadmium4%Chromium: 0.0023 mg/L, 5% of the 0.05 mg/L limitChromium5%Lead: 0.0005 mg/L, 5% of the 0.01 mg/L limitLead5%Manganese: 0.0025 mg/L, 5% of the 0.05 mg/L limitManganese5%Iron: 0.0138 mg/L, 7% of the 0.2 mg/L limitIron7%Turbidity: 0.28 NTU, 7% of the 4 NTU limitTurbidity7%Fluoride: 0.115 mg/L, 8% of the 1.5 mg/L limitFluoride8%Bromate: 0.0008 mg/L, 8% of the 0.01 mg/L limitBromate8%Colour: 1.93 mg/L Pt/Co, 10% of the 20 mg/L Pt/Co limitColour10%Arsenic: 0.001 mg/L, 10% of the 0.01 mg/L limitArsenic10%Boron: 0.14 mg/L, 14% of the 1 mg/L limitBoron14%Trihalomethanes: 0.0175 mg/L, 17% of the 0.1 mg/L limitTrihalomethanes17%Nickel: 0.0043 mg/L, 22% of the 0.02 mg/L limitNickel22%Copper: 0.935 mg/L, 47% of the 2 mg/L limitCopper47%Nitrate: 31.9 mg/L, 64% of the 50 mg/L limitNitrate64%
  1. Nitrate64%
  2. Copper47%
  3. Nickel22%
  4. Trihalomethanes17%
  5. Boron14%
  6. Arsenic10%
  7. Colour10%
  8. Bromate8%
  9. Fluoride8%
  10. Turbidity7%
  11. Iron7%
  12. Lead5%
  13. Manganese5%
  14. Chromium5%
  15. Cadmium4%
  16. Aluminium4%
  17. Mercury4%
  18. Antimony4%
  19. Nitrite2%
  20. Selenium2%
  • Conductivity 558 µS/cm
All 21 results as a table
SubstanceResultLegal limitShare of limit
Turbidity0.28 NTU4 NTU
7%
Conductivity558 µS/cmNo legal limit–
Colour1.93 mg/L Pt/Co20 mg/L Pt/Co
10%
Aluminium0.0081 mg/L0.2 mg/L
4%
Iron0.0138 mg/L0.2 mg/L
7%
Manganese0.0025 mg/L0.05 mg/L
5%
Trihalomethanes0.0175 mg/L0.1 mg/L
17%
Boron0.14 mg/L1 mg/L
14%
Chromium0.0023 mg/L0.05 mg/L
5%
Cadmium0.00022 mg/L0.005 mg/L
4%
Mercury0.00004 mg/L0.001 mg/L
4%
Lead0.0005 mg/L0.01 mg/L
5%
Nickel0.0043 mg/L0.02 mg/L
22%
Copper0.935 mg/L2 mg/L
47%
Nitrite0.011 mg/L0.5 mg/L
2%
Nitrate31.9 mg/L50 mg/L
64%
Fluoride0.115 mg/L1.5 mg/L
8%
Antimony0.0002 mg/L0.005 mg/L
4%
Arsenic0.001 mg/L0.01 mg/L
10%
Selenium0.0008 mg/L0.04 mg/L
2%
Bromate0.0008 mg/L0.01 mg/L
8%
Outside your tap

Your river is the Alver, rated bad

The Environment Agency rated the Alver as bad for ecological health in its 2025 assessment, meaning the river is severely damaged, with most of the expected wildlife missing. It is held back by fish, insects and other small river life 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

Within 10 km

32

forever-chemical detections in nearby rivers and groundwater

At 2 sites. The highest was PFOS at 0.004 µg/L, at Priors Hold Farm, Wallington, 7.9 km away, in July 2023. These are river and borehole samples, not tests of your tap water.

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

PO13 in short

Tap water in PO13 (Gosport) is supplied by Southern Water in the Gosport Central zone and scores 8.7 out of 10, against an England and Wales average of 9.0. None of the 21 tested substances came close to a limit. The latest sample is from 20 December 2024.

  • Nitrate is the reading closest to its limit, at 64% 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 2 monitoring sites within 10 kmThose are river and groundwater samples, not tap water. The highest was PFOS about 7.9 km away. What was measured
  • Scores higher than 1 of 3 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

PO128.9 out of 10PO149.2 out of 10PO168.4 out of 10

Questions about PO13 water

Is PO13 tap water safe to drink?

Based on the latest tests, PO13 (Gosport) water scores 8.7/10, which is safe. 0 of 21 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.

What contaminants are in PO13 water?

We tested 21 contaminants in PO13 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 PO13?

PO13 (Gosport) 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 PO13?

PO13 water scored 8.7/10 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 PO13 water?

The tap-water tests we hold for PO13 do not include a PFAS result. Environment Agency monitoring found PFAS in 32 river and groundwater samples from 2 sites within 10 km of PO13, the highest being PFOS at 0.004 µg/L about 7.9 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 river near PO13?

The Environment Agency rated the Alver as bad for ecological health in its 2025 assessment, meaning the river is severely damaged, with most of the expected wildlife missing. It is held back by fish, insects and other small river life 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 PO13, 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 PO13

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
pH7.88 pHNone
Temperature18.3 °CNone
Conductivity1242 µS/cmNone
Ammonia0.044 mg/L0.5 mg/L
Nitrate4.4 mg/L50 mg/L
Nitrite0.046 mg/L0.5 mg/L
Phosphate0.5 mg/LNone
Dissolved Oxygen8.15 mg/LNone
Copper0.0064 mg/L2 mg/L
Zinc0.0234 mg/LNone

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We'll email you when water quality data changes for PO13.

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