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England and Wales average 9.0

Tap water in PO11, HavantNitrite is over the limit.

Supplied by Southern Water. 1,424 samples, 21 substances, latest on 18 December 2024. Nitrite came in above the legal limit. Everything else passed.

See the filter we recommendSee everything that was tested

8.5 / 10

The tank is as full as the score.

What to do about it

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What's in a glass of PO11 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.

Nitrite is over its legal limit, at 131% of it.

0%25%50%75%limitLegal limitSelenium: 0.0008 mg/L, 2% of the 0.04 mg/L limitSelenium2%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%Cadmium: 0.00022 mg/L, 4% of the 0.005 mg/L limitCadmium4%Aluminium: 0.0091 mg/L, 5% of the 0.2 mg/L limitAluminium5%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%Fluoride: 0.088 mg/L, 6% of the 1.5 mg/L limitFluoride6%Nickel: 0.0013 mg/L, 7% of the 0.02 mg/L limitNickel7%Iron: 0.0138 mg/L, 7% of the 0.2 mg/L limitIron7%Turbidity: 0.28 NTU, 7% of the 4 NTU limitTurbidity7%Bromate: 0.0008 mg/L, 8% of the 0.01 mg/L limitBromate8%Copper: 0.172 mg/L, 9% of the 2 mg/L limitCopper9%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%Trihalomethanes: 0.0112 mg/L, 11% of the 0.1 mg/L limitTrihalomethanes11%Boron: 0.14 mg/L, 14% of the 1 mg/L limitBoron14%Nitrate: 32.7 mg/L, 65% of the 50 mg/L limitNitrate65%Nitrite: 0.653 mg/L, 131% of the 0.5 mg/L limitNitrite131%
  1. Nitrite131%
  2. Nitrate65%
  3. Boron14%
  4. Trihalomethanes11%
  5. Arsenic10%
  6. Colour10%
  7. Copper9%
  8. Bromate8%
  9. Turbidity7%
  10. Iron7%
  11. Nickel7%
  12. Fluoride6%
  13. Lead5%
  14. Manganese5%
  15. Chromium5%
  16. Aluminium5%
  17. Cadmium4%
  18. Mercury4%
  19. Antimony4%
  20. Selenium2%
  • Conductivity 512 µS/cm
All 21 results as a table
SubstanceResultLegal limitShare of limit
Nitrite0.653 mg/L0.5 mg/L
131%
Lead0.0005 mg/L0.01 mg/L
5%
Nickel0.0013 mg/L0.02 mg/L
7%
Copper0.172 mg/L2 mg/L
9%
Turbidity0.28 NTU4 NTU
7%
Conductivity512 µS/cmNo legal limit–
Aluminium0.0091 mg/L0.2 mg/L
5%
Iron0.0138 mg/L0.2 mg/L
7%
Manganese0.0025 mg/L0.05 mg/L
5%
Colour1.93 mg/L Pt/Co20 mg/L Pt/Co
10%
Nitrate32.7 mg/L50 mg/L
65%
Trihalomethanes0.0112 mg/L0.1 mg/L
11%
Mercury0.00004 mg/L0.001 mg/L
4%
Boron0.14 mg/L1 mg/L
14%
Chromium0.0023 mg/L0.05 mg/L
5%
Cadmium0.00022 mg/L0.005 mg/L
4%
Fluoride0.088 mg/L1.5 mg/L
6%
Bromate0.0008 mg/L0.01 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%
Outside your tap

Your estuary is the Chichester Harbour, rated moderate

The Environment Agency rated the Chichester Harbour 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, seagrass and saltmarsh and seaweed. 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

11

forever-chemical detections in nearby rivers and groundwater

At 1 site. The highest was PFHxA at 0.04 µg/L, at Hermitage Stream at B2150 Havant - New Road, 7.2 km away, in June 2024. These are river and borehole samples, not tests of your tap water.

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

PO11 in short

Tap water in PO11 (Havant) is supplied by Southern Water in the Havant Central zone and scores 8.5 out of 10, against an England and Wales average of 9.0. 1 of 21 tested substances was close to or over a limit. The latest sample is from 18 December 2024.

  • Nitrite was measured at 0.65 mg/L, 31% over the UK limitIt is the only one of 21 tested substances to go over its limit. See the full results
  • 2nd cleanest of 3 areas tested in HavantSquarely mid-table for Havant, between PO9 on 9.1 and PO7 on 8.1.
  • 0.5 points below the national average of 9Below the typical tested district in the UK, which is worth knowing before you choose a filter. Compare every area

Next door

PO99.1 out of 10PO78.1 out of 10

Questions about PO11 water

Is PO11 tap water safe to drink?

Based on the latest tests, PO11 (Havant) water scores 8.5/10, which is safe. 1 of 21 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.

What contaminants are in PO11 water?

We tested 21 contaminants in PO11 water. 1 were flagged, including Nitrite. 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 PO11?

PO11 (Havant) 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 PO11?

With 1 contaminant above recommended levels in PO11, a water filter could help. A reverse osmosis or activated carbon filter is recommended for PFAS removal. See our filter recommendations for your area.

Are there PFAS forever chemicals in PO11 water?

The tap-water tests we hold for PO11 do not include a PFAS result. Environment Agency monitoring found PFAS in 11 river and groundwater samples from 1 sites within 10 km of PO11, the highest being PFHxA at 0.04 µg/L about 7.2 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 PO11?

The Environment Agency rated the Chichester Harbour 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, seagrass and saltmarsh and seaweed. 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 PO11, which is treated before it reaches homes.

Keep reading

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

River and groundwater readings near PO11

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
pH8.22 pHNone
Temperature15.2 °CNone
Conductivity712 µS/cmNone
Ammonia0.078 mg/L0.5 mg/L
Nitrate7.2 mg/L50 mg/L
Nitrite0.066 mg/L0.5 mg/L
Phosphate0.037 mg/LNone
Dissolved Oxygen8.74 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