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tapwater
England and Wales average 9.0

Tap water in GU33, East HampshireSafe to drink.Slightly hard.

Supplied by Southern Water. 2,109 samples, 22 substances, latest on 17 March 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 GU33 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 37% of it. 16 of 18 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.009 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: 0.00009 mg/L, <1% of the 0.01 mg/L limitLead<1%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%Ammonia: 0.025 mg/L, 5% of the 0.5 mg/L limitAmmonia5%Iron: 0.0105 mg/L, 5% of the 0.2 mg/L limitIron5%Aluminium: 0.0113 mg/L, 6% of the 0.2 mg/L limitAluminium6%Bromate: 0.00084 mg/L, 8% of the 0.01 mg/L limitBromate8%Arsenic: 0.001 mg/L, 10% of the 0.01 mg/L limitArsenic10%Nickel: 0.002 mg/L, 10% of the 0.02 mg/L limitNickel10%Colour: 3 mg/L Pt/Co, 15% of the 20 mg/L Pt/Co limitColour15%Trihalomethanes: 0.0341 mg/L, 34% of the 0.1 mg/L limitTrihalomethanes34%Nitrate: 18.6 mg/L, 37% of the 50 mg/L limitNitrate37%
  1. Nitrate37%
  2. Trihalomethanes34%
  3. Colour15%
  4. Arsenic10%
  5. Nickel10%
  6. Bromate8%
  7. Aluminium6%
  8. Iron5%
  9. Ammonia5%
  10. Antimony4%
  11. Manganese4%
  12. Turbidity3%
  13. Cadmium2%
  14. Chromium2%
  15. Selenium2%
  16. Lead<1%
  17. Nitrite<1%
  18. Copper<1%
  • pH 7.7 pH
  • Coliform Bacteria none found
  • E. coli none found
  • Conductivity 420 µS/cm
All 22 results as a table
SubstanceResultLegal limitShare of limit
Colour3 mg/L Pt/Co20 mg/L Pt/Co
15%
Turbidity0.13 NTU4 NTU
3%
pH7.7 pHNo legal limit–
Aluminium0.0113 mg/L0.2 mg/L
6%
Iron0.0105 mg/L0.2 mg/L
5%
Manganese0.00178 mg/L0.05 mg/L
4%
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Conductivity420 µS/cmNo legal limit–
Nitrate18.6 mg/L50 mg/L
37%
Ammonia0.025 mg/L0.5 mg/L
5%
Lead0.00009 mg/L0.01 mg/L
<1%
Nitrite0.004 mg/L0.5 mg/L
<1%
Copper0.009 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%
Nickel0.002 mg/L0.02 mg/L
10%
Antimony0.0002 mg/L0.005 mg/L
4%
Selenium0.0008 mg/L0.04 mg/L
2%
Trihalomethanes0.0341 mg/L0.1 mg/L
34%
Bromate0.00084 mg/L0.01 mg/L
8%

154mg of limescale minerals in every litre, typical for the GU area. GU33 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 Western Rother (Upstream Petersfield), rated moderate

The Environment Agency rated the Western Rother (Upstream Petersfield) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by phosphate. 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. Its ecological rating has improved since the previous assessment.

None of this is a test of your tap water. Environment Agency record · River health across England

GU33 in short

Tap water in GU33 (East Hampshire) is supplied by Southern Water in the East Hampshire 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 17 March 2026.

  • The cleanest tap water of the 7 areas tested in East HampshireGU33 scores 9.3 out of 10, ahead of GU26 in second place on 9.2.
  • Scores higher than all 6 neighbouring districtsThe nearest rival is GU30 on 9.2, against 9.3 here. Compare with GU30
  • Nothing tested came within 40% of its legal limitThe highest was Nitrate at 37% of the 50 mg/L maximum. See every reading

Next door

GU309.2 out of 10 · 154 mg/LPO88.8 out of 10GU269.2 out of 10 · 88 mg/LGU329.0 out of 10 · 154 mg/LGU347.0 out of 10 · 154 mg/LGU358.0 out of 10 · 154 mg/L

Questions about GU33 water

Is GU33 tap water safe to drink?

Based on the latest tests, GU33 (East Hampshire) 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 GU33 water?

We tested 22 contaminants in GU33 water. None exceeded recommended safe levels.

Who supplies water in GU33?

GU33 (East Hampshire) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.

Is GU33 water hard or soft?

No hardness reading has been published for GU33 itself. Across the GU postcode area the typical value is 154 mg/L CaCO3, which is classified as moderately hard. This is a moderate hardness level.

Should I use a water filter in GU33?

GU33 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 GU33 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for GU33, 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 GU33?

The Environment Agency rated the Western Rother (Upstream Petersfield) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by phosphate. 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. Its ecological rating has improved since the previous assessment. This is a rating of the river, not of tap water in GU33, 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 GU33

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
pH7.87 pHNone
Temperature11.1 °CNone
Conductivity375 µS/cmNone
Nitrate2.5 mg/L50 mg/L
Nitrite0.0055 mg/L0.5 mg/L
Phosphate0.056 mg/LNone
Dissolved Oxygen10.3 mg/LNone
Ammonia0.037 mg/L0.5 mg/L

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We'll email you when water quality data changes for GU33.

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