Tap water in GU34, East HampshireNitrite is over the limit.Slightly hard.
Supplied by Southern Water. 21 samples, 9 substances, latest on 9 December 2022. Nitrite came in above the legal limit. Everything else passed.
7.0 / 10
The tank is as full as the score. The specks are the minerals that make water hard.
What to do about it
Waterdrop G3P600 Reverse Osmosis
£550typical price
Removes nitrate, the result that stood out in GU34.
Osmio PRO-III Ultimate Whole House
£499typical price
Removes nitrate, the result that stood out in GU34.
ZeroWater 12-Cup Ready-Pour
£40typical price
Removes nitrate, the result that stood out in GU34.
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What's in a glass of GU34 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 160% of it.
- Nitrite160%
- Nitrate80%
- Boron14%
- Iron7%
- Manganese5%
- Chromium5%
- Cadmium4%
- Aluminium4%
- Mercury4%
All 9 results as a table
154mg of limescale minerals in every litre, typical for the GU area. GU34 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.
Your river is the Caker Stream, rated bad
The Environment Agency rated the Caker Stream 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, water plants and algae and 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 dropped since the previous assessment.
None of this is a test of your tap water. Environment Agency record · River health across England
GU34 in short
Tap water in GU34 (East Hampshire) is supplied by Southern Water in the East Hampshire Central zone and scores 7.0 out of 10, against an England and Wales average of 9.0. 2 of 9 tested substances were close to or over a limit. The latest sample is from 9 December 2022.
- The newest sample here is from December 2022That is over 3 years old, so treat this page as a record of past results rather than today's tap water.
- Nitrite was measured at 0.8 mg/L, 60% over the UK limitIt is the furthest over its limit of the 2 substances flagged here. See the full results
- 5th cleanest of 7 areas tested in East Hampshire2 areas in East Hampshire scored lower. The best is GU33 on 9.3.
Questions about GU34 water
Is GU34 tap water safe to drink?
Based on the latest tests, GU34 (East Hampshire) water scores 7/10, which is safe. 2 of 9 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.
What contaminants are in GU34 water?
We tested 9 contaminants in GU34 water. 2 were flagged, including Nitrite, Nitrate.
Who supplies water in GU34?
GU34 (East Hampshire) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.
Is GU34 water hard or soft?
No hardness reading has been published for GU34 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 GU34?
With 2 contaminants above recommended levels in GU34, 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 GU34 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for GU34, 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 GU34?
The Environment Agency rated the Caker Stream 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, water plants and algae and 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 dropped since the previous assessment. This is a rating of the river, not of tap water in GU34, which is treated before it reaches homes.
Keep reading
- Best Water Filters UKEvery filter type compared on what it actually removes
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
- How to Test Your Tap WaterFrom DIY strips to professional lab analysis
- Best Water Filter Jug UKBRITA vs ZeroWater vs the rest, tested against real data
Nitrate levelsHow to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
River and groundwater readings near GU34
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.
| Substance | Reading | Drinking water limit |
|---|---|---|
| pH | 7.56 pH | None |
| Temperature | 14.1 °C | None |
| Conductivity | 666 µS/cm | None |
| Ammonia | 0.089 mg/L | 0.5 mg/L |
| Nitrate | 4.8 mg/L | 50 mg/L |
| Nitrite | 0.018 mg/L | 0.5 mg/L |
| Phosphate | 0.074 mg/L | None |
| Dissolved Oxygen | 8.3 mg/L | None |
| Hardness (as CaCO3) | 341 mg/L | None |
| Fluoride | 0.169 mg/L | 1.5 mg/L |
| Zinc | 0.00261 mg/L | None |
| Nickel | 0.00133 mg/L | 0.02 mg/L |
| Copper | 0.000996 mg/L | 2 mg/L |
Get alerts for your area
We'll email you when water quality data changes for GU34.