Tap water in GU52, HartToo few tap tests to call it.Slightly hard.
Supplied by Southern Water. 8 substances, latest on 19 October 2026. These are river and groundwater samples near GU52, not tests of treated tap water, so treat the score as a rough guide.
8.9 / 10
The tank is as full as the score. The specks are the minerals that make water hard.
What to do about it
ZeroWater 12-Cup Ready-Pour
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Households concerned about PFAS and heavy metals
Waterdrop 10UA Under Sink
£70typical price
High-volume under-sink filtration without RO complexity
BRITA Marella XL + MAXTRA PRO
£25typical price
Basic chlorine and taste improvement on a budget
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What's in a glass of GU52 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.
Ammonia came closest to a limit, at 30% of it. 2 of 3 substances used under a quarter of theirs.
- Ammonia30%
- Nitrite3%
- Nitrate<1%
- pH 6.31 pH
- Temperature 10.3 °C
- Conductivity 372 µS/cm
- Phosphate 0.031 mg/L
- Dissolved Oxygen 5.51 mg/L
All 8 results as a table
154mg of limescale minerals in every litre, typical for the GU area. GU52 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 Hart (Crondall to Elvetham), rated poor
The Environment Agency rated the Hart (Crondall to Elvetham) as poor for ecological health in its 2025 assessment, meaning the river is badly affected, with much of the expected wildlife missing. It is held back by fish. 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
40
forever-chemical detections in nearby rivers and groundwater
At 1 site. The highest was PFPeA at 0.0061 µg/L, at Hart at Lea Bridge, Hazeley, 9.9 km away, in October 2023. These are river and borehole samples, not tests of your tap water.
Every PFAS sample around Reading · Which filters remove PFAS · PFAS explained
GU52 in short
Tap water in GU52 (Hart) is supplied by Southern Water in the Hart Central zone and scores 8.9 out of 10, against an England and Wales average of 9.0. None of the 8 tested substances came close to a limit. The latest sample is from 19 October 2026.
- 2nd cleanest of 6 areas tested in HartOnly 1 area in Hart scored higher. The best is RG29 on 9.4.
- PFAS found at 1 monitoring site within 10 kmThose are river and groundwater samples, not tap water. The highest was PFPeA about 9.9 km away. What was measured
- Nothing tested came within 40% of its legal limitThe highest was Ammonia at 30% of the 0.5 mg/L maximum. See every reading
Questions about GU52 water
Is GU52 tap water safe to drink?
Based on the latest tests, GU52 (Hart) water scores 8.9/10, which is safe. 0 of 8 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.
What contaminants are in GU52 water?
We tested 8 contaminants in GU52 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 GU52?
GU52 (Hart) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.
Is GU52 water hard or soft?
No hardness reading has been published for GU52 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 GU52?
GU52 water scored 8.9/10 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 GU52 water?
The tap-water tests we hold for GU52 do not include a PFAS result. Environment Agency monitoring found PFAS in 40 river and groundwater samples from 1 sites within 10 km of GU52, the highest being PFPeA at 0.0061 µg/L about 9.9 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 GU52?
The Environment Agency rated the Hart (Crondall to Elvetham) as poor for ecological health in its 2025 assessment, meaning the river is badly affected, with much of the expected wildlife missing. It is held back by fish. 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 GU52, which is treated before it reaches homes.
Keep reading
- Best Filter for PFAS RemovalThe filters with independent certification to remove forever chemicals
- PFAS Forever ChemicalsWhat PFAS are and how to reduce your exposure at home
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
- Best Water Filters UKEvery filter type compared on what it actually removes
PFAS explainedHow to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
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