Skip to main content
tapwater
England and Wales average 9.0

Tap water in GU11, RushmoorToo few tap tests to call it.Slightly hard.

Supplied by Southern Water. 15 substances, latest on 8 October 2026. These are river and groundwater samples near GU11, not tests of treated tap water, so treat the score as a rough guide.

See the filter we recommendSee everything that was tested

9.0 / 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

ZeroWater 12-Cup Ready-Pour

£40typical price

Households concerned about PFAS and heavy metals

Check price at Amazon (opens in new tab)
Waterdrop 10UA Under Sink

Waterdrop 10UA Under Sink

£70typical price

High-volume under-sink filtration without RO complexity

Check price at Waterdrop (opens in new tab)
BRITA Marella XL + MAXTRA PRO

BRITA Marella XL + MAXTRA PRO

£25typical price

Basic chlorine and taste improvement on a budget

Check price at Amazon (opens in new tab)

We earn a commission if you buy through these links, at no extra cost to you. It never changes which product we put first. How we make money

What's in a glass of GU11 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.

Iron came closest to a limit, at 65% of it. 7 of 8 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.00008 mg/L, <1% of the 2 mg/L limitCopper<1%Chromium: 0.00019 mg/L, <1% of the 0.05 mg/L limitChromium<1%Nitrate: 0.49 mg/L, <1% of the 50 mg/L limitNitrate<1%Nitrite: 0.011 mg/L, 2% of the 0.5 mg/L limitNitrite2%Lead: 0.000436 mg/L, 4% of the 0.01 mg/L limitLead4%Ammonia: 0.067 mg/L, 13% of the 0.5 mg/L limitAmmonia13%Nickel: 0.0037 mg/L, 19% of the 0.02 mg/L limitNickel19%Iron: 0.13 mg/L, 65% of the 0.2 mg/L limitIron65%
  1. Iron65%
  2. Nickel19%
  3. Ammonia13%
  4. Lead4%
  5. Nitrite2%
  6. Nitrate<1%
  7. Chromium<1%
  8. Copper<1%
  • pH 7.71 pH
  • Temperature 11.1 °C
  • Conductivity 428 µS/cm
  • Phosphate 0.13 mg/L
  • Dissolved Oxygen 7.83 mg/L
  • Zinc 0.013 mg/L
All 15 results as a table
SubstanceResultLegal limitShare of limit
pH7.71 pHNo legal limit–
Temperature11.1 °CNo legal limit–
Conductivity428 µS/cmNo legal limit–
Ammonia0.067 mg/L0.5 mg/L
13%
Nitrate0.49 mg/L50 mg/L
<1%
Nitrite0.011 mg/L0.5 mg/L
2%
Phosphate0.13 mg/LNo legal limit–
Dissolved Oxygen7.83 mg/LNo legal limit–
Hardness (as CaCO3)221 mg/LNo legal limit–
Zinc0.013 mg/LNo legal limit–
Nickel0.0037 mg/L0.02 mg/L
19%
Copper0.00008 mg/L2 mg/L
<1%
Iron0.13 mg/L0.2 mg/L
65%
Chromium0.00019 mg/L0.05 mg/L
<1%
Lead0.000436 mg/L0.01 mg/L
4%

154mg of limescale minerals in every litre, typical for the GU area. GU11 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 Blackwater (Aldershot to Cove Brook confluence at Hawley), rated moderate

The Environment Agency rated the Blackwater (Aldershot to Cove Brook confluence at Hawley) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by dissolved oxygen, phosphate and insects and other small river life. 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

GU11 in short

Tap water in GU11 (Rushmoor) is supplied by Southern Water in the Rushmoor Central zone and scores 9.0 out of 10, against an England and Wales average of 9.0. None of the 15 tested substances came close to a limit. The latest sample is from 8 October 2026.

  • Iron is the reading closest to its limit, at 65% of the 0.2 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • Moderately hard water at 154 mg/LSome scale over time across the GU postcode area, but not enough to justify a softener for most homes. How hardness is measured
  • Scores higher than 2 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

GU148.2 out of 10 · 154 mg/LGU98.8 out of 10 · 204 mg/LGU129.4 out of 10 · 154 mg/L

Questions about GU11 water

Is GU11 tap water safe to drink?

Based on the latest tests, GU11 (Rushmoor) water scores 9/10, which is safe. 0 of 15 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.

What contaminants are in GU11 water?

We tested 15 contaminants in GU11 water. None exceeded recommended safe levels.

Who supplies water in GU11?

GU11 (Rushmoor) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.

Is GU11 water hard or soft?

No hardness reading has been published for GU11 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 GU11?

GU11 water scored 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 GU11 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for GU11, 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 GU11?

The Environment Agency rated the Blackwater (Aldershot to Cove Brook confluence at Hawley) as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by dissolved oxygen, phosphate and insects and other small river life. 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 GU11, 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

Get alerts for your area

We'll email you when water quality data changes for GU11.