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tapwater
England and Wales average 9.0

Tap water in TR24, Isles of ScillySafe to drink.

Supplied by South West Water. 591 samples, 16 substances, latest on 10 December 2025. 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.

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What's in a glass of TR24 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 19% of it. 15 of 15 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.0177 mg/L, <1% of the 2 mg/L limitCopper<1%Cadmium: 0.00006 mg/L, 1% of the 0.005 mg/L limitCadmium1%Bromate: 0.000132 mg/L, 1% of the 0.01 mg/L limitBromate1%Chromium: 0.0008 mg/L, 2% of the 0.05 mg/L limitChromium2%Manganese: 0.00127 mg/L, 3% of the 0.05 mg/L limitManganese3%Selenium: 0.0012 mg/L, 3% of the 0.04 mg/L limitSelenium3%Turbidity: 0.13 NTU, 3% of the 4 NTU limitTurbidity3%Iron: 0.0076 mg/L, 4% of the 0.2 mg/L limitIron4%Antimony: 0.0002 mg/L, 4% of the 0.005 mg/L limitAntimony4%Lead: 0.000588 mg/L, 6% of the 0.01 mg/L limitLead6%Arsenic: 0.0012 mg/L, 12% of the 0.01 mg/L limitArsenic12%Aluminium: 0.0257 mg/L, 13% of the 0.2 mg/L limitAluminium13%Colour: 2.6 mg/L Pt/Co, 13% of the 20 mg/L Pt/Co limitColour13%Nickel: 0.0033 mg/L, 17% of the 0.02 mg/L limitNickel17%Nitrate: 9.7 mg/L, 19% of the 50 mg/L limitNitrate19%
  1. Nitrate19%
  2. Nickel17%
  3. Colour13%
  4. Aluminium13%
  5. Arsenic12%
  6. Lead6%
  7. Antimony4%
  8. Iron4%
  9. Turbidity3%
  10. Selenium3%
  11. Manganese3%
  12. Chromium2%
  13. Bromate1%
  14. Cadmium1%
  15. Copper<1%
  • pH 7.2 pH
All 16 results as a table
SubstanceResultLegal limitShare of limit
Aluminium0.0257 mg/L0.2 mg/L
13%
Antimony0.0002 mg/L0.005 mg/L
4%
Arsenic0.0012 mg/L0.01 mg/L
12%
Bromate0.000132 mg/L0.01 mg/L
1%
Cadmium0.00006 mg/L0.005 mg/L
1%
Chromium0.0008 mg/L0.05 mg/L
2%
Colour2.6 mg/L Pt/Co20 mg/L Pt/Co
13%
Iron0.0076 mg/L0.2 mg/L
4%
Manganese0.00127 mg/L0.05 mg/L
3%
Nitrate9.7 mg/L50 mg/L
19%
pH7.2 pHNo legal limit–
Selenium0.0012 mg/L0.04 mg/L
3%
Turbidity0.13 NTU4 NTU
3%
Copper0.0177 mg/L2 mg/L
<1%
Lead0.000588 mg/L0.01 mg/L
6%
Nickel0.0033 mg/L0.02 mg/L
17%
Outside your tap

Your coastal water is the Scilly Isles, rated good

The Environment Agency rated the Scilly Isles as good for ecological health in its 2025 assessment, meaning the coastal water is only slightly changed from its natural state. 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

TR24 in short

Tap water in TR24 (Isles of Scilly) is supplied by South West Water in the Isles of Scilly Central zone and scores 9.3 out of 10, against an England and Wales average of 9.0. None of the 16 tested substances came close to a limit. The latest sample is from 10 December 2025.

  • 4th cleanest of 5 areas tested in Isles of Scilly1 area in Isles of Scilly scored lower. The best is TR21 on 9.3.
  • Nothing tested came within 40% of its legal limitThe highest was Nitrate at 19% of the 50 mg/L maximum. See every reading
  • Scores higher than 0 of 4 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

TR259.3 out of 10TR219.3 out of 10TR229.3 out of 10TR239.3 out of 10

Questions about TR24 water

Is TR24 tap water safe to drink?

Based on the latest tests, TR24 (Isles of Scilly) water scores 9.3/10, which is safe. 0 of 16 tested contaminants exceeded recommended levels. Water is supplied by South West Water.

What contaminants are in TR24 water?

We tested 16 contaminants in TR24 water. None exceeded recommended safe levels.

Who supplies water in TR24?

TR24 (Isles of Scilly) is supplied by South West Water. You can view their full profile and compliance data on our supplier page.

Should I use a water filter in TR24?

TR24 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 TR24 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for TR24, 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 coastal water near TR24?

The Environment Agency rated the Scilly Isles as good for ecological health in its 2025 assessment, meaning the coastal water is only slightly changed from its natural state. 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 coastal water, not of tap water in TR24, 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 TR24

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
Lead0.0132 mg/L0.01 mg/L
Ammonia0.449 mg/L0.5 mg/L
Arsenic0.134 mg/L0.01 mg/L
Manganese0.431 mg/L0.05 mg/L
pH6.18 pHNone
Chromium0.0015 mg/L0.05 mg/L
Copper0.0087 mg/L2 mg/L
Boron0.219 mg/L1 mg/L

Get alerts for your area

We'll email you when water quality data changes for TR24.

Source: South West 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