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tapwater
England and Wales average 9.0

Tap water in TR13, CornwallSafe to drink.

Supplied by South West Water. 874 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

9.5 / 10

The tank is as full as the score.

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What's in a glass of TR13 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 20% of it. 15 of 15 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.00773 mg/L, <1% of the 2 mg/L limitCopper<1%Lead: 0.0001 mg/L, 1% of the 0.01 mg/L limitLead1%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: 0.000919 mg/L, 2% of the 0.05 mg/L limitManganese2%Antimony: 0.0001 mg/L, 2% of the 0.005 mg/L limitAntimony2%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%Arsenic: 0.00062 mg/L, 6% of the 0.01 mg/L limitArsenic6%Colour: 2 mg/L Pt/Co, 10% of the 20 mg/L Pt/Co limitColour10%Aluminium: 0.0257 mg/L, 13% of the 0.2 mg/L limitAluminium13%Nickel: 0.0033 mg/L, 17% of the 0.02 mg/L limitNickel17%Nitrate: 9.8 mg/L, 20% of the 50 mg/L limitNitrate20%
  1. Nitrate20%
  2. Nickel17%
  3. Aluminium13%
  4. Colour10%
  5. Arsenic6%
  6. Iron4%
  7. Turbidity3%
  8. Selenium3%
  9. Antimony2%
  10. Manganese2%
  11. Chromium2%
  12. Bromate1%
  13. Cadmium1%
  14. Lead1%
  15. Copper<1%
  • pH 7.6 pH
All 16 results as a table
SubstanceResultLegal limitShare of limit
Copper0.00773 mg/L2 mg/L
<1%
Lead0.0001 mg/L0.01 mg/L
1%
Nickel0.0033 mg/L0.02 mg/L
17%
Aluminium0.0257 mg/L0.2 mg/L
13%
Colour2 mg/L Pt/Co20 mg/L Pt/Co
10%
Iron0.0076 mg/L0.2 mg/L
4%
Manganese0.000919 mg/L0.05 mg/L
2%
pH7.6 pHNo legal limit–
Turbidity0.13 NTU4 NTU
3%
Bromate0.000132 mg/L0.01 mg/L
1%
Antimony0.0001 mg/L0.005 mg/L
2%
Arsenic0.00062 mg/L0.01 mg/L
6%
Cadmium0.00006 mg/L0.005 mg/L
1%
Chromium0.0008 mg/L0.05 mg/L
2%
Nitrate9.8 mg/L50 mg/L
20%
Selenium0.0012 mg/L0.04 mg/L
3%
Outside your tap

Your river is the Lower River Cober, rated moderate

The Environment Agency rated the Lower River Cober as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. 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

TR13 in short

Tap water in TR13 (Cornwall) is supplied by South West Water in the Cornwall Central zone and scores 9.5 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.

  • 19th cleanest of 45 areas tested in CornwallSquarely mid-table for Cornwall, between EX23 on 9.5 and TR1 on 8.3.
  • Nothing tested came within 40% of its legal limitThe highest was Nitrate at 20% of the 50 mg/L maximum. See every reading
  • Scores higher than 1 of 10 neighbouring districtsWater here is typical for the immediate area, which usually means the same treatment works and the same supply zone.

Next door

EX239.5 out of 10 · 48 mg/LPL109.5 out of 10 · 26 mg/LPL119.5 out of 10 · 26 mg/LPL129.5 out of 10 · 26 mg/LPL139.5 out of 10 · 38 mg/LPL149.5 out of 10 · 38 mg/LPL159.5 out of 10 · 42 mg/LPL179.5 out of 10 · 26 mg/LPL329.4 out of 10 · 22 mg/LPL309.5 out of 10 · 34 mg/L

Questions about TR13 water

Is TR13 tap water safe to drink?

Based on the latest tests, TR13 (Cornwall) water scores 9.5/10, which is safe. 0 of 16 tested contaminants exceeded recommended levels. Water is supplied by South West Water.

What contaminants are in TR13 water?

We tested 16 contaminants in TR13 water. None exceeded recommended safe levels.

Who supplies water in TR13?

TR13 (Cornwall) 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 TR13?

TR13 water scored 9.5/10 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 TR13 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for TR13, 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 TR13?

The Environment Agency rated the Lower River Cober as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. 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 TR13, 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 TR13

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
Ammonia0.512 mg/L0.5 mg/L
Dissolved Oxygen10.6 mg/LNone
Nitrate14 mg/L50 mg/L
Nitrite0.0076 mg/L0.5 mg/L
Phosphate0.066 mg/LNone

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We'll email you when water quality data changes for TR13.

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