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tapwater
England and Wales average 9.0

Tap water in BN11, WorthingSafe to drink.

Supplied by Southern Water. 18,361 samples, 25 substances, latest on 30 April 2026. 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.

What to do about it

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What's in a glass of BN11 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 70% of it. 20 of 21 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitCopper: 0.0058 mg/L, <1% of the 2 mg/L limitCopper<1%Nitrite: 0.004 mg/L, <1% of the 0.5 mg/L limitNitrite<1%Lead: 0.00009 mg/L, <1% of the 0.01 mg/L limitLead<1%Selenium: 0.0005 mg/L, 1% of the 0.04 mg/L limitSelenium1%Bromate: 0.00016 mg/L, 2% of the 0.01 mg/L limitBromate2%Boron: 0.0178 mg/L, 2% of the 1 mg/L limitBoron2%Chromium: 0.001 mg/L, 2% of the 0.05 mg/L limitChromium2%Cadmium: 0.00012 mg/L, 2% of the 0.005 mg/L limitCadmium2%Turbidity: 0.13 NTU, 3% of the 4 NTU limitTurbidity3%Manganese: 0.00178 mg/L, 4% of the 0.05 mg/L limitManganese4%Mercury: 0.00004 mg/L, 4% of the 0.001 mg/L limitMercury4%Nickel: 0.0009 mg/L, 5% of the 0.02 mg/L limitNickel5%Iron: 0.00928 mg/L, 5% of the 0.2 mg/L limitIron5%Fluoride: 0.07 mg/L, 5% of the 1.5 mg/L limitFluoride5%Trihalomethanes: 0.00495 mg/L, 5% of the 0.1 mg/L limitTrihalomethanes5%Aluminium: 0.0113 mg/L, 6% of the 0.2 mg/L limitAluminium6%Antimony: 0.0003 mg/L, 6% of the 0.005 mg/L limitAntimony6%Ammonia: 0.039 mg/L, 8% of the 0.5 mg/L limitAmmonia8%Arsenic: 0.001 mg/L, 10% of the 0.01 mg/L limitArsenic10%Colour: 3 mg/L Pt/Co, 15% of the 20 mg/L Pt/Co limitColour15%Nitrate: 35.1 mg/L, 70% of the 50 mg/L limitNitrate70%
  1. Nitrate70%
  2. Colour15%
  3. Arsenic10%
  4. Ammonia8%
  5. Antimony6%
  6. Aluminium6%
  7. Trihalomethanes5%
  8. Fluoride5%
  9. Iron5%
  10. Nickel5%
  11. Mercury4%
  12. Manganese4%
  13. Turbidity3%
  14. Cadmium2%
  15. Chromium2%
  16. Boron2%
  17. Bromate2%
  18. Selenium1%
  19. Lead<1%
  20. Nitrite<1%
  21. Copper<1%
  • pH 8.1 pH
  • Coliform Bacteria none found
  • E. coli none found
  • Conductivity 541 µS/cm
All 25 results as a table
SubstanceResultLegal limitShare of limit
pH8.1 pHNo legal limit–
Nitrate35.1 mg/L50 mg/L
70%
Nitrite0.004 mg/L0.5 mg/L
<1%
Ammonia0.039 mg/L0.5 mg/L
8%
Aluminium0.0113 mg/L0.2 mg/L
6%
Iron0.00928 mg/L0.2 mg/L
5%
Manganese0.00178 mg/L0.05 mg/L
4%
Copper0.0058 mg/L2 mg/L
<1%
Arsenic0.001 mg/L0.01 mg/L
10%
Cadmium0.00012 mg/L0.005 mg/L
2%
Chromium0.001 mg/L0.05 mg/L
2%
Nickel0.0009 mg/L0.02 mg/L
5%
Lead0.00009 mg/L0.01 mg/L
<1%
Antimony0.0003 mg/L0.005 mg/L
6%
Selenium0.0005 mg/L0.04 mg/L
1%
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Conductivity541 µS/cmNo legal limit–
Trihalomethanes0.00495 mg/L0.1 mg/L
5%
Colour3 mg/L Pt/Co20 mg/L Pt/Co
15%
Turbidity0.13 NTU4 NTU
3%
Bromate0.00016 mg/L0.01 mg/L
2%
Boron0.0178 mg/L1 mg/L
2%
Fluoride0.07 mg/L1.5 mg/L
5%
Mercury0.00004 mg/L0.001 mg/L
4%
Outside your tap

Your river is the Teville Stream, rated bad

The Environment Agency rated the Teville 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, dissolved oxygen 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

BN11 in short

Tap water in BN11 (Worthing) is supplied by Southern Water in the Worthing Central zone and scores 9.3 out of 10, against an England and Wales average of 9.0. None of the 25 tested substances came close to a limit. The latest sample is from 30 April 2026.

  • The cleanest tap water of the 4 areas tested in WorthingBN11 scores 9.3 out of 10, ahead of BN12 in second place on 9.3.
  • Nitrate is the reading closest to its limit, at 70% of the 50 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • Scores higher than 1 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

BN149.0 out of 10BN139.3 out of 10BN129.3 out of 10

Questions about BN11 water

Is BN11 tap water safe to drink?

Based on the latest tests, BN11 (Worthing) water scores 9.3/10, which is safe. 0 of 25 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.

What contaminants are in BN11 water?

We tested 25 contaminants in BN11 water. None exceeded recommended safe levels.

Who supplies water in BN11?

BN11 (Worthing) is supplied by Southern Water. You can view their full profile and compliance data on our supplier page.

Should I use a water filter in BN11?

BN11 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 BN11 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for BN11, 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 BN11?

The Environment Agency rated the Teville 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, dissolved oxygen 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 BN11, 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 BN11

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
pH7.66 pHNone
Temperature18.1 °CNone
Conductivity318 µS/cmNone
Phosphate0.13 mg/LNone
Ammonia0.11 mg/L0.5 mg/L
Nitrate9.6 mg/L50 mg/L
Dissolved Oxygen9.4 mg/LNone
Nitrite0.0053 mg/L0.5 mg/L
Nickel0.0021 mg/L0.02 mg/L

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Source: Southern 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