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tapwater
England and Wales average 9.0

Tap water in BN13, WorthingSafe to drink.

Supplied by Southern Water. 22,553 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 BN13 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 74% of it. 19 of 21 substances used under a quarter of theirs.

0%25%50%75%limitLegal limitChromium: 0.00019 mg/L, <1% of the 0.05 mg/L limitChromium<1%Cadmium: 0.000031 mg/L, <1% of the 0.005 mg/L limitCadmium<1%Antimony: 0.000042 mg/L, <1% of the 0.005 mg/L limitAntimony<1%Bromate: 0.00013 mg/L, 1% of the 0.01 mg/L limitBromate1%Selenium: 0.00052 mg/L, 1% of the 0.04 mg/L limitSelenium1%Boron: 0.0159 mg/L, 2% of the 1 mg/L limitBoron2%Lead: 0.00016 mg/L, 2% of the 0.01 mg/L limitLead2%Nitrite: 0.009 mg/L, 2% of the 0.5 mg/L limitNitrite2%Arsenic: 0.00022 mg/L, 2% of the 0.01 mg/L limitArsenic2%Turbidity: 0.13 NTU, 3% of the 4 NTU limitTurbidity3%Manganese: 0.00178 mg/L, 4% of the 0.05 mg/L limitManganese4%Fluoride: 0.06 mg/L, 4% of the 1.5 mg/L limitFluoride4%Mercury: 0.00004 mg/L, 4% of the 0.001 mg/L limitMercury4%Iron: 0.00928 mg/L, 5% of the 0.2 mg/L limitIron5%Aluminium: 0.0113 mg/L, 6% of the 0.2 mg/L limitAluminium6%Trihalomethanes: 0.0074 mg/L, 7% of the 0.1 mg/L limitTrihalomethanes7%Ammonia: 0.039 mg/L, 8% of the 0.5 mg/L limitAmmonia8%Copper: 0.212 mg/L, 11% of the 2 mg/L limitCopper11%Colour: 3 mg/L Pt/Co, 15% of the 20 mg/L Pt/Co limitColour15%Nickel: 0.00572 mg/L, 29% of the 0.02 mg/L limitNickel29%Nitrate: 36.9 mg/L, 74% of the 50 mg/L limitNitrate74%
  1. Nitrate74%
  2. Nickel29%
  3. Colour15%
  4. Copper11%
  5. Ammonia8%
  6. Trihalomethanes7%
  7. Aluminium6%
  8. Iron5%
  9. Fluoride4%
  10. Mercury4%
  11. Manganese4%
  12. Turbidity3%
  13. Arsenic2%
  14. Nitrite2%
  15. Lead2%
  16. Boron2%
  17. Bromate1%
  18. Selenium1%
  19. Antimony<1%
  20. Cadmium<1%
  21. Chromium<1%
  • pH 7.4 pH
  • Coliform Bacteria none found
  • E. coli none found
  • Conductivity 570 µS/cm
All 25 results as a table
SubstanceResultLegal limitShare of limit
Colour3 mg/L Pt/Co20 mg/L Pt/Co
15%
Turbidity0.13 NTU4 NTU
3%
pH7.4 pHNo legal limit–
Nitrate36.9 mg/L50 mg/L
74%
Lead0.00016 mg/L0.01 mg/L
2%
Coliform Bacteria0 count/100mlMust be zeroNone found
E. coli0 count/100mlMust be zeroNone found
Conductivity570 µS/cmNo legal limit–
Trihalomethanes0.0074 mg/L0.1 mg/L
7%
Aluminium0.0113 mg/L0.2 mg/L
6%
Iron0.00928 mg/L0.2 mg/L
5%
Manganese0.00178 mg/L0.05 mg/L
4%
Bromate0.00013 mg/L0.01 mg/L
1%
Ammonia0.039 mg/L0.5 mg/L
8%
Copper0.212 mg/L2 mg/L
11%
Nitrite0.009 mg/L0.5 mg/L
2%
Arsenic0.00022 mg/L0.01 mg/L
2%
Cadmium0.000031 mg/L0.005 mg/L
<1%
Chromium0.00019 mg/L0.05 mg/L
<1%
Nickel0.00572 mg/L0.02 mg/L
29%
Antimony0.000042 mg/L0.005 mg/L
<1%
Selenium0.00052 mg/L0.04 mg/L
1%
Fluoride0.06 mg/L1.5 mg/L
4%
Mercury0.00004 mg/L0.001 mg/L
4%
Boron0.0159 mg/L1 mg/L
2%
Outside your tap

Your river is the Ferring Rife, rated good

The Environment Agency rated the Ferring Rife as good for ecological health in its 2025 assessment, meaning the river 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. Its ecological rating has improved since the previous assessment.

None of this is a test of your tap water. Environment Agency record · River health across England

BN13 in short

Tap water in BN13 (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.

  • Nitrate is the reading closest to its limit, at 74% of the 50 mg/L maximumIt passed with room to spare, and everything else tested sat further below its limit. See every reading
  • 3rd cleanest of 4 areas tested in Worthing1 area in Worthing scored lower. The best is BN11 on 9.3.
  • 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 10BN129.3 out of 10BN119.3 out of 10

Questions about BN13 water

Is BN13 tap water safe to drink?

Based on the latest tests, BN13 (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 BN13 water?

We tested 25 contaminants in BN13 water. None exceeded recommended safe levels.

Who supplies water in BN13?

BN13 (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 BN13?

BN13 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 BN13 water?

No PFAS (forever chemicals) result is attached to the tap-water tests for BN13, 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 BN13?

The Environment Agency rated the Ferring Rife as good for ecological health in its 2025 assessment, meaning the river 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. Its ecological rating has improved since the previous assessment. This is a rating of the river, not of tap water in BN13, 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 BN13

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
pH7.53 pHNone
Temperature13 °CNone
Conductivity768 µS/cmNone
Ammonia0.07 mg/L0.5 mg/L
Nitrate8.5 mg/L50 mg/L
Nitrite0.035 mg/L0.5 mg/L
Phosphate0.043 mg/LNone
Dissolved Oxygen9.96 mg/LNone
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