Tap water in BN44, HorshamSafe to drink.
Supplied by Southern Water. 11,605 samples, 22 substances, latest on 30 April 2026. Everything is inside the legal limit, and nothing comes close to it.
9.4 / 10
The tank is as full as the score.
What to do about it
ZeroWater 12-Cup Ready-Pour
£40typical price
Households concerned about PFAS and heavy metals
Waterdrop 10UA Under Sink
£70typical price
High-volume under-sink filtration without RO complexity
BRITA Marella XL + MAXTRA PRO
£25typical price
Basic chlorine and taste improvement on a budget
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What's in a glass of BN44 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 61% of it. 17 of 18 substances used under a quarter of theirs.
- Nitrate61%
- Trihalomethanes16%
- Colour15%
- Bromate8%
- Aluminium6%
- Ammonia5%
- Iron5%
- Manganese4%
- Nickel3%
- Turbidity3%
- Nitrite2%
- Copper1%
- Arsenic1%
- Selenium1%
- Lead<1%
- Antimony<1%
- Cadmium<1%
- Chromium<1%
- pH 7.6 pH
- Coliform Bacteria none found
- E. coli none found
- Conductivity 498 µS/cm
All 22 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Colour | 3 mg/L Pt/Co | 20 mg/L Pt/Co | 15% |
| Turbidity | 0.13 NTU | 4 NTU | 3% |
| pH | 7.6 pH | No legal limit | – |
| Nitrate | 30.3 mg/L | 50 mg/L | 61% |
| Ammonia | 0.025 mg/L | 0.5 mg/L | 5% |
| Aluminium | 0.0113 mg/L | 0.2 mg/L | 6% |
| Iron | 0.00928 mg/L | 0.2 mg/L | 5% |
| Manganese | 0.00178 mg/L | 0.05 mg/L | 4% |
| Copper | 0.0278 mg/L | 2 mg/L | 1% |
| Lead | 0.00009 mg/L | 0.01 mg/L | <1% |
| Coliform Bacteria | 0 count/100ml | Must be zero | None found |
| E. coli | 0 count/100ml | Must be zero | None found |
| Conductivity | 498 µS/cm | No legal limit | – |
| Trihalomethanes | 0.0156 mg/L | 0.1 mg/L | 16% |
| Bromate | 0.0008 mg/L | 0.01 mg/L | 8% |
| Nitrite | 0.009 mg/L | 0.5 mg/L | 2% |
| Arsenic | 0.00012 mg/L | 0.01 mg/L | 1% |
| Cadmium | 0.000031 mg/L | 0.005 mg/L | <1% |
| Chromium | 0.00031 mg/L | 0.05 mg/L | <1% |
| Nickel | 0.00066 mg/L | 0.02 mg/L | 3% |
| Antimony | 0.000036 mg/L | 0.005 mg/L | <1% |
| Selenium | 0.00043 mg/L | 0.04 mg/L | 1% |
Your river is the Black Sewer, rated moderate
The Environment Agency rated the Black Sewer as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae. 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
BN44 in short
Tap water in BN44 (Horsham) is supplied by Southern Water in the Horsham Central zone and scores 9.4 out of 10, against an England and Wales average of 9.0. None of the 22 tested substances came close to a limit. The latest sample is from 30 April 2026.
- The cleanest tap water of the 5 areas tested in HorshamBN44 scores 9.4 out of 10, ahead of BN5 in second place on 9.3.
- Nitrate is the reading closest to its limit, at 61% 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 all 4 neighbouring districtsThe nearest rival is BN5 on 9.3, against 9.4 here. Compare with BN5
Questions about BN44 water
Is BN44 tap water safe to drink?
Based on the latest tests, BN44 (Horsham) water scores 9.4/10, which is safe. 0 of 22 tested contaminants exceeded recommended levels. Water is supplied by Southern Water.
What contaminants are in BN44 water?
We tested 22 contaminants in BN44 water. None exceeded recommended safe levels.
Who supplies water in BN44?
BN44 (Horsham) 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 BN44?
BN44 water scored 9.4/10 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 BN44 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for BN44, 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 BN44?
The Environment Agency rated the Black Sewer as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by water plants and algae. 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 BN44, which is treated before it reaches homes.
Keep reading
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
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- How to Test Your Tap WaterFrom DIY strips to professional lab analysis
- Best Water Filter Jug UKBRITA vs ZeroWater vs the rest, tested against real data
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River and groundwater readings near BN44
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.
Get alerts for your area
We'll email you when water quality data changes for BN44.