Water quality, hardness and compliance in South East England
According to TapWater.uk's analysis, South East Water scores 9.3/10 for drinking water quality across 1 monitored postcode districts in 2026. The company reports 99.93% compliance with UK drinking water standards.
Scores sorted by lowest first — worst quality at the top.
| Postcode | Area | Score | Status |
|---|---|---|---|
| BN3 | Brighton and Hove | 9.3/10 | Excellent |
Reported compliance with UK drinking water standards.
99.93%
Compliance above 99.9% is the norm across the UK industry, which is why a compliance figure alone says little about how your water actually tastes, scales, or reads locally. The per-district scores and flagged contaminants above are where South East Water's supply differs from the national picture.
All postcode districts within South East Water's supply network.
Yes. Across 1 monitored postcode districts, South East Water's average water quality score is 9.3/10. The lowest-scoring district we monitor is BN3 (9.3/10) and the highest is BN3 (9.3/10).
Hardness readings for South East Water's districts are still being collected. Enter your postcode on our hardness checker for the reading in your area.
South East Water reported a 99.93% compliance rate against UK drinking water standards. Compliance above 99.9% is the industry norm, which is exactly why we also publish per-district environmental scores and flagged contaminant counts: legal compliance and local water character are different questions.
South East Water supplies 2.2 million customers across South East England. The postcode districts we monitor in its area: BN3.
Active incidents affecting South East Water appear at the top of this page as soon as our monitoring picks them up, alongside the affected postcodes. For supply emergencies always check South East Water's own website, which carries the operational updates.