England · Environment Agency
The Serpentine - Hyde Park
Use caution
Sewage discharge in the last 48h from Victoria CSO (8 recent events within 5km, Thames Water).
High confidence — a discharge in the last 48 hours is the driving signal.
Status computed 7 Nov 2026, 00:58 UTC; statuses refresh every 15 minutes.
What we know
- Regulator classification
- Good
- Pollution risk forecast
- Normal (forecast expired)
- Active discharges
- None within 5km
- Recent discharges (last 48 hours)
- 8 within 5km
- Upstream river network
- None reported affecting this spot’s river reaches
- Surrounding overflow coverage
- Within an ingested water company network
- Monitoring season
- Currently in regulator monitoring season
Last sampled 15 September 2026 · 8 weeks ago. Source: Environment Agency.
Forecast expired 2 Oct 2026, 08:29 UTC — outside its 24-hour validity window. Source: Environment Agency.
Most recent at Victoria CSO (Thames Water) — ended 5 Nov 2026, 14:34 UTC.
Discharges traced through the river network by sewage-map.
Thames Water discharge data via Thames Water Utilities Limited’s first-party Open Data API, under its Open Data licence; and, in parallel during a verification phase, the thames-sewage mirror (Alex Lipp, CC-BY 4.0).
What this verdict means
Use caution means at least one signal argues against swimming right now — a discharge in the last 48 hours nearby or upstream, an elevated pollution risk forecast, or a weak classification. The evidence above shows which signal is driving it.
Every verdict here is computed from regulator classifications, sample dates, pollution-risk forecasts, and water-company discharge reports — it is not a water test. Absence of a negative signal is not positive confirmation of safety, and conditions on the day (rainfall, currents, cold) matter as much as water quality. Read how statuses are decided.