England · Environment Agency
Hornsea
Avoid swimming
Yorkshire Water reports HORNSEA/CSO is currently discharging and the operator's own published linkage names this bathing water as affected.
High confidence — the operator itself reports an active discharge affecting this water.
Status computed 22 Aug 2026, 04:43 UTC; statuses refresh every 15 minutes.
What we know
- Regulator classification
- Excellent
- Pollution risk forecast
- Normal
- Active discharges
- 2 within 5km right now
- Recent discharges (last 48 hours)
- 16 within 5km
- Upstream river network
- Downstream of a Yorkshire Water discharge in the last 48 hours
- Operator-published linkage
- Yorkshire Water names this bathing water as affected by HORNSEA/CSO — discharging right now
- Surrounding overflow coverage
- Within an ingested water company network
- Monitoring season
- Currently in regulator monitoring season
Last sampled 10 August 2026 · 6 weeks ago. Source: Environment Agency.
Forecast expired 22 Aug 2026, 08:29 UTC. Source: Environment Agency.
HORNSEA/CSO (Yorkshire Water) — started 21 Aug 2026, 11:30 UTC.
Most recent at HORNSEA/CSO (Yorkshire Water) — ended 21 Aug 2026, 13:52 UTC.
Sewage-map data as of 22 Aug 2026, 04:30 UTC — discharges traced through the river network.
The operator’s own published hydrological assessment — a stronger attribution than distance alone.
Water body baseline
The Environment Agency classifies this water body (Yorkshire South) as Moderate ecological status (2022 classification). That is a Water Framework Directive assessment of long-term ecosystem health — plants, invertebrates, fish, chemistry — not a bacteriological measure of whether the water is safe to swim in today. It is shown as context and plays no part in the verdict above.
The EA’s Catchment Data Explorer page for this water body →
Source: EA Catchment Data Explorer, Open Government Licence v3.0 — data as of 21 Aug 2026, 10:40 UTC.
What this verdict means
Avoid swimming is driven by the strongest negative signals this map tracks: an active sewage discharge affecting this water, or a regulator classification of Poor or a closure. After a discharge ends, waiting at least 48 hours before swimming is the standard advice.
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.