Receiving watercourse

Mersey Estuary

36 monitored storm overflows record Mersey Estuary as their receiving watercourse in the National Storm Overflow Hub. Operated by United Utilities.

This watercourse is part of our featured River Mersey coverage — that page aggregates the whole river, including tributaries and estuary stretches.

Storm overflows

Active right now

Monitors offline

243

Spill events · 12 months

32,665h

Recorded discharge · 12 months

Open discrepancies

Every monitored overflow· 36

Each links to its full record — spill history, nearby water-quality sampling, citizen reports, and pre-filled accountability letters.

Sewage debris, foam, dead fish — citizen sightings are cross-referenced against the official discharge data above and strengthen the public record.