Storm Overflow Monitor

Near real-time storm overflow discharge data across England's rivers, coastline and waterways. Data sourced from water company EDM sensors via the National Storm Overflow Hub.

Active Now

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Coastal Today

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Near Bathing Water Today

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Discharges Today

14,242

Sites Monitored

Near bathing water only

Active Ended <24h Excellent Good Sufficient Poor Updating…

Recent Activity

Live

Storm overflow discharges in the last 24 hours

Nearby Discharges

Locating your position…

Finding discharges near your location…

Company Performance

Annual spill data (EA EDM returns) · —

Highest spill hours

#	Company	Hours

Lowest spill hours

#	Company	Hours

Trends & Analysis

Spill hours (bars) and spill count (line) · all companies · 2025 EA EDM returns

Data note: This page shows storm overflow discharge activity as indicated by Event Duration Monitors (EDMs). Monitor activity indicates a potential discharge — it does not confirm water quality or pollution levels. For bathing water safety, refer to GOV.UK Bathing Water Quality. Source: Stream Water Data / Water UK National Storm Overflow Hub.

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