Is it spilling into your river right now?
England’s water companies publish live storm-overflow monitoring, and almost nobody sees it. Trupin puts every monitored overflow on one free map — discharging, not discharging, or offline — next to the bathing waters, riverside paths and parks it actually affects.
What a pin tells you
Each pin is one monitored storm overflow, in one of three states. Tap a pin to see which, or use the filter chips at the top of the map to show only one state at a time.
Discharging
The overflow is spilling now. The pin carries the time the water company’s own monitor started reporting it.
Not discharging
The monitor is reporting and the overflow is not spilling. Most pins sit here most of the time — which is what makes the exceptions worth seeing.
Monitor offline
The monitor is not reporting at all, so nobody can say whether that overflow is spilling. Trupin shows these rather than hiding them.
An offline monitor is not a clean river
A spill nobody measured is not a spill that didn’t happen. Where a monitor stops reporting, the public record simply goes quiet — and the overflow disappears from every count built on it. Trupin keeps those overflows on the map as their own state, so the gap in the data is visible instead of invisible.
Trupin reads the water companies’ own live monitoring rather than an end-of-year summary, so the map moves with what they publish.
Start where you live
Trupin is anchored on Richmond upon Thames, where the river runs through the middle of the borough. The local view covers the monitored outfalls on the Thames itself and on the Brent, Beverley Brook and the Hogsmill. When the answer there is “none of them, right now”, that is still an answer you currently have no way to get. Pan out and the same layer covers monitored overflows across England.
Where this data comes from
Storm-overflow activity is published by the water companies themselves and used here under their open licences. Full rights basis and attribution for every Trupin layer is on the sources page.