Water company · Thames basin
Many monitors offline
Serves 15 million people across London and the Thames basin. Major rivers: Thames, Lee, Wey, Mole, Wandle.
Thames Water operates 577 monitored storm overflows. 35 monitors are offline. The data records a cumulative discharge of 14 weeks across this operator's network in the last 30 days across an estimated 280 events. The Truth Engine has 41 open flags for this operator's overflows right now.
577
Storm overflows
0
Active right now
35
Monitors offline
41
Open flags
70
Spills · last 7 days
14 weeks
Cumulative discharge · 30 days
3.2 h
Avg event length · 30 days
0
Spills · last 24 hours
1,806
spill events
4,641h
cumulative discharge
5 days
longest single event
2026-05-07
first event on record
Across 11 water companies in the EA dataset, Thames Water averaged 4.1h per monitored overflow in the last 30 days. The national median was 3.9h per overflow. ranked 7 of 11 of UK water companies by 30-day spill hours per monitored overflow.
The 12 watercourses with the most Thames Water overflows discharging into them.