Southend Sewage Works
Storm overflow run by Anglian Water, discharging into Thames Estuary.
"Not discharging" means the company's monitor reports no discharge right now — not that the water is clean. The feed publishes status only; no discharge volume is measured.
Year by year
The Environment Agency's official annual returns, counted the EA's way (12/24-hour spills). 2026 is our own running count, the same way, from Anglian Water's monitor log and the live feed. The feed reports only each overflow's latest discharge, so a discharge it moved past before we saw it end is counted as one spill with no hours: the hours are a floor. The official figure is published next spring.
A spill is the EA's 12/24-hour count: the first 12 hours of a discharge count as one, each further 24 hours with discharge as one more. "Monitor" is the share of that year the monitor was working, so a 0 beside a working monitor is a real zero; "no data" means the monitor produced no usable data that year — not zero. Years before 2024 are matched to this site by name and location, because the EA's site IDs changed that year; a monitor figure beside one of them means the outlet's permit confirms the match.
Other outlets here
Anglian Water runs 3 other overflows within 300 m that also discharge into Thames Estuary. They share the sewer and the storm, so one outlet's figures are only part of what reaches the water.
This overflow (Southend STW): 94 spills in 2025. Distances are between the published outlet points. The names in brackets are Anglian Water's own, from its return.
What the 2025 return says
From Anglian Water's annual return to the Environment Agency for this overflow.
This overflow spilled often enough to trigger the EA's high-spill review; the review line is the company's own stated reason.
Discharges we have recorded
1,186 discharge periods since 1 Jan 2024, 1 still open, 26 whose end the feed never gave. 976 of them come from Anglian Water's own event-duration-monitoring records (published on Stream, Jan 2024 – Jul 2026); the live feed adds anything after that. The official annual count is the figure to quote.
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ongoing
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1 min
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0 min
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0 min
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0 min
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not captured
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1 min
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not captured
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0 min
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0 min
Show 30 earlier (of 1,186)
| Started | Ended | Discharge time |
|---|---|---|
| not captured, before | not captured | |
| 0 min | ||
| 10 min | ||
| 0 min | ||
| 8 min | ||
| 0 min | ||
| 0 min | ||
| 0 min | ||
| 0 min | ||
| 0 min | ||
| 0 min | ||
| not captured, before | not captured | |
| 2 h 36 min | ||
| 1 min | ||
| not captured, before | not captured | |
| 0 min | ||
| not captured, before | not captured | |
| 0 min | ||
| 1 min | ||
| not captured, before | not captured | |
| 2 min | ||
| 1 h 23 min | ||
| 0 min | ||
| 0 min | ||
| not captured, before | not captured | |
| 0 min | ||
| 0 min | ||
| 0 min | ||
| 1 min | ||
| not captured, before | not captured |
The year figures above use the EA's 12/24-hour counting method, so they are comparable with the official figures; the monitor log's 2,288 raw blocks were merged into 1,186 continuous discharge periods (gaps under 15 min joined).
What the feed showed
FloodRadar's own record of every change of state Anglian Water's live feed has shown for this overflow, kept since : 32 states. The feed publishes its status now and its latest discharge, nothing older; the discharges above are read from this. It is here so the figures can be checked.
Show the last 32 states
| Seen | Status | Since | Latest discharge |
|---|---|---|---|
| Discharging | → no end yet | ||
| Discharging | → no end yet | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Discharging | → no end yet | ||
| Discharging | → no end yet | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Discharging | → no end yet | ||
| Discharging | → no end yet | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Discharging | → no end yet | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Discharging | → no end yet | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Not discharging | → | ||
| Discharging | → no end yet | ||
| Discharging | → no end yet | ||
| Not discharging | → |
Rain nearby last 30 days
Nearest live rain gauge: Rainfall gauge nr Southend-on-Sea, 3.2 km away. Brown shading = when this overflow was discharging; ▼ = a discharge start.
Overflow shading is a timing match, not proof of cause — heavy rain and spills share a trigger. Times come from the water company’s event-duration monitor (site status only; no discharge volume is published).
Where it is
Tell me when this overflow discharges
One message when the company's monitor reports a new discharge here. At most one every 6 hours.
Setting this alert needs JavaScript. The alerts you already have are on your alerts page.
The alert repeats the monitor's status: whether the overflow is discharging, not how much or why. It can only tell you about a discharge that starts after you turn it on.
Concerned about this overflow?
Report pollution you can see or smell to the regulator straight away; the company handles complaints about the overflow itself.
Live status: © Anglian Water storm overflow activity data, licensed under CC BY 4.0. Annual spill figures: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence (OGL) v3.0. Storm-overflow spill events: © the respective water company, published on Stream (data.streamwaterdata.co.uk) under CC BY 4.0. Discharges marked "EA start/stop data": Environment Agency Event Duration Monitoring storm overflow start/stop detailed data, © Environment Agency copyright and/or database right 2026, Open Government Licence v3.0; the companies' monitor records as the EA received them, not verified by the EA. Discharges marked "via Top of the Poops", come from Top of the Poops' record of the same company feed, used under CC BY-SA 4.0: the feed's own start and end times as its pages print them, not their derived hours. Times are shown in UK local time. FloodRadar republishes the monitor's status and the EA's figures; it does not measure discharges itself.