Milford Road Pennington WwTW
Storm overflow run by Southern Water, discharging into The Solent.
"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 Southern Water's monitor log and the live feed. 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.
Twin outlet
Southern Water runs another overflow within 300 m that also discharges into The Solent. They share the sewer and the storm, so one outlet's figures are only part of what reaches the water.
This overflow (Milford Road Pennington SSO - 115419): 66 spills in 2025. Distances are between the published outlet points. The names in brackets are Southern Water's own, from its return.
What the 2025 return says
From Southern 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
165 discharge periods since 7 Feb 2024, 1 still open. 181 of them come from Southern Water's own event-duration-monitoring records (from its Rivers and Seas Watch service, Feb 2024 – Oct 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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11 h 38 min
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4 h 16 min
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5 h 43 min
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3 h 45 min
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11 min
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3 h 16 min
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2 h 45 min
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7 min
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11 min
Show 30 earlier (of 165)
| Started | Ended | Discharge time |
|---|---|---|
| 12 min | ||
| 16 min | ||
| 15 min | ||
| 1 d 7 h | ||
| 17 min | ||
| 4 d 6 h | ||
| 2 d 18 h | ||
| 4 h 43 min | ||
| 7 min | ||
| 5 h 51 min | ||
| 21 min | ||
| 16 h 32 min | ||
| 21 h 40 min | ||
| 9 min | ||
| 19 d 7 h | ||
| 5 d 13 h | ||
| 17 min | ||
| 12 d 10 h | ||
| 11 min | ||
| 3 min | ||
| 6 d 23 h | ||
| 6 min | ||
| 5 min | ||
| 17 min | ||
| 3 h 54 min | ||
| 2 min | ||
| 6 h 22 min | ||
| 4 min | ||
| 3 h 1 min | ||
| 17 min |
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 283 raw blocks were merged into 165 continuous discharge periods (gaps under 15 min joined).
What the feed showed
FloodRadar's own record of every change of state Southern Water's live feed has shown for this overflow, kept since : 5 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 5 states
| Seen | Status | Since | Latest discharge |
|---|---|---|---|
| Discharging | → no end yet | ||
| Not discharging | → | ||
| Discharging | → no end yet | ||
| Not discharging | → | ||
| Discharging | → no end yet |
Rain nearby last 30 days
Nearest live rain gauge: Rainfall gauge nr Everton, 3.6 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: © Southern 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. Spill-event history: Southern Water's Rivers and Seas Watch release history (riversandseaswatch.southernwater.co.uk), © Southern Water. Shown by FloodRadar: only releases Southern Water marks Genuine and that have ended; those it marks Not Genuine or still has under review are left out. Times are shown in UK local time. FloodRadar republishes the monitor's status and the EA's figures; it does not measure discharges itself.