Bourton On The Water CSO
Storm overflow run by Thames Water, discharging into Windrush & Groundwater.
"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 Thames Water's monitor log. 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.
What the 2025 return says
From Thames 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
335 discharge periods since 28 Dec 2022. 335 of them come from Thames Water's own event-duration-monitoring records (from its open data service, Dec 2022 – Mar 2026); this overflow has no live feed, so nothing after that log is held. The official annual count is the figure to quote.
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30 min
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30 min
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5 h 15 min
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1 h 30 min
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5 h 30 min
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4 h 15 min
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30 min
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5 h 0 min
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30 min
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5 h 15 min
Show 30 earlier (of 335)
| Started | Ended | Discharge time |
|---|---|---|
| 5 h 45 min | ||
| 3 h 15 min | ||
| 5 h 0 min | ||
| 30 min | ||
| 42 d 17 h | ||
| 20 h 15 min | ||
| 3 d 15 h | ||
| 5 h 30 min | ||
| 2 h 30 min | ||
| 45 min | ||
| 2 h 0 min | ||
| 14 h 30 min | ||
| 8 h 0 min | ||
| 2 h 15 min | ||
| 1 h 0 min | ||
| 30 min | ||
| 7 h 15 min | ||
| 1 d 7 h | ||
| 1 h 0 min | ||
| 30 min | ||
| 1 h 30 min | ||
| 45 min | ||
| 1 h 0 min | ||
| 30 min | ||
| 5 h 30 min | ||
| 1 h 0 min | ||
| 13 h 30 min | ||
| 6 d 18 h | ||
| 1 d 23 h | ||
| 30 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 350 raw blocks were merged into 335 continuous discharge periods (gaps under 15 min joined).
Rain nearby last 30 days
Nearest live rain gauge: Rainfall gauge nr Little Rissington, 1.3 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
Concerned about this overflow?
Report pollution you can see or smell to the regulator straight away; the company handles complaints about the overflow itself.
Write to the MP
The Environment Agency's return places this overflow in the North Cotswolds constituency. An MP can ask the company and the regulator questions on a constituent's behalf. These words carry the official figures; change them as you like.
The link opens Parliament's own "Find your MP", which gives the MP's name and how to write to them. FloodRadar sends nothing and keeps nothing you write. Check the constituency against your own address: an MP acts only for people who live in it.
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: Thames Water open data (its discharge alerts), © Thames Water Utilities Limited, used under its open data terms (https://data.thameswater.co.uk/s/terms-of-service). Changed by FloodRadar: each Start alert is paired with the Stop that follows it to make one discharge period; monitor-offline alerts 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. Constituency and council area from the EA's return: contains OS data © Crown copyright and database right 2026.