Maesteg Market Storm Overflow
Storm overflow run by Dwr Cymru Welsh Water, discharging into River Llynfi.
"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
Dŵr Cymru Welsh Water's annual Event Duration Monitoring return to Natural Resources Wales (12/24-hour spill count), as compiled by The Rivers Trust. 2026 is our own running count, the same way, from the live feed since 28 February (when we began keeping every discharge it reports) — so it can only be lower than the full year. The official figure is published next spring.
"No data" means the monitor was not working or not required to report that year — not zero.
Other outlets here
Dwr Cymru Welsh Water runs 2 other overflows within 300 m that also discharge into River Llynfi. They share the sewer and the storm, so one outlet's figures are only part of what reaches the water.
This overflow: 17 spills in 2025. Distances are between the published outlet points.
Discharges we have recorded
239 discharge periods since 25 Oct 2020. 238 of them come from Dwr Cymru Welsh Water's own event-duration-monitoring records (published by the company, Oct 2020 – Nov 2025); the live feed adds anything after that. The official annual count is the figure to quote.
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Thu 12 Mar 2026, 21:0114 min
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Tue 4 Nov 2025, 16:3015 min
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Wed 17 Sep 2025, 16:4515 min
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Wed 17 Sep 2025, 10:4515 min
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Sun 14 Sep 2025, 14:3015 min
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Thu 11 Sep 2025, 08:1515 min
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Wed 10 Sep 2025, 09:1515 min
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Tue 9 Sep 2025, 20:3015 min
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Mon 8 Sep 2025, 21:3015 min
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Mon 8 Sep 2025, 18:3015 min
Show 30 earlier (of 239)
| Started (UK time) | Ended | Discharge time |
|---|---|---|
| 15 Jul 2025, 08:45 | 09:00 | 15 min |
| 13 Jun 2025, 16:30 | 16:45 | 15 min |
| 12 Jun 2025, 10:15 | 10:30 | 15 min |
| 7 Jun 2025, 01:30 | 01:45 | 15 min |
| 3 Jun 2025, 06:15 | 06:30 | 15 min |
| 26 May 2025, 23:00 | 23:15 | 15 min |
| 18 Apr 2025, 18:00 | 18:15 | 15 min |
| 20 Feb 2025, 13:00 | 13:15 | 15 min |
| 19 Feb 2025, 21:00 | 21:15 | 15 min |
| 28 Jan 2025, 02:45 | 03:00 | 15 min |
| 6 Dec 2024, 21:15 | 21:30 | 15 min |
| 24 Nov 2024, 05:30 | 05:45 | 15 min |
| 24 Nov 2024, 00:30 | 00:45 | 15 min |
| 23 Nov 2024, 21:30 | 21:45 | 15 min |
| 23 Nov 2024, 14:00 | 14:15 | 15 min |
| 18 Nov 2024, 18:45 | 19:00 | 15 min |
| 27 Oct 2024, 01:30 | 01:45 | 15 min |
| 26 Sep 2024, 06:45 | 07:00 | 15 min |
| 26 Sep 2024, 03:15 | 03:30 | 15 min |
| 6 Sep 2024, 20:30 | 20:45 | 15 min |
| 2 Apr 2024, 13:15 | 14:15 | 45 min |
| 2 Apr 2024, 02:45 | 12:45 | 9 h 30 min |
| 6 Dec 2023, 14:45 | 00:00 | 25 d 4 h |
| 6 Dec 2023, 00:00 | 00:15 | 15 min |
| 5 Dec 2023, 15:30 | 15:45 | 15 min |
| 5 Dec 2023, 14:15 | 14:30 | 15 min |
| 2 Dec 2023, 20:15 | 20:30 | 15 min |
| 2 Dec 2023, 17:00 | 17:15 | 15 min |
| 1 Dec 2023, 04:00 | 04:15 | 15 min |
| 1 Dec 2023, 03:15 | 03:30 | 15 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 309 raw blocks were merged into 239 continuous discharge periods (gaps under 15 min joined).
Rain nearby last 30 days
Nearest live rain gauge: Croeserw Raingauge, 4.1 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.
Live status: © Dŵr Cymru Welsh Water, from its Storm Overflow Map. Spill-event history: © Dŵr Cymru Welsh Water's published EDM start/stop records. Annual figures: The Rivers Trust EDM compilation, © Dŵr Cymru/Welsh Water, Open Government Licence. Times are shown in UK local time. FloodRadar republishes the monitor's status; it does not measure discharges itself.