Llanwddyn Wastewater Treatment Works
Storm overflow run by Hafren Dyfrdwy.
"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
Hafren Dyfrdwy's annual Event Duration Monitoring return to Natural Resources Wales (12/24-hour spill count), as compiled by The Rivers Trust.
"No data" means the monitor was not working or not required to report that year — not zero.
Discharges we have recorded
47 discharge periods since 1 Jan 2025. 47 of them come from Hafren Dyfrdwy's own event-duration-monitoring records (published by the company, Jan 2025 – Dec 2025); 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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2 d 1 h
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1 d 3 h
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3 d 16 h
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21 h 0 min
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13 h 14 min
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1 d 19 h
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6 d 23 h
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5 d 19 h
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4 h 52 min
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3 d 19 h
Show 30 earlier (of 47)
| Started | Ended | Discharge time |
|---|---|---|
| 1 d 21 h | ||
| 7 d 19 h | ||
| 5 h 53 min | ||
| 1 d 2 h | ||
| 1 d 17 h | ||
| 4 d 10 h | ||
| 2 h 34 min | ||
| 2 h 36 min | ||
| 7 h 42 min | ||
| 2 h 9 min | ||
| 2 h 0 min | ||
| 4 h 46 min | ||
| 3 h 3 min | ||
| 1 h 36 min | ||
| 23 min | ||
| 1 d 15 h | ||
| 27 min | ||
| 10 h 33 min | ||
| 2 d 2 h | ||
| 5 h 23 min | ||
| 4 h 23 min | ||
| 14 h 51 min | ||
| 5 h 43 min | ||
| 3 h 51 min | ||
| 4 d 6 h | ||
| 4 d 19 h | ||
| 3 d 0 h | ||
| 5 h 5 min | ||
| 2 h 22 min | ||
| 1 h 35 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 50 raw blocks were merged into 47 continuous discharge periods (gaps under 15 min joined).
Rain nearby last 30 days
Nearest live rain gauge: Vyrnwy Raingauge, 0.6 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
Concerned about this overflow?
Report pollution you can see or smell to the regulator straight away; the company handles complaints about the overflow itself.
Spill-event history: © Hafren Dyfrdwy, published on Stream (data.streamwaterdata.co.uk) under CC BY 4.0. Annual figures: The Rivers Trust EDM compilation, © Hafren Dyfrdwy, Open Government Licence. Times are shown in UK local time. FloodRadar republishes the monitor's status; it does not measure discharges itself.