Vale of Glamorgan coastline
Coast & beaches
Bathing water quality, sewage monitoring & coastal map
Storm Overflow Status
Live⚠️ Bathing water affected
Active
0
Last 24h
1
Investigating
1
Clear
44
St Nicholas WwTW Storm Overflow
→ Tributary of Aberbach Stream
Nant Talwg Storm Overflow
→ Nant Talwg
🏊 Cold Knap Barry
Brockhill Rise Storm Overflow
→ Bristol Channel
🏊 Penarth Beach
Broad Street Barry Storm Overflow
→ Unnamed Culvert leading to Barry Dock No, 1
🏊 Jackson's Bay Barry Island, Whitmore Bay Barry Island
St John Street Ogmore Vale Storm Overflow
→ Ogwr Fach River
River Street Ogmore Vale Storm Overflow
→ Ogwr Fawr River
Railway Terrace Ogmore Vale Storm Overflow
→ Ogwr Fawr River
West Aberthaw WwTW Storm Overflow
→ Bristol Channel
Source: Welsh Water live overflow monitoring · Refreshes every 15 min · 09:21
Coastal Map
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Historic Overflow Data
Annual Event Duration Monitoring — how often each site discharged untreated sewage during 2024.
Sites Monitored
133
Total Spills
5,107
Total Duration
5.8 years
Avg Spills/Site
39
💩 Worst Overflow Sites (2024)
LLANCARFAN STW
CSO and EO at Ewenni No 2 SPS
CSO at Hillside Avenue Llanharan
Bonvilston East WwTW Overflow
Cowbridge Wastewater Treatment Works
Source: Public environmental monitoring data · Event Duration Monitoring annual returns · Data fetched 06/03/2026
Data from environmental monitoring and government open data.