Vale of Glamorgan coastline
Coast & beaches
Bathing water quality, sewage monitoring & coastal map
Storm Overflow Status
Live⚠️ Bathing water affected
Active
0
Last 24h
8
Investigating
0
Clear
36
Brockhill Rise Storm Overflow
→ Bristol Channel
🏊 Penarth Beach
Barry Town Long Sea Storm Overflow
→ Severn Estuary
🏊 Cold Knap Barry, Whitmore Bay Barry Island, Jackson's Bay Barry Island, Watch House Bay
St John Street Ogmore Vale Storm Overflow
→ Ogwr Fach River
Bonvilston East WwTW Overflow
→ Nant Llancarfan
Barry Docks Pumped Storm Overflow
→ Barry No, 2 Dock
Penarth Head Storm Overflow
→ Severn Estuary
🏊 Penarth Beach
Penarth Kymin Storm Overflow
→ Bristol Channel
🏊 Penarth Beach, Jackson's Bay Barry Island
Cemetery Road Ogmore Vale Storm Overflow
→ Ogwr Fawr
Source: Welsh Water live overflow monitoring · Refreshes every 15 min · 17:08
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.