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Vale of Glamorgan coastline

Coast & beaches

Bathing water quality, sewage monitoring & coastal map

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Storm Overflow Status

Live
✅ All clear

Active

0

Last 24h

1

Investigating

1

Clear

43

Cowbridge Llanbethian WwTW Storm Overflow

→ River Thaw

🟠 Recent (24h)30 May, 11:23

St Cadoc's Avenue Dinas Powys Storm Overflow

→ Cadoxton River

🟡 Investigating27 Feb, 22:45

Brockhill Rise Storm Overflow

→ Bristol Channel

🏊 Penarth Beach

✅ Clear19 May, 00:15

River Street Ogmore Vale Storm Overflow

→ Ogwr Fawr River

✅ Clear17 Dec, 20:12

Railway Terrace Ogmore Vale Storm Overflow

→ Ogwr Fawr River

✅ Clear29 Mar, 17:45

St John Street Ogmore Vale Storm Overflow

→ Ogwr Fach River

✅ Clear20 May, 00:45

Barry Docks Pumped Storm Overflow

→ Barry No, 2 Dock

✅ Clear26 May, 05:00

Broad Street Barry Storm Overflow

→ Unnamed Culvert leading to Barry Dock No, 1

🏊 Jackson's Bay Barry Island, Whitmore Bay Barry Island

✅ Clear14 Nov, 16:15

Source: Welsh Water live overflow monitoring · Refreshes every 15 min · 19:43

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Coastal Map

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Historic Overflow Data

Monitoring 2024

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

246 spills7 months, 9 days

CSO and EO at Ewenni No 2 SPS

211 spills6 months, 19 days

CSO at Hillside Avenue Llanharan

205 spills4 months, 7 days

Bonvilston East WwTW Overflow

203 spills2 months, 18 days

Cowbridge Wastewater Treatment Works

191 spills4 months, 27 days

Source: Public environmental monitoring data · Event Duration Monitoring annual returns · Data fetched 06/03/2026

Data from environmental monitoring and government open data.