Vale of Glamorgan coastline

Coast & beaches

Bathing water quality, sewage monitoring & coastal map

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Storm Overflow Status

Live

⚠️ 7 active

⚠️ Bathing water affected

Penarth Beach — Brockhill Rise Storm Overflow (overflow not operating (has in the last 24 hours))

Cold Knap Barry, Whitmore Bay Barry Island, Jackson's Bay Barry Island, Watch House Bay — Barry Town Long Sea Storm Overflow (overflow not operating (has in the last 24 hours))

Cold Knap Barry, Whitmore Bay Barry Island, Jackson's Bay Barry Island, Watch House Bay — Barry Town Short Sea Storm Overflow (overflow not operating (has in the last 24 hours))

Penarth Beach, Jackson's Bay Barry Island — Penarth Kymin Storm Overflow (overflow not operating (has in the last 24 hours))

Penarth Beach — Penarth Head Storm Overflow (overflow not operating (has in the last 24 hours))

Col-Huw Beach (Llantwit Major) — Llantwit Major Beach Road Storm Overflow (overflow not operating (has in the last 24 hours))

Col-Huw Beach (Llantwit Major) — Llantwit Major Beach Road Settled Storm Overflow (overflow not operating (has in the last 24 hours))

Cold Knap Barry — Nant Talwg Storm Overflow (overflow not operating (has in the last 24 hours))

Active

Last 24h

Investigating

Clear

⚠️West Aberthaw WwTW Storm Overflow

→ Bristol Channel

🔴 Discharging26 Oct, 10:45

⚠️St John Street Ogmore Vale Storm Overflow

→ Ogwr Fach River

🔴 Discharging26 Oct, 17:00

⚠️Wick WwTW Overflow

→ River Alyn

🔴 Discharging26 Oct, 08:15

⚠️Bonvilston East WwTW Overflow

→ Nant Llancarfan

🔴 Discharging26 Oct, 08:30

⚠️St Cadoc's Avenue Dinas Powys Storm Overflow

→ Cadoxton River

🔴 Discharging26 Oct, 13:48

⚠️Cowbridge Llanbethian WwTW Storm Overflow

→ River Thaw

🔴 Discharging21 Oct, 23:38

⚠️Cemetery Road Ogmore Vale Storm Overflow

→ Ogwr Fawr

🔴 Discharging22 Oct, 19:15

Brockhill Rise Storm Overflow

→ Bristol Channel

🏊 Penarth Beach

🟠 Recent (24h)26 Oct, 08:15

Source: Welsh Water live overflow monitoring · Refreshes every 15 min · 00:05

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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

💩 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.