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Constantine STW: sewage overflow history

Review available Environment Agency annual monitoring returns for Constantine STW. Compare reported spill counts, total duration and monitor operation by year, with source details and gaps in the series identified.

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Annual monitoring returns

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	41	58.94	100
2024	37	41.97	100
2023	63	85.15	100
2022	48	40.59	100
2021	51	89.14	100

Published record details

Reference: SBB00303
Location: Lestraines River
Coordinates: 50.11658, -5.16713
Watercourse: Lestraines River(S)
Sewerage company: South West Water
Asset type: Inlet SO at WwTW
Permit reference: 302487
Discharge grid reference: SW73682886
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Lestraines River

Location

Constantine STW
50.11658, -5.16713

Understanding annual storm overflow figures

The Environment Agency's annual returns report storm overflow monitoring information supplied by water companies. Spill counts use the regulatory 12/24-hour block method, so a counted spill is not necessarily a single uninterrupted discharge. Duration is the reported total time in spill, rather than the volume of sewage discharged. Monitor operation indicates the percentage of the reporting period for which the monitor operated. Missing values, incomplete monitoring and changes in recorded outlet details can affect comparisons between years. These annual figures describe historical reporting periods, not live discharge conditions or the cause of sewage problems at an individual property.

Nearby records

Penbothidno CSO0 km Constantine Bridge Pumping Station0.7 km Shipwrights Pumping Station3.4 km Pennance Mill Tidal Tanks CSO5.5 km Swanpool Pscso/Eo6.9 km

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