Castle Point Borough Council has recorded a £1.8 million financial loss following the early surrender request for the Canvey Lake lease on Canvey Island, Essex. The figure was disclosed in a January 2026 budget update and reflects a combination of legal surrender costs, inherited maintenance liabilities and immediate capital required for emergency desilting and water treatment. Castle Point reviewed and accepted a request from Canvey Island Town Council to end its 15-year lease early after the town council said it could no longer afford the upkeep; the lake is about 8.3 hectares (around 20.5 acres).
The lake has struggled for years with recurring blue-green (cyanobacterial) algal blooms and heavy siltation, which have led to mass fish deaths. Council documents and reporting indicate the borough is now responsible for addressing problems that the existing lease — granted under a previous administration — did not include enforceable capital-works obligations for the leaseholder. Residents and campaigners have long pressed both councils to act to protect wildlife and address water-quality issues.
As well as being a local nature amenity, the lake forms an important part of Canvey Island’s surface-water storage and flood-management system. The Environment Agency and Essex County Council are part of a multi-agency restoration plan to ensure the lake can continue to hold stormwater in heavy rain; siltation has reduced capacity and increases flood risk for the island’s roughly 40,000 residents.
A phased restoration plan is underway: emergency works began in late 2025 and major mechanical desilting is scheduled for spring 2026. The council also plans to install permanent aeration systems (air pumps) to improve oxygen levels and help prevent future toxic algal blooms. Council leaders say they are committed to restoring the lake’s ecological health and returning the amenity to the community.
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