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Algae Treatment Scheduled for June 29 at Coes Reservoir

For Immediate Release: 6/27/2022 9:46 am

The City of Worcester Department of Sustainability and Resilience has hired contractors to apply a treatment of copper sulfate to Coes Reservoir on Wednesday, June 29.

This is a preventative treatment, and there is currently no threat of harmful algae exposure.

The day of the treatment, we advise all persons to stay out of the water, discontinue boat use and fishing, and keep their pets out of the water.

Beaches will be posted prior to the application. It is planned to reopen the lake the following day.

Copper sulfate is a safe and effective way to control the growth of harmful, toxin-producing algae. The application of copper sulfate is a common practice to maintain a healthy lake and poses minimal risk to humans and animals after application is complete. The application is coordinated with the Tatnuck Brook Watershed Associations and has been approved by the Worcester Conservation Commission.

For more information on toxin-producing algae (i.e. cyanobacteria) please see our video series “The Blue Space Minute."

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