Official City of Worcester Seal Image

City of Worcester, MA

Announcements Image

Coes Reservoir to Undergo Herbicide Treatment

For Immediate Release: 6/26/2023 4:50 pm

UPDATE: Due to the rain forecasted for Wednesday, the aquatic plant treatment at Coes Reservoir is postponed. The treatment will be rescheduled at a later time.

WORCESTER, Mass. – The City of Worcester Department of Sustainability and Resilience has contracted the application of the herbicide imazamox (trade name Clearcast) to the northern part of Coes Reservoir for Wednesday, June 28, 2023.

We advise all persons to discontinue using water from Coes Reservoir for irrigation of plants or lawns or watering livestock, and to keep clear of application boats for the duration of the day. Recreational use in the swimming area may continue but boating in the northern portion is prohibited on the day of treatment. Beaches will be posted prior to the application. The water will be open for all uses again on Thursday, June 29.

Herbicide treatments are a safe and effective method to control the growth of the invasive aquatic plant Trapa natans, also referred to as water chestnut. The application of herbicides is a common practice to reduce invasive weed density and poses no risk to humans and animals after application is complete, though water use for irrigation is discouraged. This application has been approved by the Worcester Conservation Commission.

For questions, please contact 508-799-8325 or

City of Worcester
Worcester 311
Monday - Friday
8 a.m. - 5 p.m.
Phone: 311
Contact Us
Services Tour

Facebook, X, YouTube and Instagram Icons
ALERTWorcester Logo
City of Worcester Seal Image Worcester Public Schools Seal Image Worcester Public Library Logo
Home | Login | Disclaimer | Privacy Policy | Site Map

© 2024 Copyright City of Worcester, MA. All Rights Reserved.

Official City of Worcester, MA Website