06/10/2026
Please be advised that Pontoosuc Lake and Onota Lake will be chemically treated with aquatic herbicides to control invasive aquatic vegetation. Pontoosuc Lake will be treated on Wednesday, June 17 and Onota Lake will be treated on Tuesday, June 23.
During the treatment, both lakes will be closed to all water users including people and pets.
In addition, the following activity restrictions are in place:
Pontoosuc Lake
➡Boating, fishing, and swimming are prohibited in the lake from June 17 until June 18
➡Irrigation is prohibited from June 17 until June 23.
Onota Lake
➡Boating, fishing, and swimming are prohibited in the lake from June 23 until June 24
➡Irrigation is prohibited from June 23 until July 8.
Printed posters warning of these restrictions will be posted around the lake shoreline in advance of the treatment.
For more information, please call Parks, Open Space and Natural Resource Program Manager, Jim McGrath at (413) 499-9344.