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City treats Indian Lake for dense native vegetation; herbicide use followed by temporary fish losses, staff to adjust public messaging
Summary
DSR described a fast-acting herbicide treatment for dense elodea growth at Indian Lake, a subsequent drop in dissolved oxygen and a small fish kill, and plans for an 18-inch winter drawdown and clearer public communications.
WORCESTER, Mass. (July 28, 2025) — City environmental staff described a sequence of lake management steps at Indian Lake this summer: alum dosing to reduce phosphorus, rapid growth of the native plant elodea, a low-dose herbicide treatment to remove dense mats, an associated dip in dissolved oxygen that caused a limited fish kill, and follow-up mechanical and aeration efforts that staff said have restored lake conditions.
What staff said: John (DSR staff) explained the sequence and the trade-offs. He said the alum dosing station improved water clarity by binding phosphorus and reducing material that can feed…
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