3 summers after costly cyanobacteria treatment, a small NH lake is still in the clear

By: Molly Rains

Outlets: NH Bulletin

Published: September 25, 2026

Words: 910

Last Updated: 2 weeks, 3 days ago

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Clear waters in Moultonborough’s Lake Kanasatka this summer strengthened residents’ hopes that an expensive, last-ditch chemical treatment undertaken several years ago was paying off.

This year has been a “beautiful” one on the lake, said waterfront resident Kevin Kelly. Conditions have improved each year since the treatment was applied in 2024, after anguish and health concerns over recurrent cyanobacteria blooms peaked the year before.

For Lake Kanasatka, the treatment “is …

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