Cyanobacteria, and their toxins, are incredibly diverse. How can risk be measured?

By: Molly Rains

Outlets: NH Bulletin

Published: October 9, 2026

Words: 1,293

Last Updated: 1 week, 2 days ago

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When a greenish cloud, surface scum or other suspicious algae appears in a previously clear lake, the message is clear: Stay away. As cyanobacteria blooms become more common in New Hampshire, that precaution has become common practice across the state.

The reason? Cyanobacteria, an ancient single-celled organism that multiplies to excess when nutrients and heat are plentiful, can produce toxins harmful to the skin, liver, nervous system, stomach and more. Effects range from …

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