Lakes, reservoirs, rivers and streams are critical sources of drinking water. But they’re threatened by toxic algae blooms, fueled by polluted runoff from farms and made worse by climate change.

Health effects of cyanotixin table
Tip Sheet

Algal blooms don’t always produce toxic microcystins. When they do they’re not just a gross and smelly nuisance, but can pose serious health hazards to people, pets and wildlife.

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EWG’s ongoing tracking has found more than 1,000 communities with news reports of algae blooms in 49 states since 2010 – an increase of more than 600 percent in the past decade.

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