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.

News & Research
Stay informed. Stay healthy.



Interactive Maps

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.

Explore related issues