When more than 400,000 people were left without safe drinking water in Ohio and Michigan this past weekend, Lake Erie's troubling algae blooms received intense scrutiny. Though people were told Monday it was once again safe to drink the water, there's still major concern: harmful algae blooms have been a growing problem in Lake Erie for the last decade, and are a worldwide issue with consequences for the environment and human health.
Water treatment tests over the weekend had found unsafe levels of microcystin, a toxin that can be created by cyanobacteria algae blooms, in the Toledo water system that serves Ohioans and some Michiganders.
Tim Davis, a harmful algae specialist with the National Oceanic and Atmospheric Administration's Great Lakes Environmental Research Lab, was on the lake Monday.
“The water looks like someone painted the surface with green paint,” Davis said, according to NASA.