The City of Toledo has issued a “Do Not Drink” advisory for residents served by Toledo Water after chemical tests confirmed the presence of unsafe levels of the algal toxin Microcystin in the drinking water plant’s finished water. The advisory, spanning three counties in Ohio and one in Michigan, leaves more than 400,000 people in the Toledo area without drinking water.

“Do not drink the water,” Melanie Amato, public information officer for the Ohio Department of Health, told Circle of Blue. “You can shower in it, bathe in it, but do not try to ingest it. That means no washing dishes; you can brush your teeth with it as long as you don’t swallow any water, but we recommend using bottled water for that as well.”