Update Monday, August 4th, 9:40am: Toledo Mayor D. Michael Collins says the w ater ban is lifted in northwest Ohio and drinking water for 400,000 residents is safe. We'll have more details as they come in. Sunday, August 3, 2014 : More than 400,000 people in Toledo and surrounding areas are without drinking water for a second day, due to a huge cyanobacteria bloom in Lake Erie, where the area gets its water supply. The cyanobacteria, s ometimes referred to as blue-green algae, create a dangerous toxin called microcystin , and exposure to the toxin can cause serious health issues. On Sunday afternoon, a boat hastily chartered by the National Wildlife Federation cruises over to see the massive cyanobacteria bloom floating near the city of Toledo. It's hot, and it's a pretty day, but the water looks oddly bright green. That's the cyanobacteria bloom. The blooms have been appearing for a couple of decades, but they're getting worse. Toledo Councilman Larry Sykes says he and other officials have been worried about this for a long time.