Questions and answers about Lake Erie toxic algae

The City of Toledo water intake crib is surrounded by algae, Sunday, Aug. 3, 2014, in Lake Erie, about 2.5 miles off the shore of Curtice, Ohio. More tests are needed to ensure that toxins are out of Toledo's water supply, the mayor said Sunday, instructing the 400,000 people in the region to avoid drinking tap water for a second day. Toledo officials issued the warning early Saturday after tests at one treatment plant showed two sample readings for microcystin above the standard for consumption, possibly because of algae on Lake Erie. (AP Photo/Haraz N. Ghanbari)Hundreds of thousands of people in Toledo, Ohio, and nearby southeastern Michigan were unable to use tap water from Saturday until Monday morning because of unsafe levels of a contaminant called microcystin in Lake Erie. Here are questions and answers about the situation: