Collin O'Mara, president and CEO of the National Wildlife Federation, gestures as he talks about algae near the City of Toledo water intake crib, 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)

The mayor of Toledo, Ohio, has lifted a water ban that left 400,000 Ohio and Michigan residents scrambling for water for drinking, cooking and bathing.

Mayor D. Michael Collins says Monday that the Lake Erie drinking water is safe and that the warning has been lifted.

The announcement comes after people in northwestern Ohio and southeastern Michigan were told to avoid drinking tap water because of toxins contaminating the , possibly from algae.

Toledo officials issued the water warning in Ohio's fourth-largest city early Saturday.

The Ohio National Guard and other state agencies have been delivering pallets of to the city and operating water purification systems to make more drinkable .