TOLEDO, Ohio (AP) --Toledo Mayor D. Michael Collins says tests done by state and federal authorities on the city's water supply indicate a positive trend, but additional testing is necessary.
Ohio's fourth-largest city warned residents not to use city water early Saturday. Tests at one treatment plant showed readings for microcystin above the standard for consumption, most likely from algae on the lake.
Residents told not to drink, brush their teeth or wash dishes with the water descended on truckloads of bottled water delivered from across the state on Sunday. The Ohio National Guard is using water purification systems to produce drinkable water.
The Toledo Zoo says it's using its own water reserves for the animals as drinking water for some 400,000 people in the region remains off limits because of toxins in Lake Erie.
The zoo says none of the animals has shown any signs of sickness but zookeepers are monitoring them. Flamingos are the only animals taken off exhibit Sunday as a precaution.
The city council is to review the latest test results at its regularly-scheduled meeting on Monday.