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Water in Toledo, Ohio and surrounding areas remained officially undrinkable on Sunday, more than 24 hours after a do-not-drink order went into place for 500,000 Ohioans.

Water at a Toledo treatment plant tested positive for a toxin on Saturday, leading the governor to declare a state of emergency in three counties, state officials told the Los Angeles Times.

In a morning news conference, Toledo’s mayor said more results from new tests on the water would be available around noon local time on Sunday: “This is not over yet,” he said.

Ohio Gov. John Kasich declared a state of emergency for residents of Lucas, Wood and Fulton counties early Saturday after two water samples from a Toledo water treatment plant tested positive for microcystin, a toxin possibly caused by an algae bloom in Lake Erie.

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