The state of Ohio expressed deep concerns about the safety of Toledo's water supply in the months before a two-day restriction on drinking the water that was caused by a toxin suspected from a Lake Erie algal bloom.

The city's water-treatment plant was "vulnerable to potential failures that could severely impact the city's ability to provide adequate quantities of safe water to its citizens," Ohio Environmental Protection Agency Director Craig W. Butler wrote in a June 9 letter to Toledo Mayor D. Michael Collins.

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