A toxin discovered in a northwestern Ohio treatment plant left 500,000 people scrambling for drinking water for a second day Sunday.

Toledo Mayor D. Michael Collins said preliminary testing showed toxin levels were improving at the city's plant, but he said officials were waiting for federal officials to analyze more samples before determining if the water is safe to drink.

"All of the results continue to improve, which gives us hope," Collins said Sunday. "But this is not over yet."

Residents of Toledo, its suburbs and small areas of southeastern Michigan began lining up for water Saturday after news of the contamination surfaced. Ohio Gov. John Kasich declared a state of emergency for Lucas, Wood and Fulton counties and deployed the National Guard to make water available to the area.

The National Guard had produced 33,000 gallons of drinkable water by Sunday morning, and an additional 15,000 gallons had been delivered in collapsible containers.

More here: http://www.usatoday.com/story/news/nation/2014/08/03/toledo-toxins-...