The Michigan departments of Environmental Quality and Agriculture said Thursday they'll work with farmers and municipal wastewater system operators

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TRAVERSE CITY, Mich. -- Michigan officials are promising further efforts to prevent the kind of toxic algae growth in Lake Erie that forced a recent shutdown of the public drinking water system in Toledo.

The Michigan departments of Environmental Quality and Agriculture said Thursday they'll work with farmers and municipal wastewater system operators to reduce the amount of phosphorus and other nutrients that reach the lake.

They called for the federal government to establish a national drinking water standard for microcystin, the toxin produced by blue-green algae.

Environmental Quality Director Dan Wyant says federal agencies also should halt open-water disposal of dredged sediments from the Toledo harbor, which contain nutrient material.

About 30,000 residents of southeastern Michigan get tap water from the Toledo system and were affected by the shutdown this month.

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