- Associated Press - Monday, June 8, 2015

ST. MARYS, Ohio (AP) - Water warnings for swimmers are up again around Ohio’s largest inland lake.

Signs at beaches along Grand Lake St. Marys are telling visitors that toxic blue-green algae have made the water unsafe for swimming, especially for older and younger people and those with low immune systems.

The Columbus Dispatch (http://bit.ly/1GvaRdm ) reports that it’s the second Ohio inland lake plagued by algae this spring.

Blue-green algae are common in most Ohio lakes, fed by phosphorus from manure, fertilizers and sewage that rain washes from farm fields into nearby streams.

It has been an ongoing problem in recent years at Grand Lake St. Marys.

A toxic algae bloom in 2010 at the lake between Dayton and Toledo hurt the region’s tourism and highlighted problems from farm phosphorous runoff.

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Information from: The Columbus Dispatch, http://www.dispatch.com

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