Blue-green algae blooms such as this one at Grand Lake St. Mary’s in Mercer County, Ohio, can be harmful to those who come in contact with them. Photo supplied by the Ohio Department of Natural Resources

Blue-green algae blooms such as this one at Grand Lake St. Mary’s in Mercer County, Ohio, can be harmful to those who come in contact with them. Photo supplied by the Ohio Department of Natural Resources

LIBERTY — Both state recreation areas at Brookville Lake have high counts of blue-green algae, according to the Indiana Department of Natural Resources.

Testing of lake water on July 20 showed high cell counts at both the Mounds and Quakertown state recreation areas. Whitewater Memorial State Park is not included in the blue-green algae advisory issued for Brookville Lake.

Two other Indiana lakes, Cecil Harden Raccoon Lake and Potato Creek State Park’s Worster Lake, also have high blue-green algae counts.

Warnings about algae blooms at Brookville Lake have been a near-annual occurrence recently.

The blooms are caused by nutrients entering the lake water. Farm and lawn fertilizer, runoff from feed lots and golf courses, and discharges from unregulated rural septic systems are among the nitrogen sources that produce the blooms, which are enhanced by warm weather and sunlight, according to the DNR.

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