Charles County officials are urging residents to stay away from water in the Potomac River and Mattawoman Creek because of toxic algae.

The brightly colored blue-green algae is known as Microcystis aeruginosa. Authorities say it is currently at five times the recommended level and can cause health issues for humans and animals.

"If you're in the water or have water contact... you can have minor skin irritations. You don't want to drink it because it may cause naseua," said Tom Parham of the Maryland Department of Natural Resources. "If you see it, common sense is just stay away."

The blue-green algae has been reported in both Mattawoman Creek and the area of the Potomac near where the creek empties into it.  Biologists blame hot weather, a lack of rain, fertilizer runoff and pollution for the greater-than-usual algae bloom.

Charles County spokesman Jason Lang says residents who come in contact with the algae should wash with fresh water and consult a doctor if skin irritation occurs.

Boaters enjoying the park say they plan to take extra precautions.

"It kind of turns my stomach," said Matthew Benner. "I won't be swimming in it. Hopefully I won't fall out of the boat."

A more normal level of algae is expected to return by November.

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