Officials say when bacteria levels exceed EPA standards, the area is closed for swimming or any activity where your head may go underwater.
"What we're trying to do is protect the public from any human contact they may have with these two bacteria in the event they get above a certain standard, it presents a certain risk that could adversely impact their health," Wake County Environmental Services Director Tommy Esqueda said.
The county says they test recreational lakes for bacteria --including Enterococci and E coli-- routinely, as well as weekly each summer.
Wake County officials say this kind of thing is not unusual. Last year it was the Beaver Dam and Holly Point swim area that closed.
Officials are also reminding patrons to always wash your hands with soap and water and shower after swimming, tubing or skiing in area lakes.
