Beaverdam Beach and Sandling Beach are now off limits to swimmers.
"Our goal is to eliminate the potential for people to come into contact with excessive levels of bacteria, as that could result in creating illness conditions for individuals. We will continue to collect water samples on a daily basis for the closed areas and reopen the lake for swimming as soon as the bacteria levels fall within the EPA-established standards," said Wake County Environmental Services Watershed Manager Kathryn Hobby. "After we observe two consecutive days of water samples meeting the standards, the area will be reopened for recreation."
Elevated bacteria levels is usually a problem that plagues Falls Lake every year.
Officials said other parts of Falls Lake remain open to fishing and swimming.
People are also reminded to always wash their hands with soap and water, and thoroughly shower after swimming, tubing or skiing in area lakes to reduce chances of contracting a waterborne illness.