This summer we had cyanobacteria (blue green algae) show up in one of our flood control lakes. These lakes are private property with the exception of Bear Creek. (Bear Creek Park Area) 
It is advised to not swim, wade or come in contact with the water if you notice any discoloration, scum, foam, or algae. Recreational waters containing Microcystins at levels exceeding the EPA's guidelines for issuing a health advisory can put you, and your pets, at risk of various adverse health effects. 
 
Bear Creek Lake is a flood control pond and is not regulated by the state or the county: samples were taken due to the public recreation at the park. It is advised to seek a pond or lake management company for advice and information on how to maintain and mitigate algal blooms on the flood control lakes. 
 
For information on pond maintenance please refer to:
 
https://www.clemson.edu/extension/water/stormwater-ponds/resources/final_binder_pond_maintenance.pdf 
 
https://www.scdhec.gov/sites/default/files/Library/CR-012671.pdf