Except for an area off the Ga. 53/Dawsonville Highway bridge in Gainesville over the Chattahoochee River, Lake Lanier met water quality standards in 2013. The testing station at the bridge showed 10.6 parts per billion of chlorophyll-a, which indicates the level of potentially harmful algae growth, exceeding the standard of 10 parts per billion, according to data collected by Chattahoochee Riverkeeper, an Atlanta-based environmental watchdog group. An average of monthly results from five locations on Lanier also showed water quality violations at Buford Dam.