The Pole Bridge Wastewater Treatment Plant, located in southeast DeKalb County, has a capacity of 20 million gallons per day (MGD). The biosolids produced by the treatment process are disposed of on an adjoining land application site. In 1993, Federal regulations were revised to establish new criteria for sludge digestion prior to land application. The existing aerobic digesters met the new standards up to 6-8 MGD. Construction of additional aerobic digester capacity began in February 2001 and was completed in 2002 at a cost of $12.5 million.