The Division of Sewerage and Drainage operates two wastewater treatment plants, Jackson Pike and Southerly. Wastewater from Columbus and 22 contracting suburban communities flows to one of these two plants, who combined treated an average of 208 million gallons per day in 2011, a year with record rainfall of 54.96". The photo to the right shows the sludge digesters at Jackson Pike, which are visible from I-71 south of downtown Columbus.
Two following two Adobe Acrobat PDF files explain the treatment process used at both plants:
Other statistics on wastewater treatment in Columbus can be found in our most recent Department of Public Utilities Annual Report.