The Greater Peoria Sanitary District collects the wastewater of the District (domestic and industrial) and conveys that wastewater to a facility for treatment in accordance with the laws and regulations of the State of Illinois and the United States Environmental Protection Agency. The District currently serves an area of approximately 66 square miles and treats wastewater collected from 716 miles of sewer. Municipalities served include Peoria, Peoria Heights, Bartonville, West Peoria and Bellevue, plus adjacent unincorporated areas. An industrial area located near Mapleton is also served by agreement.