Litter Can Installation DPW installs litter cans as needed based on Solid Waste Management Division investigation. Installation is based on the location of other cans and the amount of pedestrian traffic. The Solid Waste Management Division investigates all written litter can installation requests. To request the installation of a new litter can, call the Citywide Call Center on 311. Written requests may be sent to: DPW SWMA 2750 S. Capitol Street, SE Washington, DC 20032 Hours of Operation 6:30 am - 3:15 pm, Monday through Friday We Will Investigate Within 10 days We Will Resolve Within 2 weeks - 9 months Holiday Schedule DPW is closed on all government holidays. To Request Services Call the Mayor's Citywide Call Center at 311. Service Request Center