D.C. Mun. Regs. tit. 25-D, § 908
908.1 Except as specified in section 908.2, refuse receptacles not meeting the requirements specified in section 903, such as receptacles that are not rodent-resistant, unprotected plastic bags and paper bags shall not be stored outside.
908.2 Cardboard or other packaging material that awaiting regularly scheduled delivery to a recycling or disposal site may be stored outside without being in a covered receptacle if it is stored so that it does not create a rodent harborage problem.
Source: Final Rulemaking published at 56 DCR 7975 (October 9, 2009).