D.C. Mun. Regs. tit. 3, § 1003
1003.1 An initiative or referendum petition shall be signed by registered voters equal in number to five percent (5%) of the registered qualified electors of the District of Columbia, provided that the total signatures submitted include five percent (5%) of the registered qualified electors in each of five (5) or more of the eight (8) election wards.
1003.2 The number of registered qualified electors used for computing the signature requirements shall be based upon the latest official count of registered qualified electors made by the Board that was issued at least thirty (30) days prior to submission of the signatures for the particular initiative or referendum petition.
SOURCE: Final Rulemaking published at 43 DCR 103 (January 12, 1996); as amended by Final Rulemaking published at 47 DCR 6977 (August 27, 1999); as amended by Final Rulemaking published at 60 DCR 5582 (April 12, 2013); as amended by Final Rulemaking published at 61 DCR 625 (January 24, 2014).