D.C. Mun. Regs. tit. 3, § 511
511.1 Within nineteen (19) calendar days after the receipt of a registration application form, the Board shall mail a non-forwardable voter registration notification to the applicant advising him or her of the acceptance or rejection of the registration application by its chief voter registration official.
511.2 If the application is rejected, the notification shall include the reason or reasons for the rejection and shall inform the voter of his or her right to appeal the rejection pursuant to D.C. Code § 1-1001.07(f) (2006 Repl.).
511.3 In the event that the notification advising the applicant of acceptance of his or her voter registration is returned to the Board as undeliverable, the Board shall mail the notice provided in D.C. Code § 1-1001.07 (j)(1)(B) (2006 Repl.).
511.4 The registration shall be effective on the date the Board determines that the applicant is a qualified elector and eligible to register to vote in the District of Columbia.
SOURCE: Final Rulemaking published at 43 D.C. Reg. 1078, 1087 (March 1, 1996).