D.C. Mun. Regs. tit. 3, § 517
517.1
Prior to the thirtieth (30th) day preceding a primary election, a registered voter may give notice of change of party affiliation status by:
(a) Completing a change of party affiliation status on a Voter Registration Application;
(b) Filing a change of party affiliation status by signed letter or postal card which includes the following information;
(1) The voter's name;
(2) Former and new party affiliation status;
(3) Address; and
(4) Date of birth.
(c) Filing a change of party affiliation status through the DMV or a voter registration agency pursuant to D.C. Official Code § 1-1001.07(d) (2006 Repl.); or
(d) Completing any other form prescribed for this purpose by the Board.
517.2
The effective date of any change of party affiliation status shall be the date that the notice is considered to be received by the Board; except that, no change of party affiliation status shall be effective if postmarked or considered received during the thirty (30) day period that immediately precedes any election. Requests for changes to a political party affiliation status considered received during the thirty (30) days that immediately precede and include the date of the primary election shall be held and processed after the election. A change in party affiliation status occurs when a voter:
(a) Changes his or her party registration from one political party to another;
(b) Changes his or her party registration from "No Party (Independent)" to a political party;
(c) Changes his or her party registration from a political party to "No Party (Independent)."
SOURCE: Final Rulemaking published at 43 D.C. Reg. 1078, 1091-92 (March 1, 1996); as amended by Final Rulemaking published at 57 D.C. Reg. 3267, 3286 (April 16, 2010); as amended by Notice of Emergency and Proposed Rulemaking published at 7 DCR 7690 (August 20, 2010)[EXPIRED]; as amended by Notice of Final Rulemaking published at 57 DCR 11111, 11121(November 26, 2010).