D.C. Mun. Regs. tit. 6, r. 6-B213
All job postings shall inform District candidates of their eligibility for any applicable residential hiring preference. Such job postings shall also inform candidates of the requirement to remain a District resident for seven (7) years if selected exercising the preference.
A District resident who claims residency preference shall be awarded a ten (10)-point hiring preference. The candidate must be a District resident at the time of application to claim preference.
Applicants who claim residency preference must certify that they are residents of the District and agree, in writing, to maintain residency for a period of seven (7) consecutive years from the date they are hired into the District government notwithstanding any subsequent details, reassignments, transfers, promotions, demotions, or any other internal movement.
Applicants who claimed residency preference shall furnish proof of residency in a manner prescribed by the personnel authority.
D.C. Mun. Regs. tit. 6, r. 6-B213