D.C. Mun. Regs. tit. 14, § 4301
4301.1 If a housing provider seeks to recover possession of a rental unit on the grounds that the tenant is violating an obligation of the tenancy, the housing provider shall first serve the tenant with a notice to correct the violation or to vacate.
4301.2 The notice shall provide at least thirty (30) days for correction of the violation and shall specify what actions need to be taken by the tenant to avoid an eviction.
4301.3 The notice to correct the violation or to vacate may state that the housing provider may evict if the violations are uncorrected at the conclusion of the thirty (30) day notice period.
4301.4 Violations of an obligation of tenancy refer only to those obligations which are contained in a valid, written lease or in the D.C. Housing Code, and where the violations are alleged to have occurred no more than six (6) months prior to the issuance of the notice to correct the violation or vacate.
SOURCE: Notice of Final Rulemaking published at 33 DCR 1336, 1419 (March 7, 1986); as amended by Notice of Final Rulemaking published at 33 DCR 2656, 2669 (May 2, 1986).