D.C. Code § 42-3505.54: Notice of tenant's intent to vacate after the expiration of the signed lease term, renewal or extension term.

(a)

A residential tenancy from month-to-month may be terminated by a 30-day notice in writing only from the tenant to the housing provider of the tenant's intention to quit. The notice shall expire on the first day of the first month at least 30 days after the date of the notice.

(b)

A housing provider shall not place or cause to be placed in a residential lease or rental agreement a requirement that the tenant provide more than a 30-day notice to the housing provider of the tenant's intention to vacate the premises, unless the lease or agreement also requires the housing provider to provide the tenant with a written notice of any rent increase that is at least 30 days more than that time period.