D.C. Mun. Regs. tit. 19, r. 19-1501
Any person fishing in the waters of the District of Columbia, including Rock Creek Park and all other fishable waters within the District of Columbia, regardless of whether the person is fishing from the Virginia shoreline or from National Park lands, is required by law to possess a valid D.C. Fishing License.
The following persons shall be exempt from the licensing requirements of section 1501.1:
A licensed angler shall prominently display the license at all times while fishing and shall allow inspection of the license by any conservation or law enforcement officer upon request.
A scientific collection permit shall be required for scientific collection of fish or other aquatic organisms from District waters.
Angling licenses shall be current for the period from January 1 to December 31, of the calendar year marked on the license.
A person desiring an angler's license or a scientific collection permit shall file an application with the Director on a form prescribed by the Director.
The provisions of section 1501.1 shall not apply during National Fishing Week.
D.C. Mun. Regs. tit. 19, r. 19-1501