D.C. Mun. Regs. tit. 19, r. 19-1005
A person whose name appears as the owner of a vessel on a Certificate of Number shall surrender the certificate to the Harbor Master within fifteen (15) days after the certificate becomes invalid.
A Certificate of Number issued by the Harbor Master shall be invalid if the application for the Certificate of Number contains a false or fraudulent statement, or if the annual fees required by § 1002.13 have not been paid.
A Certificate of Number which has not expired shall be invalid after the date on which the person whose name appears as the owner of the vessel on such Certificate of Number transfers all of his or her ownership in the vessel, or when the vessel is destroyed or abandoned.
A Certificate of Number is invalid fifty (50) days after the date on which the vessel is no longer principally used in the District of Columbia waters.
A Certificate of Number shall be invalid when the person whose name appears on the Certificate as the owner involuntarily loses his or her interest in the vessel by legal process.
A Certificate of Number shall be invalid after the date upon which the vessel is documented or required to be documented under 45 CFR § 67.
The person whose name appears as the owner of a vessel on the Certificate of Number shall remove the identification number displayed on the vessel and the validation stickers whenever the Certificate of Number expires or becomes invalid.
If the vessel is re-registered in the District, the identification number assigned to the vessel may be identical to the previously assigned identification number.
D.C. Mun. Regs. tit. 19, r. 19-1005