D.C. Code § 41-152.04

(a) Subject to § 41-152.10 , property held in an account established under §§ 21-301 to 21-324 , or another state's Uniform Gifts to Minors Act or Uniform Transfers to Minors Act, is presumed abandoned if it is unclaimed by or on behalf of the minor on whose behalf the account was opened 3 years after the later of:
(1) Except as otherwise provided in paragraph (2) of this subsection, the date a second consecutive communication sent by the holder by first-class United States mail to the custodian of the minor on whose behalf the account was opened is returned undelivered to the holder by the United States Postal Service;
(2) If the second communication is sent later than 30 days after the date the first communication is returned undelivered, the date the first communication was returned undelivered; or
(3) The date on which the custodian is required to transfer the property to the minor or the minor's estate in accordance with the Uniform Gifts to Minors Act or Uniform Transfers to Minors Act of the state in which the account was opened.
(b) If the holder does not send communications to the custodian of the minor on whose behalf an account described in subsection (a) of this section was opened by first-class United States mail, the holder shall attempt to confirm the custodian's interest in the property by sending the custodian an electronic-mail communication not later than 2 years after the custodian's last indication of interest in the property. However, the holder promptly shall attempt to contact the custodian by first-class United States mail if:
(1) The holder does not have information needed to send the custodian an electronic mail communication or the holder believes that the custodian's electronic-mail-mail address in the holder's records is not valid;
(2) The holder receives notification that the electronic-mail communication was not received; or
(3) The custodian does not respond to the electronic-mail communication not later than 30 days after the communication was sent.
eded to send the custodian an electronic mail communication or the holder believes that the custodian's electronic-mail-mail address in the holder's records is not valid;
(2) The holder receives notification that the electronic-mail communication was not received; or
(3) The custodian does not respond to the electronic-mail communication not later than 30 days after the communication was sent.
(c) If first-class United States mail sent under subsection (b) of this section is returned undelivered to the holder by the United States Postal Service, the property is presumed abandoned 3 years after the later of:
(1) The date a second consecutive communication to contact the custodian by first-class United States mail is returned to the holder undelivered by the United States Postal Service; or
(2) The date established by subsection (a)(3) of this section.
(d) When the property in the account described in subsection (a) of this section is transferred to the minor on whose behalf an account was opened or to the minor's estate, the property in the account is no longer subject to this section.