N.Y. Comp. Codes R. & Regs. tit. 9, § 6217.10
(2) The list maintenance performed shall be conducted in a manner consistent with the Election Law and these regulations to ensure that:
(iii) the prior registrations of duplicate names are removed from such list.
(b) Notices of cancellation.
(2) The county board shall electronically file with the State Board a cancellation and removal report indicating all cancellations and removal actions taken by the local Board of Elections from the list of eligible voters. Such report shall be filed in a format and at such intervals as directed by the State Board.
(c) Address, name and enrollment changes within a county.
(1) When a review and query of a voter registration application indicates that the voter is already registered to vote within the county, and is initiating a change to their record, such change shall be processed, and the record updated and the appropriate notice shall be sent to the voter:
(2) Before an update or change can be applied to an existing voter registration record, a county board shall perform a search of existing voters to ensure that the application is not a new registration and is an update or change to an existing record within the county.
(d) Notifications of a death, felony conviction or adjudication of mental incompetence.
(3) Each local Board of Elections shall, within 25 days after receiving such list of decedents or list of persons subject to forfeiture of the right to vote pursuant to section 5-106 of the Election Law, use such lists to identify and remove decedents and persons subject to forfeiture of the right to vote pursuant to section 5-106 of this article from the list of eligible voters.
(e) National change of address.
National change of address processing shall be conducted with a United States Postal Service approved vendor at least annually. The processing shall at a minimum identify voter address change information, whether permanent or temporary; provide data which can be used to standardize addresses and provide enhanced ZIP code extensions, to assist in more accurate delivery of voter mail; and notification of deceased status. Notifications shall be sent to the appropriate county for follow-up and determination.
(a) List maintenance activities and schedules.