N.Y. Envtl. Conserv. Law § 15-0907
Whenever this article provides for or authorizes the service of a notice, order or direction upon a licensee or applicant for a license, or upon any other person, and does not provide for the manner of service, and no different time is provided, such service may be made either personally or in the manner provided by law for the service of a summons or by mailing a copy of the same by registered mail in a postpaid wrapper addressed to the licensee or applicant, or any other person, at the address given in the application or as subsequently communicated to the department in writing, or at the project works. Such service may be made upon a municipal corporation either personally as above provided or by mailing a copy of the same in like manner addressed to the mayor of the city or village or the supervisor of the town. Service upon unknown owners shall be made by publication in the manner provided by law for service of a summons upon unknown parties.
N.Y. Envtl. Conserv. Law § 15-0907