N.Y. County Law § 251: County agency

§ 251. County agency. The board of supervisors may appoint or

establish an officer, board or body, or may designate an existing

officer, board or body, or public authority which possesses the express

power to act as such an agency, to act as a county water, water quality

treatment, sewer, wastewater disposal, drainage, refuse or public inland

lake protection and rehabilitation agency (hereinafter referred to in

this article as the "agency") having the powers hereinafter prescribed

in sections two hundred fifty-two, two hundred fifty-three and two

hundred fifty-four, and such other powers and duties as the board of

supervisors may determine necessary to carry into effect the provisions

of this article. Except in the case of a public authority, the agency

may also be designated as the administrative head or body of any county

district which may be established pursuant to the provisions of this

article. All matters relating to the membership of such agency,

including, but not limited to, numbers, method of selection, tenure,

qualifications and compensation, shall be determined by the board of

supervisors.