N.Y. County Law § 260
Any interested party, including a city or village, or a town board or board of commissioners on behalf of a district, aggrieved by the final determination or order made by the board of supervisors establishing the district or authorizing the increase and improvement of facilities previously authorized for an existing district, may make application for review of any and all of the final determinations made by the board of supervisors in connection with the proceeding establishing the district or authorizing the increase and improvement of facilities previously authorized for an existing district in the manner provided in article seventy-eight of the civil practice law and rules provided that application for review is made within thirty days from the date of the recording of the order establishing the district or authorizing the increase and improvement of facilities previously authorized for an existing district in the office of the clerk of the county. Unless such application is made within thirty days as aforesaid, the order establishing the district or authorizing the increase and improvement of facilities previously authorized for an existing district shall be final and conclusive. In the event that upon such review there shall be any modification by the court of such final determination or order, the clerk of the board of supervisors shall cause such order to be recorded and certified copies thereof filed in the same places as was the determination or order appealed from.
N.Y. CountyLaw § 260