Section 254 - Public hearing; cost to typical property1. When the agency has caused such maps and plans to be prepared, it shall transmit them to the board of supervisors, together with a report of its proceedings and its recommendations, including a recommendation as to what officer, board or body should be the administrative head or body of the proposed district. Such report may further include the recommendations relating to the establishment of two or more zones of assessment within the proposed district and the estimated initial allocation of the cost of the construction of the facilities as between such zones to be assessed, levied and collected in each zone in the same manner and at the same time as other county charges. Upon receipt of the report and the maps and plans, the board of supervisors shall call a public hearing upon a proposal to establish a county district, to comprise the area or areas described and defined in said maps and plans. No public hearing shall be called to establish a water quality treatment district until the maps and plans have been submitted to and approved in writing by the state department of health. Copy of such notice of approval or denial of the maps and plans shall be filed in the office of the clerk of the board of supervisors of the county in which the proposed district is located. The clerk of the board of supervisors shall cause a notice of the public hearing to be published at least once in the official newspapers of the county and in such other newspapers having a general circulation in the proposed district as the board may direct, the first publications thereof to be not less than ten or more than twenty days before the day set therein for the hearing. The notice of hearing shall contain a description of the area or areas to be included within the proposed district, and if the report shall have recommended the establishment of zones of assessment, a description of the area or areas to be included within each zone of assessment, the improvements proposed, the maximum amount to be expended for the improvement, the estimated cost of hook-up fees, if any, to, and the cost of the district or extension to, the typical property and, if different, the typical one or two family home, the allocation of such maximum amount as between the zones of assessment recommended, if any, the proposed method of assessment of the cost and shall specify the time when and place where the board of supervisors will meet to consider the matter and to hear all parties interested therein concerning the same. In the event that zones of assessment are provided for and an allocation of cost of the facilities between such zones of assessment, said notice shall further state that said zones of assessment and said allocations of cost may be changed from time to time by resolution of the board of supervisors adopted after a public hearing whenever said board of supervisors shall determine that such changes are necessary in the public interest. Prior to the publication of the notice of hearing, the board of supervisors shall cause to be prepared, and file for public inspection with the county clerk, a detailed explanation of how the estimated cost of hook-up fees, if any, to, and the cost of the district or extension to, the typical property and, if different, the typical one or two family home was computed.2.(a) If the permission of the state comptroller is not required pursuant to section two hundred fifty-eight, two hundred sixty-eight or two hundred sixty-nine of this article because it is proposed or required that the county in in which the district is located shall finance the proposed cost by the issuance of bonds, notes, certificates, or other evidences of indebtedness of the county therefor or shall assume the payment of annual installments of debt service on obligations issued to finance the cost of facilities pursuant to section two hundred sixty-two of this article but the cost to typical property or, if different, the cost to the typical one or two family home is not above the average cost threshold described in those sections, a certified copy of the notice of hearing shall also be filed with the state comptroller on or about the date of publication of the notice.(b) Notwithstanding the provisions of paragraph (a) of this subdivision, the state comptroller shall not be precluded from requiring the submission of additional information or data in such form and detail as the state comptroller shall deem sufficient or from causing an investigation to be made with respect to the establishment or extension of a district or an increase in the maximum amount to be expended.