Subdivision Sec.8-26b.

Whenever a subdivision of land is planned, the area of which will abut or include land in two or more municipalities one or both of which are within a region or regions having a regional planning agency or agencies, the planning commission . . . shall, before approving the plan, give written notice of such subdivision plan to the regional planning agency or agencies of the region in which it or the other municipality is located. Such notice shall be made by certified mail, return receipt requested not later than thirty days before the public hearing to be held in relation thereto. A regional planning agency receiving such notice shall, at or before the hearing report to each such planning commission and to the proponent of such subdivision on its findings on the intermunicipal aspects of the proposed subdivision, including street layout, storm drainage, sewer and water service and such other matters as it considers appropriate. If such report of a regional planning agency is not submitted, at or before the hearing, it shall be presumed that such agency does not disapprove of the proposed subdivision. . . . The report of such regional planning agency shall be purely advisory.