Each county commission shall conduct a study of all public service districts which have their principal offices within its county and shall develop a plan relating to the creation, consolidation, merger, expansion or dissolution of such districts or the consolidation or merger of management and administrative services and personnel and shall present such plan to the Public Service Commission for approval, disapproval, or modification: Provided, That within ninety days of the effective date of this section each county commission in this state shall elect either to perform its own study or request that the Public Service Commission perform such study. Each county commission electing to perform its own study has one year from the date of election to present such plan to the Public Service Commission. For each county wherein the county commission elects not to perform its own study, the Public Service Commission shall conduct a study of such county. The Public Service Commission shall establish a schedule for such studies upon a priority basis, with those counties perceived to have the greatest need of creation or consolidation of public service districts receiving the highest priority. In establishing the priority schedule, and in the performance of each study, the bureau of public health and the Division of Environmental Protection shall offer their assistance and cooperation to the Public Service Commission. Upon completion by the Public Service Commission of each study, it shall be submitted to the appropriate county commission for review and comment. Each county commission has six months in which to review the study conducted by the Public Service Commission, suggest changes or modifications thereof, and present such plan to the Public Service Commission. All county plans, whether conducted by the county commission itself or submitted as a result of a Public Service Commission study, shall, by order, be approved, disapproved or modified by the Public Service Commission in accordance with rules promulgated by the Public Service Commission and such order shall be implemented by the county commission.