Where the subdivision contains sewers, sewage treatment plants, water supply systems, or other physical facilities that are necessary or desirable for the welfare of the area or that are of common use or benefit and which are not or cannot be satisfactorily maintained by an existing public agency; provision shall be made which is acceptable to the agency having jurisdiction over the location and maintenance of such facilities for the proper and continuous operation, maintenance and supervision of such facilities. (Res. 901, 5-10-1977)