The county shall recognize the design of water, reclaimed water and sewer facilities
prepared by a registered professional engineer regularly engaged in the field of sanitary
engineering, covering the design of the developer's on-site water distribution and
sewage collection system; provided, however, that each such design shall be fully
subject to the approval of the utilities engineer and shall conform in all respects
to county criteria, for the facilities ultimately to be accepted by the county for
ownership, operation and maintenance.