. . . . . . . . . . . . . "[t]he authority to perform at the county level any function or service not prohibited by law, which shall include, by way of enumeration and not limitation: Police protection, fire protection, planning, zoning, education, health, welfare, recreation, water, sewer, waste disposal, transportation, abatement of air and water pollution, civil defense, and any other function or service necessary or ben" . . . . . . . . .