(a) The county government may establish or extend 1 or more county sewage disposal districts and county sanitary districts in the manner hereinafter provided for the purpose of the collection, transmission, treatment, and disposal of sewage.
(b) A county district established or extended hereunder may consist of 2 or more noncontiguous areas.
(c) Sanitary districts may only be established or extended within the boundaries of a sewage disposal district.