Rule 172. If a storage reservoir is used in a water supply system, plans for the storage reservoir installation shall be submitted to the health officer and approval obtained before installation of the reservoir. A storage reservoir shall be constructed of materials approved by the department and shall be designed, operated, and maintained in a manner to prevent the entrance of contaminants. For the purposes of this rule, a storage reservoir does not include a pressure tank.
Mich. Admin. Code R. 325.1672