Rule 428. Sewage and other water-carried wastes shall be disposed of through a municipal sewer system where such a system is available. Where a municipal sewer connection is not available, liquid waste shall be discharged into an approved private system. The private system shall not create a nuisance or pollute a stream, lake, or other body of water or contaminate a water supply or bathing place and shall comply with applicable local health department requirements.
Mich. Admin. Code R. 400.4428