General information to help you prepare, not legal, environmental or inspection advice. Michigan has no statewide septic code, so rules vary by county and township and can change. Confirm requirements with the local health department and township, and hire licensed inspectors. Sources: Michigan Department of Health and Human Services; Michigan EGLE; Michigan Lake Stewardship Associations; Michigan Farm Bureau. MDHHS can explain well test results: 800-648-6942.