1. Except as otherwise provided by law, the department has the exclusive authority to adopt rules regarding licensing, permitting, and inspections of onsite wastewater treatment systems.

2. The department shall provide technical assistance and guidance to municipalities and local public health units on all matters related to onsite wastewater treatment systems.

3. An ordinance enacted or adopted by a county or city in accordance with a home rule charter, or an ordinance enacted or adopted by any other political subdivision, in conflict with a rule adopted under this section is void.