The Iowa Department of Natural Resources is the state agency that has oversight on the Private Sewage Disposal System rules in the state of Iowa.
In Iowa, local boards of health have primary responsibility for regulation of private sewage disposal systems (also known as onsite wastewater treatment systems) serving 4 homes or fewer or less than 15 people, while the Iowa DNR has primary responsibility for larger (public) systems. In conducting their activities, counties must comply with the minimum state standards developed by the Iowa DNR. If counties fail to adopt or enforce state standards for smaller systems, the Iowa DNR has concurrent authority to require compliance with the minimum standards for onsite wastewater treatment and disposal.
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