The Iowa Department of Natural Resources is the state agency that provides the permit for wastewater management and discharge. The permit is a granted to the Iowa Great Lakes Sanitary District every five years. The last permit renewal was in 2015. The requirements of that permit can be found on the DNR website, the Iowa Great Lakes Sanitary District permit number is #30-50-9-01. To learn more about the permitting process, visit the Iowa DNR NPDES Wastewater Permitting site.
The permit has been amended twice.