The Brief The Milwaukee Metropolitan Sewerage District seeks a permit renewal from the Department of Natural Resources. The Milwaukee Metropolitan Sewerage District is looking to renew its permit with the Department of Natural Resources. In addition to the Milwaukee Metropolitan Sewerage District executive director speaking, a representative from Common Ground also gave input. Common Ground is a nonprofit comprised of more than 40 organizations and pursues social issues. Common Ground is also asking for the DNR to inspect MMSD's facilities on a semi-annual basis.