Many communities in Michigan, including Orion Township, are required to have a stormwater permit from the Michigan Department of Environment, Great Lakes and Energy (EGLE). This requirement is part of the Federal Clean Water Act and is referred to as the Phase II Municipal Separate Storm Sewer System (MS4) stormwater discharge permit. An MS4 is a system of drainage (including roads, storm drains, pipes, and ditches, etc.) that is not a combined sewer or part of a sewage treatment plant. During wet weather, pollutants are transported through MS4s to local water bodies. The goal of the MS4 program is to reduce the discharge of pollutants to surface waters of the State.
