Wessler Engineering is a civil and environmental engineering firm based in Indianapolis that specializes in wastewater, drinking water and stormwater projects. The Indiana Department of Environmental Management (IDEM) issued the Municipal Separate Storm Sewer System (MS4) General Permit in December 2021. The permit identified new requirements for entities that have been designated as MS4s in Indiana to fulfill during their permit term of 5 years. The General Permit has requirements within 6 Minimum Control Measures (MCMs) that each MS4 program must address.

The Wabash River is on Indiana’s 303(d) List of Impaired Waters and a TMDL (total maximum daily load) study found that the waterway is impaired for nutrients. The objective of this project is to develop an MS4 Program to address the impairments present in the Wabash River. This evaluation shall include developing tasks for each MCM.