IEPA Annual Facility Inspection Report for NPDES Permit for Storm Water Discharge from Separate Storm Sewer Systems (MS4)

The NPDES Phase II Annual Update Year 19 (2021-2022) includes information on changes to best management practices, status of compliance, information, date results and summary of proposed year stormwater activities.  

The NPDES Permit for Storm Water Discharge from Separate Storm Sewer Systems (MS4) is being published as of June 1, 2022.