The Environmental Services Division oversees the City's Stormwater Program. Stormwater management is a state and federally mandated program requiring the City to obtain an MS4 Permit for the discharge of stormwater and meet        several permit requirements. The goal of the MS4 program is to mitigate pollution that enters our waterways through storm sewer systems. The following program areas have been implemented by the City of Sioux City and work to            reduce pollution. 

• Public outreach & education on stormwater impacts
• Public involvement and participation
• Illicit discharge detection & elimination program
• Construction site regulations on stormwater discharge
• Post-construction stormwater management
• Best management practices in municipal operations

What is an MS4?

MS4 stands for "municipal separate storm sewer system" and refers  to the City's system of stormwater conveyances such as roads, streets, catch basins, curbs, gutters, ditches, man-made     channels, storm drains, etc. There are 43 MS4 cities in Iowa, all of which are required to obtain a general permit from   the Iowa Department of natural resources for the discharge of stormwater.