Polluted stormwater runoff is often transported to through storm sewer systems and ultimately discharged into local rivers and streams without treatment. The federal Clean Water Act, through the development of national stormwater regulations, establishes a stormwater management program for certain storm sewer systems. This program is intended to improve surface water quality by reducing the quantity of pollutants that stormwater picks up and carries into storm sewer systems during storm events.
Common pollutants include oil and grease from roadways and parking lots, pesticides from lawns, sediment from construction sites, and carelessly discarded trash, such as cigarette butts, paper wrappers, pet waste, and plastic bottles.
For more information on what MS4s are and who needs coverage under an MS4 permit, please refer to the linked document. For additional questions please contact the Stormwater Team at 1-800-737-8676 or firstname.lastname@example.org