Stormwater and Municipal Separate Storm Sewer Systems (MS4s)
Explains which MS4s are required to obtain permit coverage for their storm water discharges.
Topics Under this Category
Requirements and steps necessary to obtain authorization for stormwater discharges from small MS4s.
Explains the requirements and steps for applying for a permit to authorize stormwater discharges from Phase I (medium and large) MS4s as well as annual reporting and discharge monitoring report requirements.
Authorization options, control measures required, annual reporting requirements, and links to best management practices for operators of Phase II MS4s.
Explains the waiver from the permitting requirement available to small MS4s that serve a population of less than 1,000.
Explains the waiver from the permitting requirement available to small MS4s which serve a population of less than 10,000.