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 for obtaining authorization for stormwater discharges from small MS4s, the new General Permit, forms and annual reporting.
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 which serve a population of less than 10,000.