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Stormwater and Municipal Separate Storm Sewer Systems (MS4s)

Permits required for the discharge of stormwater from small, medium, and large systems. Phase I and Phase II requirements. Waivers for qualified small systems.

Topics Under this Category

General Permit TXR040000 for Phase II (Small) MS4s
Requirements for obtaining authorization for stormwater discharges from small MS4s, the new General Permit, forms and annual reporting.
Stormwater Permitting Requirements for Medium and Large (Phase I ) 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.
Stormwater Permitting Requirements for Phase II (Small) MS4s
Authorization options, control measures required, annual reporting requirements, and links to best management practices for operators of Phase II MS4s.
Waiver Option 2 from MS4 Permitting Requirements (Small Systems Only)
Explains the waiver from the permitting requirement available to small MS4s which serve a population of less than 10,000.