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You are here: Home / Permitting / Stormwater Permits / Storm Water Navigation / Stormwater and Municipal Separate Storm Sewer Systems (MS4s)

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 and steps necessary to obtain authorization for stormwater discharges from small MS4s.
Storm Water Permitting Requirements for Medium and Large (Phase I ) MS4s
Explains the requirements and steps for applying for a permit to authorize storm water discharges from Phase I (medium and large) MS4s as well as annual reporting and discharge monitoring report requirements.
Storm Water 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 1 from MS4 Permitting Requirements (Small Systems Only)
Explains the waiver from the permitting requirement available to small MS4s that serve a population of less than 1,000.
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.