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.
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Municipal Separate Storm Sewer System (MS4) Discharges: Am I Regulated?
Explains which MS4s are required to obtain permit coverage for their storm water discharges.
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General Permit TXR040000 for Phase II (Small) MS4s
Requirements and steps necessary to obtain authorization for stormwater discharges from small MS4s.
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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.
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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.
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Waiver Option 1 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 1,000.
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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.
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