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NPDES Stormwater Program for Medium and Large MS4s
The Stormwater Phase I Rule (55 FR 47990; November 16, 1990) requires all operators of medium and large municipal separate storm sewer systems (MS4s) to:
- Obtain a National Pollutant Discharge Elimination System (NPDES) permit, and
- Develop a stormwater management program designed to prevent harmful pollutants from being washed by stormwater runoff into the MS4 (or from being dumped directly into the MS4), then discharged from the MS4 into local waterbodies.
The following pages provide specific information related to requirements for medium and large MS4s:
- Who's Covered: Identifies operators of medium and large MS4s regulated by Phase I of the NPDES Stormwater Program.
- Permit Application Requirements: Includes a summary of the comprehensive permit application and program requirements for operators of medium and large MS4s.
- MS4 Permit Status: A downloadable list of the almost 1,000 current Phase I MS4 permittees nationwide, as well as examples of issued MS4 permits.
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