We often get questions about the applicability and differences between several stormwater related permits and associated plans regulated by the U.S. Environmental Protection Agency, specifically, the Industrial Multi-Sector General Permit (MSGP), the Construction General Permit (CGP), the Spill Prevention Control and Countermeasures (SPCC) Rules, and the Small Municipal Storm Sewer System (MS4) Permit. Although all have to do with stormwater in one capacity or another, some apply to a specific facility while others apply to a community’s drainage system.