Under the general permit, small MS4s must develop, implement and enforce a program that includes the following "six minimum control measures":
- Public education and outreach on stormwater impacts
- Public involvement and participation
- Illicit discharge detection and elimination
- Construction site stormwater runoff control
- Post-construction stormwater management in new development and redevelopment
- Pollution prevention/good housekeeping for municipal operations
Municipal Separate Storm Sewer Systems (MS4) Permits