What Are the Phase 2 Small MS4 Program requirements?

Operators of regulated small MS4s are required to design their programs to:

  • Reduce the discharge of pollutants to the Maximum Extent Practicable (MEP)
  • Protect water quality
  • Satisfy the appropriate water quality requirements of the Clean Water Act

Implementation will typically require the development and implementation of Best Management Practices and the achievement of measurable goals to satisfy each of the six minimum control measures.

  1. Public Education, Outreach, and Involvement
  2. Illicit Discharge Detection and Elimination
  3. Construction Site Stormwater Runoff Control
  4. Post-Construction Stormwater Management in New Development and Redevelopment
  5. Pollution Prevention/Good Housekeeping for Municipal Operations
  6. Industrial Stormwater Sources (if serves population more than 100,000)

Additional information on our construction site stormwater and industrial site stormwater programs can be found on our Business Watershed Protection webpage.

Show All Answers

1. What is a watershed?
2. Why is watershed protection important?
3. How do I report a spill or discharge impacting a waterway?
4. Where should I drain the water from my pool?
5. Where can I discharge pool filter backwash water?
6. Where can I find out more about Environmentally Sensitive Areas?
7. What is a Stormwater Management Plan?
8. What Is a Phase 2 Small Municipal Separate Storm Sewer Systems (MS4)?
9. What Are the Phase 2 Small MS4 Program requirements?
10. What is an illicit discharge?
11. What is required of an illicit discharge detection and elimination program?
12. What is Municipal Good Housekeeping?
13. What is required of Municipal Good Housekeeping?
14. What is Integrated Stormwater Management (ISWM)?