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Best Management Practices
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