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Line 5: permit review timeline

For more information on the permits covered by each of the timelines, visit the Line 5 applicable permits page. 

 NPDES permits timeline 

  • June 30, 2026: Public notice period for reissuance of permit ended
  • May, 19, 2026: Public notice period for reissuance of permit started
  • September 19, 2025: The application was determined to be administratively complete
  • August 21, 2025: additional information regarding the permit application was requested by EGLE
  • July 17, 2025: Enbridge submitted some of the additional permit application information requested by EGLE
  • July 3, 2025: additional information regarding the permit application was requested by EGLE
  • May 19, 2025: Enbridge submitted some of the additional permit application information requested by EGLE
  • April 29, 2025: additional information regarding the permit application was requested by EGLE
  • March 24, 2025: Enbridge submitted some of the additional permit application information requested by EGLE
  • February 28, 2025: additional information regarding the permit application was requested by EGLE
  • February 14, 2025: NPDES application for permit reissuance was internally reviewed by EGLE staff
  • February 13, 2025: NPDES application for permit reissuance received

 Resources permit timeline

  • July 15, 2026: EGLE issues resource permit for proposed Mackinac Straits Tunnel
  • August 29, 2025: Public notice period concluded
  • July 16, 2025: Public notice period started
  • July 8, 2025: EGLE’s Water Resource Division received Revision 5 of the Joint Permit Application  (JPA) from Enbridge
  • March 17, 2025: Correction requests were sent via MiEnviro Portal and email to the applicant by EGLE requesting additional information.
  • March 3, 2025: Resources permit application received under submission HQ3-8BYB-N9DT1 and EGLE staff began reviewing the application for completeness.
  • Michigan Public Service Commission

    Michigan Public Service Commission on Line 5

  • Straits of Mackinac - aerial view

    Find the latest updates on the Line 5 homepage

    Information on the Line 5 tunnel project proposal by Enbridge, including overview, timelines, recent permit documents and decisions, and more.

    Go to Line 5 home