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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.
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Straits of Mackinac - aerial view
Find the latest updates on the Line 5 homepage
Go to Line 5 homeInformation on the Line 5 tunnel project proposal by Enbridge, including overview, timelines, recent permit documents and decisions, and more.