An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Enbridge Revised Maximum Operating Pressure Values

Below are the maximum operating pressures (MOP) that Enbridge uses to operate its Lakehead system pipelines: 1, 2B, 3, 4, 5, 6A, 6B-78, 10, 14, 61, 62, 64, 65 and 67.  Enbridge designates a specific MOP value for a portion of each pipeline.  The proposed Consent Decree references these MOP values.  The following Excel files are all dated Jan. 25, 2017.