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 This website is no longer updated and links to external websites and some internal pages may not work.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 »

Underground Injection Control (UIC)

UIC Class II Primacy for the State of Michigan

EPA is approving the State of Michigan’s Underground Injection Control Class II (UIC) Program for primacy. EPA reviewed the primacy application package, which met the regulatory criteria. EPA’s approval allows Michigan to implement and enforce its state regulations for UIC Class II injection wells located within the state, except in Indian County. This rule will be effective 90 days after date of publication in the Federal Register.  In the event that EPA receives adverse comment during the comment period, EPA will take the next appropriate steps.

Comments on this action will be accepted for 30 days after the notice publishes in the Federal Register.  To submit comments on this action, once published, visit the Federal Register visit

The pre-publication Federal Register notice is available for review and linked below.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.