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 This website is no longer updated and links to external websites and some internal pages may not work.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

Is replacing a process tank considered a modification?

If an RMP covered facility replaces a storage tank that is a covered process with a new tank containing the same regulated substance, is this considered to be a modification of an existing process, or a new process?

Assuming the new tank contains the same substance and occupies the same location as the previous tank, this would generally be considered a modification to an existing process.