40 C.F.R. § 60.5368c

What if my state or Tribal plan is not approvable?

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If you do not submit a state or Tribal plan (or a negative declaration letter) by January 22, 2027, or if EPA disapproves your state plan, EPA will develop a Federal plan according to § 60.27a(c) through (f) to implement the emission guidelines contained in this subpart.

[90 FR 35984, July 31, 2025]