Is a state plan required for all States?

No, you are not required to submit a state plan if there are no existing incineration units that are an OSWI unit as defined in §§ 60.2992 and 60.3078 or air curtain incinerators subject to this subpart as described in § 60.2994 in your state and you submit a negative declaration letter in place of the state plan. [90 FR 27955, June 30, 2025]