Iowa Air Regulations Simplified by EPA Without Weakening Protections
Published Date: 3/26/2026
Proposed Rule
Summary
The EPA is updating Iowa’s air quality rules to make them clearer and simpler without weakening pollution protections. These changes affect businesses and regulators by removing outdated programs, fixing errors, and combining rules for easier use. You’ve got until April 27, 2026, to share your thoughts—no extra costs or delays expected!
Analyzed Economic Effects
5 provisions identified: 3 benefits, 0 costs, 2 mixed.
Iowa air rules simplified and combined
Iowa reorganized and simplified its air quality rules by consolidating 14 chapters into 8, updating definitions and citations, and making minor wording and grammar changes. The State submitted these revisions to EPA on July 26, 2024, and the EPA is proposing to approve the changes into the SIP and Title V Operating Permit Program.
Emission Reduction Program removed from SIP
Iowa requested removal of the Emission Reduction Program (IAC 567-21.3) from the SIP; that program had been SIP-approved on May 31, 1972. The EPA found that Iowa strengthened its variance language and retains enforcement discretion, and therefore proposes that removing the Emission Reduction Program from the SIP does not interfere with attainment or reasonable further progress under CAA section 110(l).
Voluntary Operating Permit (VOP) removed from SIP
Iowa removed its Voluntary Operating Permit (VOP) program (IAC 567-22.200–22.209) from the SIP; the EPA had approved VOP into the SIP on April 30, 1996, and Iowa removed the VOP rules from the Iowa Administrative Code in 2015. The EPA finds that Iowa's construction permit rules provide adequate authority to limit potential to emit (PTE) and that removing the VOP from the SIP does not interfere with CAA section 110(l) requirements.
EPA correcting prior SIP inclusion errors
The EPA proposes to remove four provisions it says were approved into the Iowa SIP in error under CAA section 110(k)(6): IAC Chapter 27 (Certificate of Acceptance), IAC 567-22.1(3)(b)(8) (case-by-case MACT application), IAC 567-25.1(12) (SO2 CEMS tie to an alternative program), and IAC 567-23.1(1) (general NSPS/NESHAP reference). EPA states these provisions are not required for implementation, maintenance, or enforcement of the NAAQS.
Title V permit paperwork reduced for applicants
In the proposed Title V Operating Permit Program revisions, Iowa removed a requirement that copies of Title V operating permit applications be submitted to EPA Region 7 and relocated many operating permit rules from Chapter 22 into Chapter 24. The state effective date for these rule revisions is June 19, 2024, and EPA is proposing part 70 approval of the relocations and retained definitions.
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