Clean Air Act Operating Permit Program Revisions; California; Amador County Air Pollution Control District, Calaveras County Air Pollution Control District, Great Basin Unified Air Pollution Control District, Northern Sierra Air Quality Management District
Key claim: The EPA proposes to approve revisions by four California air districts that remove emergency affirmative defense provisions from their Clean Air Act Title V operating permit program rules.
Abstract
(Proposed Rule · Environmental Protection Agency) The Environmental Protection Agency (EPA) is proposing to approve revisions to four State of California air districts’ Clean Air Act title V program rules to remove emergency affirmative defense provisions. The four districts are the Amador County Air Pollution Control District (ACAPCD), the Calaveras County Air Pollution Control District (CCAPCD), the Great Basin Unified Air Pollution Control District (GBUAPCD), and the Northern Sierra Air Quality Management District (NSAQMD) (“Districts”). This proposed action is being taken in accordance with Federal regulations and the Clean Air Act (CAA or “Act”). We are taking comments on these proposed revisions and plan to follow with a final action.
Why this matters
Emergency affirmative defense provisions historically shielded sources from monetary penalties for excess emissions during malfunctions, and the D.C. Circuit has held such defenses inconsistent with the Clean Air Act’s citizen-suit and enforcement structure. Approving these California district revisions brings local Title V programs into line with federal requirements, tightening enforceability of permit limits during upsets while removing a compliance cushion that operators had relied on. The action is administrative housekeeping but reflects an ongoing nationwide cleanup of affirmative-defense language across state and local operating permit programs.