Missouri Eases Rules on Emergency Generator Permits
Published Date: 10/8/2026
Rule
Summary
The EPA is giving a thumbs-up to Missouri’s updated rules about when construction permits aren’t needed, especially for emergency generators. These changes make the rules clearer and update recordkeeping, helping businesses and the environment. The new rules kick in on November 9, 2026, so folks in Missouri should get ready to follow them!
Analyzed Economic Effects
5 provisions identified: 1 benefits, 4 costs, 0 mixed.
Missouri permit exemptions become federally enforceable
The EPA approved Missouri’s revisions to 10 CSR 10-6.061 (Construction Permit Exemptions) into the State Implementation Plan (SIP), and those materials are fully federally enforceable under Clean Air Act sections 110 and 113 as of November 9, 2026.
Emergency generator exemptions narrowed
Missouri’s revised 10 CSR 10-6.061 adds extra criteria that an emergency generator must meet to qualify for the construction-permit exemption and narrows the exemption’s applicability for sources that operate more than one emergency generator.
Recordkeeping requirements clarified and tightened
The revised 10 CSR 10-6.061 clarifies recordkeeping: owners and operators must maintain records that demonstrate compliance with construction-permit exemptions and must show actual emissions remain below the rule’s thresholds.
Lead exemptions tightened (876 lb/yr cap reference)
The revisions remove language that could have been interpreted to allow lead emissions associated with construction/modification to be excluded from the 876 lb/year cap and strengthen the lead compound permit exemption threshold in 10 CSR 10-6.061.
EPA finds changes won’t harm air-quality attainment
The EPA concluded the revisions to Missouri’s 10 CSR 10-6.061 do not add exemptions to construction permitting and will not interfere with Missouri’s ability to attain or maintain National Ambient Air Quality Standards (NAAQS).
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