EPA Delegates Air Rules Enforcement to Oklahoma
Published Date: 12/18/2025
Rule
Summary
The EPA is officially giving Oklahoma the power to enforce updated air pollution rules for new factories and sources, based on standards set through June 30, 2023. This change starts January 20, 2026, and affects businesses and areas, including some Indian lands, that must follow these cleaner air rules. It means Oklahoma will handle inspections and enforcement, helping keep the air cleaner without extra federal delays or costs.
Analyzed Economic Effects
4 provisions identified: 1 benefits, 0 costs, 3 mixed.
Oklahoma Gets NSPS Enforcement Power
Starting January 20, 2026, the Oklahoma Department of Environmental Quality (ODEQ) is delegated the authority to implement and enforce New Source Performance Standards (NSPS) promulgated by EPA as they existed through June 30, 2023, for sources located in Oklahoma. If your facility is subject to the delegated NSPS, ODEQ — not the EPA — will carry out implementation and enforcement of those standards.
Specific NSPS Categories Delegated to ODEQ
The rule adds a table (Table 3 to Sec. 60.4) listing specific 40 CFR part 60 subparts delegated to ODEQ (e.g., subparts for fossil-fueled steam generators, petroleum refineries, storage vessels, municipal solid waste landfills, stationary turbines, and many others) as amended through June 30, 2023. Firms in the listed industry categories in Oklahoma will be subject to State implementation and enforcement of those delegated NSPS subparts.
Delegation Extends Into Indian Country Areas
The NSPS delegation to ODEQ will apply to areas of Indian country in Oklahoma covered by EPA's prior SAFETEA approval, but excludes certain Indian allotments, trust lands, and specific Tribal-owned fee lands described in the rule. EPA offered consultation to 38 Tribal governments and states the action will not impose substantial direct compliance costs on federally recognized tribal governments or preempt Tribal law.
No New Burden on Small Entities
EPA certified under the Regulatory Flexibility Act that approving Oklahoma's requested NSPS delegation will not have a significant economic impact on a substantial number of small entities and will have no net regulatory burden beyond State law. The EPA found ODEQ's October 28, 2024 request meets Federal requirements and does not impose additional Federal requirements.
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