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United States of America Updates Natural Gas Processing Equipment Emissions Standards

United States of America finalized technical amendments to emissions standards for natural gas processing equipment, including flaring and vent gas monitoring, to improve environmental performance and compliance accuracy.

USA – NATURAL GAS PROCESSING

US Updates Emissions Rules for Gas Equipment

Operators get more time to comply and new options for monitoring flares and vent gas.

What changed

Compliance deadlines extended for control devices, equipment leaks, and storage vessels.

Monitoring rules updated for vent gas net heating value to improve accuracy.

Alternative performance tests allowed for flares and enclosed combustion devices.

Reporting requirements reinstated that were previously deleted in 40 CFR 60.5420b(b)(1) through (15).

Who it affects

Natural gas processing facilities must implement updated monitoring and adhere to extended timelines.

United States — natural gas processing equipment emissions standards

Compliance Answer: Finalized Technical Amendments to U.S. Emissions Standards for Natural Gas Processing Equipment

The U.S. Environmental Protection Agency (EPA) has finalized discrete technical amendments to the New Source Performance Standards (NSPS) OOOOb and Emission Guidelines (EG) OOOOc for the Crude Oil and Natural Gas source category, specifically targeting emissions from natural gas processing equipment, including flaring and vent gas monitoring. These amendments address two key areas: (1) temporary flaring provisions for associated gas in certain situations, and (2) vent gas net heating value (NHV) continuous monitoring requirements and alternative performance testing options for flares and enclosed combustion devices (ECDs)1.

Regulation Analysis

1. Key Amendments and Requirements

The finalized amendments introduce the following changes to improve environmental performance and compliance accuracy:

RegulationKey RequirementDeadline/ThresholdAuthority
NSPS OOOOb / EG OOOOcVent Gas NHV Continuous Monitoring: Owners/operators must continuously monitor the NHV of vent gas routed to flares or ECDs to ensure compliance with emissions standards1. Alternative performance testing (sampling demonstration) is permitted1.Effective June 8, 20261.40 CFR Part 60, Subparts OOOOb/OOOOc; Clean Air Act (CAA) §1111.
NSPS OOOObTemporary Flaring Provisions: Technical changes to allow temporary flaring of associated gas in specific situations (e.g., emergencies, equipment malfunctions) under defined conditions1.Effective June 8, 20261.40 CFR Part 60, Subpart OOOOb; CAA §111(b)1.
Process ControllersCompliance Deadline Extension: New sources may demonstrate interim compliance (95% emissions reduction) for up to 1 year from the rule’s effective date before achieving zero emissions2. Applies to sites in Alaska without electrical power2.Full compliance by December 3, 20253.40 CFR Part 60, Table 12 (89 FR 16882)2; CAA §1112.
NHV Monitoring DeadlineExtended Compliance Deadline: Initial deadline for NHV continuous monitoring extended to November 28, 20253.November 28, 20253.2025 Interim Final Rule (IFR)3; CAA §1113.
Alternative MethodsEquivalent/Alternative Methods: Sources may request approval for equivalent or alternative compliance methods under 40 CFR 60.8(b)(2) or 40 CFR 60.5412b(d)/60.5415b(f)(1)(xi)2.Not specified.40 CFR Part 602.

2. Scope and Applicability

  • Source Category: The amendments apply to the Crude Oil and Natural Gas source category, which includes:
    1. Crude oil production (well to custody transfer).
    2. Natural gas production, processing, transmission, and storage (well to city-gate)2.
  • Affected Equipment:
    • Flares and enclosed combustion devices (ECDs)1.
    • Process controllers (e.g., natural gas-driven controllers in Alaska)2.
    • Closed vent systems (CVS) and storage vessels3.

3. Compliance Pathways and Flexibilities

A. Vent Gas NHV Monitoring

  • Continuous Monitoring: Owners/operators must install and operate NHV monitoring systems to ensure vent gas meets combustion efficiency standards1.
  • Alternative Performance Test: As an alternative to continuous monitoring, sources may conduct periodic sampling demonstrations to verify compliance1.

B. Temporary Flaring Provisions

  • Associated Gas: Technical changes permit temporary flaring of associated gas in emergencies or during equipment malfunctions, subject to reporting and recordkeeping requirements1.

C. Process Controllers

  • Interim Standard: Until full compliance (zero emissions) is achieved, owners/operators must comply with an interim standard mirroring requirements for Alaska sites without electrical power (95% emissions reduction via control devices)2.
  • Alaska-Specific Provision: Sites in Alaska without electrical power may route emissions from natural gas-driven process controllers to a control device achieving 95% emissions reduction2.

D. Extended Deadlines

  • The EPA extended several compliance deadlines in the 2025 Interim Final Rule (IFR) to provide regulated entities additional time3:
    • NHV Monitoring: November 28, 2025 (from earlier deadlines).
    • Control Devices/Equipment Leaks/Storage Vessels: January 22, 2027.
    • State Plan Submittals (EG OOOOc): January 22, 2027.
    • Super Emitter Program (SEP): Implementation delayed to January 22, 2027.

4. Reporting and Recordkeeping

  • Reinstated Regulatory Text: The final rule corrects an error in the December 2025 Final Rule by reinstating reporting requirements under 40 CFR 60.5420b(b)(1)–(15)1.
  • Formatting Updates: The EPA also updated regulatory text to comply with Office of the Federal Register formatting and style requirements1.

5. Effective Dates and Judicial Review

  • Final Rule Effective Date: June 8, 20261.
  • Incorporation by Reference: Approved by the Director of the Federal Register as of June 8, 20261.
  • Judicial Review: Challenges to the final rule may be filed in the U.S. Court of Appeals for the District of Columbia Circuit within 60 days of publication in the Federal Register3.

Summary Answer

The EPA finalized technical amendments to NSPS OOOOb and EG OOOOc for natural gas processing equipment, focusing on vent gas NHV continuous monitoring and temporary flaring provisions1. Key changes include:

  1. NHV Monitoring: Continuous monitoring or alternative performance testing for flares/ECDs, with an extended compliance deadline of November 28, 20251, 3.
  2. Process Controllers: New sources may comply with an interim 95% emissions reduction standard for up to 1 year before achieving zero emissions2.
  3. Temporary Flaring: Permitted in specific situations (e.g., emergencies) under revised technical provisions1.
  4. Effective Date: The final rule takes effect on June 8, 20261.

These amendments aim to improve compliance accuracy while providing flexibility for regulated entities1, 3, 2. For related context on extended deadlines, see4, 5.

Sources

  1. ↩ members.wto.org — final measure / 26 01989 00 e https://members.wto.org/crnattachments/2026/TBT/USA/final_measure/26_01989_00_e.pdf
  2. ↩ Extension of Deadlines in Standards of Performance for New, Reconstructed, and Modified Sources and Emissions Guidelines for Existing Sources: Oil and Natural Gas Sector Climate Review Final Rule https://members.wto.org/crnattachments/2025/TBT/USA/final_measure/25_05142_00_e.pdf
  3. ↩ members.wto.org — final measure / 25 08526 00 e https://members.wto.org/crnattachments/2025/TBT/USA/final_measure/25_08526_00_e.pdf
  4. ↩ WTO TBT notification 25-05609 — United States of America https://members.wto.org/crnattachments/2025/TBT/USA/25_05609_00_e.pdf
  5. ↩ WTO TBT notification 25-05578 — United States of America https://members.wto.org/crnattachments/2025/TBT/USA/25_05578_00_e.pdf
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