Class VI UIC Well Permitting: Every Submittal and Stage
What a Class VI UIC well permit application must contain under 40 CFR 146, how EPA reviews it stage by stage, and what changes in a primacy state.
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EPA OOOO and Federal Methane Rules
The federal methane rules for oil and gas come as a series of subparts under the Clean Air Act: OOOO and OOOOa for older sites, OOOOb for sites built or modified after December 6, 2022, and OOOOc for existing sources through state plans. Which one applies depends on when a site was built or changed, and the newer rules have been amended repeatedly.
These posts explain what each subpart requires, where the compliance deadlines stand, how leak detection and repair work in practice, and what happened to the waste emissions charge. For the full picture of OOOOb, start with the explainer.
Because the rules have moved through proposals, interim final rules and amendments, the posts separate what is in effect from what is proposed and date each change. Compliance software and the records a compliance program needs to keep are covered too.
17 posts in this topic
Subpart W Guidance: EPA GHG Reporting for Oil and Gas
Subpart W is EPA's greenhouse gas reporting rule for oil and gas: its ten segments, the two 25,000 metric ton tests, what to report, and the rule's 2026 status.
Operator-Reported Methane vs Satellite Data: Why They Differ
Satellites usually find more oil and gas methane than reported inventories. The reasons, from abnormal events to detection limits, and how to reconcile the two.
EHS Management Software and What It Cannot Compute
EHS software is a system of record. It handles the documents and dates well, and stores whatever emissions number you give it rather than deriving one.
Leak Detection in Oil and Gas: What Each Method Finds
Controlled-release testing shows what methane leak detection actually finds. Why the surveyor matters as much as the camera, and what a survey cannot see.
Colorado Regulation 7: What It Requires and What It Costs
Colorado Regulation 7 no longer has a Part D. What Part B requires, which sections are statewide, and how the intensity verification factor is set.
What Is Subpart W Suspension? State Rules Still Apply
Federal methane reporting faces suspension while Colorado ONGAEIR and New Mexico mandates stay fully enforceable. How multi-state O&G operators should respond.
Inflation Reduction Act: What Is Left for Methane in 2026
The IRA methane charge was not repealed. Its rule was disapproved and the charge moved to 2034. What still binds oil and gas operators, provision by provision.
OOOOb Compliance Software: What to Track and How to Choose
OOOOb sets six survey frequencies and two repair clocks by site type, and the rule is under reconsideration. Here is what to track and how to evaluate tools.
Continuous Emission Monitoring Systems: When CEMS Apply
A CEMS is a certification regime, not a sensor. Which oil and gas equipment needs one, what changed for turbines in 2026, and the quarterly cost.
New Mexico Ozone Season O&G Rules: NMED Requirements
NMED 20.2.82 NMAC requires heightened LDAR surveys and equipment controls for New Mexico oil and gas facilities during the May through October ozone season.
OOOOb and OOOOc Explained: Coverage and January 2027 Deadlines
40 CFR 60 Subpart OOOOb covers oil and gas sites built after December 6, 2022. Which subpart applies, what it requires, and why most deadlines moved to 2027.
Class II Injection Wells and the Other UIC Classes, Explained
About 180,000 Class II oil and gas injection wells operate in the US, most for enhanced recovery, not disposal. The six UIC classes and where records live.
EPA's April 2026 OOOOb/OOOOc Amendment: What Changed
EPA revised OOOOb/OOOOc temporary flaring and NHV monitoring, effective June 8, 2026. Most flares and combustion devices are now exempt from NHV monitoring.
EPA OOOOb/c Status Is Uncertain: How Operators Should Plan
EPA OOOOa is in effect, the IRA methane charge is deferred to 2034 and OOOOb/c is under reconsideration. Here is each rule's status and how to plan.
Subpart W Proposed Rule: Is GHGRP Reporting Still Required?
The Subpart W proposed rule (90 FR 44591) would pause reporting through RY2034, but it is not final. Facilities still file RY2025 data by March 10, 2027.
GHGRP Subpart W Deadline Moved to March 10, 2027
EPA moved the RY2025 GHGRP filing deadline to March 10, 2027, while a separate proposal to suspend Subpart W reporting through 2034 remains pending.