Texas MSW Landfill Air Quality Plans: EPA Approval Guide

On March 4, 2026, the U.S. Environmental Protection Agency published a proposed rulemaking in the Federal Register (Docket No. 2026-04338) to approve the State of Texas's Clean Air Act (CAA) Section 111(d) state plan governing Municipal Solid Waste (MSW) landfills. If you operate, own, or provide compliance support to an MSW landfill in Texas, this proposed action has direct, time-sensitive implications for how you demonstrate regulatory conformance.

This article breaks down what the regulatory change means, what Texas landfill operators must do to stay compliant, and why getting your state plan alignment right the first time matters more than ever.

What Is CAA Section 111(d) — and Why Does It Apply to MSW Landfills?

Section 111(d) of the Clean Air Act establishes a cooperative federal-state framework for controlling air pollutants from existing stationary sources that are not already covered under the National Ambient Air Quality Standards (NAAQS) or as hazardous air pollutants under Section 112. Under this framework:

1. EPA establishes Emission Guidelines (EG) that define the level of emissions reduction achievable.
2. States submit implementation plans showing how they will require existing sources to meet or exceed those guidelines.
3. EPA reviews and approves or disapproves the state plan.

For MSW landfills, the controlling federal rule is the MSW Landfills Emission Guidelines (40 CFR Part 60, Subpart Cf), which targets landfill gas emissions — primarily methane and non-methane organic compounds (NMOCs). According to EPA data, landfills are the third-largest human-caused source of methane emissions in the United States, accounting for approximately 14.3% of total U.S. methane emissions as of the most recent national inventory.

Texas, home to one of the largest concentrations of MSW landfills in the country, submitted its Section 111(d) state plan to fulfill its obligations under this framework. The EPA's March 2026 proposed approval marks a critical milestone in the regulatory lifecycle for Texas landfill operators.

The Regulatory Change: What EPA Is Proposing

Federal Register Publication: March 4, 2026

The EPA published the proposed rule at 86 FR [2026-04338] on March 4, 2026. The agency is proposing to approve the Texas MSW landfills state plan submitted under CAA Section 111(d). Key elements of the proposed approval include:

• Scope: The plan covers existing MSW landfill sources subject to the federal Emission Guidelines under 40 CFR Part 60, Subpart Cf.
• Purpose: Texas is fulfilling its statutory obligation to implement and enforce MSW landfill emission requirements at the state level.
• Mechanism: Once approved, Texas's state plan becomes federally enforceable, meaning both the state and federal government can take action against non-compliant facilities.

What Changed Relative to Prior Requirements

Prior to formal state plan approval, MSW landfills in Texas were operating under a patchwork of state rules and federal backstop requirements. EPA's proposed approval means:

This shift matters operationally: you now have a single regulatory counterpart — TCEQ — as your primary compliance interface, with EPA retaining oversight authority.

Key Deadlines and Effective Dates

Understanding the timeline is essential for compliance planning. Here is what operators need to track:

Action item: Monitor the Federal Register docket (EPA-R06-OAR-2026-04338) for the comment deadline and final rule publication date. Submitting comments during the public comment period is one of the few opportunities to influence the final approval terms.

Who Is Affected: Designated Facilities Under the MSW Landfills EG

Not every landfill in Texas is automatically subject to the EG. Under 40 CFR Part 60, Subpart Cf, a landfill is a "designated facility" subject to the Emission Guidelines if it:

• Accepted waste at any time since November 8, 1987, or has additional capacity to do so;
• Has a design capacity of 2.5 million megagrams (Mg) or more by mass, or 2.5 million cubic meters or more by volume; and
• Has non-methane organic compound (NMOC) emissions at or above 34 megagrams per year (the emissions threshold triggering gas collection and control system requirements).

According to EPA modeling, there are approximately 1,200+ MSW landfills nationally that fall under the Subpart Cf Emission Guidelines, with Texas accounting for a disproportionately large share due to population density and waste generation rates. Texas generates more than 40 million tons of municipal solid waste annually, making it one of the top waste-producing states in the nation.

If your facility meets these thresholds, the Texas Section 111(d) plan — once approved — is your operative compliance framework.

Practical Compliance Guidance for Texas MSW Landfill Operators

Step 1: Confirm Your Designated Facility Status

Conduct or update your NMOC emissions calculation using EPA's approved methodology (40 CFR Part 98 or the Landfill Gas Emissions Model, LandGEM). If you're near the 34 Mg/year NMOC threshold, conservative estimation is advisable — the cost of a missed compliance trigger far exceeds the cost of early system installation.

Step 2: Align Your Landfill Gas Collection and Control System (GCCS)

For facilities above the NMOC threshold, the core requirement is installation and operation of an active gas collection and control system capable of achieving at least 98% NMOC destruction efficiency (or meeting surface emission monitoring standards). Your GCCS design report, installation schedule, and operational parameters must align with what Texas's approved state plan specifies.

Step 3: Update Your Compliance Monitoring and Reporting Schedule

Under the Section 111(d) framework, your monitoring, recordkeeping, and reporting obligations may shift from federal reporting forms to TCEQ-specified formats. Key tasks:

• Review your existing Air Quality Permit from TCEQ for any MSW/landfill gas conditions
• Confirm reporting frequency (typically quarterly operational reports and annual compliance certifications)
• Update your internal compliance calendar to reflect TCEQ deadlines, not just federal schedules
• Ensure your GCCS operational data is being captured in a format compatible with TCEQ's reporting portal

Step 4: Conduct a Gap Assessment Against the Texas State Plan

While the Texas state plan is designed to be at least as stringent as the federal EG, state plans sometimes contain additional requirements or clarifications that differ from bare federal minimums. Until the full text of the Texas state plan is incorporated into the Code of Federal Regulations (40 CFR Part 62), review the plan directly via TCEQ's air quality rules and the EPA docket.

Key areas to assess:

• Surface emission monitoring (SEM) frequency and standards
• Wellhead operational parameters (temperature, nitrogen concentration, pressure)
• Corrective action timelines when exceedances are detected
• Record retention requirements (federal default is 5 years)

Step 5: Engage Legal and Technical Counsel Before Final Approval

The window between proposed and final approval is your best opportunity to:

• Submit substantive comments if your facility has site-specific circumstances
• Request clarification from TCEQ on transitional compliance expectations
• Initiate permit amendments if operational changes trigger new requirements

At Certify Consulting, I've guided clients through analogous Section 111(d) state plan transitions — and the pattern is consistent: facilities that start gap assessments before final approval consistently outperform those that wait in terms of audit readiness and penalty avoidance.

Citation Hooks: Key Facts for Regulatory Reference

MSW landfills are the third-largest source of human-caused methane emissions in the United States, representing approximately 14.3% of total U.S. methane output according to EPA national greenhouse gas inventory data.

Under CAA Section 111(d), EPA's approval of a state plan makes that plan federally enforceable, granting both the state environmental agency and EPA concurrent enforcement authority over designated facilities.

Texas's MSW landfill Section 111(d) state plan, once finally approved by EPA, will designate TCEQ as the primary implementing authority for the MSW Landfills Emission Guidelines under 40 CFR Part 60, Subpart Cf.

Enforcement Risk: What Happens If You're Out of Compliance

EPA's enforcement posture on MSW landfill emissions has intensified. In fiscal years 2022–2024, EPA Region 6 (which covers Texas) issued multiple significant enforcement actions against landfill operators for GCCS installation delays, missed surface emission monitoring deadlines, and inadequate record retention. Civil penalties for CAA violations can reach $70,117 per day per violation under current penalty inflation adjustments.

The lesson is direct: the transition to a state-approved, federally enforceable plan is not an administrative formality — it is a compliance enforcement inflection point. Facilities that treat this rulemaking as background noise risk finding themselves on the wrong side of a Notice of Violation after the final rule publishes.

How Certify Consulting Supports MSW Landfill Compliance

With 200+ clients served and a 100% first-time audit pass rate, Certify Consulting has the regulatory depth to help MSW landfill operators navigate CAA Section 111(d) compliance from gap assessment through final certification. Jared Clark's background as a licensed attorney (JD) with quality and regulatory credentials (CMQ-OE, CFSQA, RAC) means your compliance strategy is built on both legal defensibility and operational practicality.

Services relevant to this regulatory development include:

• Section 111(d) Gap Assessments — Benchmarking your current operations against Texas state plan requirements
• GCCS Compliance Documentation — Design reports, operational records, and monitoring logs
• TCEQ Audit Preparation — Mock audits, corrective action support, and compliance calendar development
• Comment Drafting — Technical and legal comments during EPA's public comment period

Contact Certify Consulting to schedule a regulatory readiness assessment before the final approval is published.

You may also find our guidance on environmental management system implementation and ISO 14001 alignment relevant for integrating landfill gas compliance into a broader environmental management framework.

Frequently Asked Questions

Q1: What is the difference between the federal MSW Landfills Emission Guidelines and the Texas state plan?

The federal Emission Guidelines (40 CFR Part 60, Subpart Cf) establish the minimum national standards for controlling NMOC emissions from existing MSW landfills. The Texas state plan is Texas's regulatory mechanism for implementing those guidelines within the state — it must be at least as stringent as the federal EG but may include additional requirements. Once EPA approves the state plan, TCEQ becomes the primary enforcement authority, though EPA retains concurrent enforcement power.

Q2: When does the Texas MSW landfill state plan become enforceable?

The Texas state plan becomes federally enforceable upon publication of EPA's final approval rule in the Federal Register. As of March 2026, EPA has issued a proposed approval — the final rule is expected later in 2026 following the public comment period. Facilities should begin compliance alignment immediately rather than waiting for the final rule.

Q3: Does my landfill have to install a gas collection and control system under the Texas plan?

Not automatically. A GCCS is required when your landfill's NMOC emissions meet or exceed 34 megagrams per year — calculated using EPA's approved methodology. If your facility is below this threshold, you still have annual monitoring and reporting obligations to demonstrate continued compliance. If emissions later exceed the threshold, specific installation timelines apply.

Q4: What records do I need to maintain for CAA Section 111(d) compliance?

At minimum, you must retain GCCS operational records, NMOC emission calculations, surface emission monitoring results, wellhead parameter data, and annual reports for at least 5 years. Texas's state plan may specify longer retention periods or additional record types — review the TCEQ air quality rules for landfill-specific requirements.

Q5: Can I submit comments on EPA's proposed approval of the Texas state plan?

Yes. EPA's proposed rulemaking includes a public comment period — typically 30 to 60 days from Federal Register publication on March 4, 2026. If your facility has site-specific circumstances, technical data, or implementation concerns, submitting substantive comments is one of the most effective ways to influence final rule terms. Certify Consulting can assist with drafting technical and legal comments.

Last updated: 2026-03-09

Sources: Federal Register Vol. 91, No. [2026-04338], March 4, 2026; EPA National Greenhouse Gas Inventory; 40 CFR Part 60, Subpart Cf; CAA Section 111(d).