Last updated: 2026-03-26
The EPA has officially approved a significant revision to the Texas State Implementation Plan (SIP) governing Reasonably Available Control Technology (RACT) requirements for volatile organic compounds (VOC) and nitrogen oxides (NOₓ) in the Dallas-Fort Worth (DFW) ozone nonattainment area. Published in the Federal Register on March 23, 2026 (Docket No. 2026-05607), this action carries real, near-term compliance obligations for stationary source operators throughout the DFW region.
If your facility emits VOCs or NOₓ in the Dallas-Fort Worth Serious nonattainment area, this is not background reading — this is an action item.
What Changed: The Regulatory Background
The EPA's March 2026 SIP Approval
Pursuant to the Federal Clean Air Act (CAA), the U.S. Environmental Protection Agency approved revisions to the Texas SIP submitted by the State of Texas on May 12, 2022, concerning RACT requirements under the 2008 8-hour ozone National Ambient Air Quality Standards (NAAQS). The DFW area is classified as a Serious nonattainment area under those standards — a designation that carries stricter obligations than Moderate or Marginal classifications.
The approved revisions address both VOC and NOₓ emission controls for stationary sources and represent Texas's demonstration to EPA that it has adopted all control measures meeting the RACT threshold for major sources in the DFW nonattainment area.
Citation hook: The EPA's approval of Texas's SIP revision under the 2008 8-hour ozone NAAQS confirms that the Dallas-Fort Worth area must apply Reasonably Available Control Technology to all major stationary sources of VOC and NOₓ as a condition of its Serious nonattainment classification under the Clean Air Act.
Why the 2008 Ozone NAAQS Matters Here
The 2008 ozone NAAQS set a standard of 75 parts per billion (ppb) for ground-level ozone, measured as an 8-hour average. Areas failing to meet this standard are classified into severity tiers — Marginal, Moderate, Serious, Severe, and Extreme — with each tier triggering progressively more stringent regulatory requirements. Under CAA Section 182(b)(2), Moderate and above nonattainment areas must adopt RACT for all VOC sources covered by a Control Techniques Guideline (CTG) and for all major non-CTG VOC sources. Serious areas add additional NOₓ RACT requirements under CAA Section 182(f).
The DFW area's Serious classification means it faces the full weight of both VOC and NOₓ RACT obligations simultaneously.
Understanding RACT: A Practical Definition
RACT is defined by the EPA as the lowest emission limitation that a particular source is capable of meeting by the application of control technology that is reasonably available, considering technological and economic feasibility. The key word is reasonably — RACT is not the absolute best available technology, but it is meaningfully beyond baseline performance.
| RACT vs. Other Control Technology Standards | Definition | When Required |
|---|---|---|
| RACT (Reasonably Available Control Technology) | Lowest emissions achievable by reasonably available, economically feasible technology | Nonattainment areas (Moderate and above) |
| BACT (Best Available Control Technology) | Best emission reduction for new/modified major sources in attainment areas | PSD permitting under CAA |
| LAER (Lowest Achievable Emission Rate) | Most stringent rate achievable; no cost consideration | New/modified major sources in nonattainment areas (NSR) |
| MACT (Maximum Achievable Control Technology) | Based on best performers in an industry category | Hazardous air pollutant sources under CAA Section 112 |
Understanding where RACT sits in this hierarchy is essential. It is more flexible than LAER but more demanding than what many older facilities currently have in place. For DFW-area facilities that have not updated their emission controls in recent years, this SIP approval signals a regulatory benchmark they must now demonstrably meet.
Who Is Affected: Applicability in the DFW Nonattainment Area
Major Source Thresholds in a Serious Nonattainment Area
In a Serious ozone nonattainment area, the major source threshold drops to 50 tons per year (tpy) of VOC or NOₓ — compared to 100 tpy in attainment areas. This means a significantly larger universe of facilities is subject to RACT in DFW than would otherwise apply. Industries commonly affected include:
- Petroleum refining and petrochemical processing
- Industrial coating operations (automotive, metal, wood furniture)
- Printing and publishing operations
- Solvent cleaning and degreasing operations
- Stationary combustion sources (boilers, turbines, internal combustion engines)
- Chemical manufacturing and storage facilities
- Cement and glass manufacturing
Citation hook: In a Serious ozone nonattainment area like Dallas-Fort Worth, the major source threshold for VOC and NOₓ is 50 tons per year — half the threshold applicable in attainment areas — meaning a substantially broader set of industrial facilities becomes subject to RACT obligations under the approved Texas SIP.
CTG and Non-CTG Sources
RACT applies to two classes of sources:
- CTG sources — industries for which the EPA has published a Control Techniques Guideline document. These guidelines establish a presumptive RACT level, and states must adopt regulations at least as stringent as the CTG presumption.
- Non-CTG major sources — major sources not covered by a CTG. States must conduct a case-by-case RACT analysis for these facilities.
Texas's approved SIP revisions address both categories, giving operators a clearer regulatory benchmark against which to assess their current controls.
What the Texas SIP Revision Requires
VOC RACT Requirements
The Texas SIP revisions establish enforceable VOC emission limits and work practice standards for covered source categories in the DFW area. These align with or exceed EPA CTG presumptive RACT levels. Operators of VOC-emitting facilities should review:
- Emission limits expressed in pounds of VOC per gallon, per unit of throughput, or as a percentage reduction
- Work practice standards such as leak detection and repair (LDAR) programs for equipment components
- Compliance schedule requirements for facilities requiring retrofits or process changes
- Recordkeeping and reporting obligations to demonstrate ongoing compliance
NOₓ RACT Requirements
NOₓ RACT requirements, triggered under CAA Section 182(f) for Serious nonattainment areas, apply to major stationary combustion sources. The Texas SIP sets enforceable NOₓ emission limits for:
- Natural gas-fired boilers and process heaters
- Stationary combustion turbines
- Stationary internal combustion engines (spark-ignited and compression-ignited)
- Other major NOₓ point sources
Compliance pathways typically include low-NOₓ burner technology, selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), or fuel switching.
Citation hook: NOₓ RACT requirements in Serious ozone nonattainment areas apply to all major stationary combustion sources and commonly require the installation of low-NOₓ burner technology, selective catalytic reduction, or other engineered emission controls to achieve compliance with state-adopted emission limits.
Effective Dates and Compliance Deadlines
The SIP revision was published in the Federal Register on March 23, 2026, and EPA final rules of this type typically carry an effective date 30 to 60 days from Federal Register publication, placing the regulatory effective date in the April–May 2026 timeframe. Operators should confirm the exact effective date in the final rule text at federalregister.gov/documents/2026/03/23/2026-05607.
However, effective date ≠ compliance deadline. The Texas Commission on Environmental Quality (TCEQ) and EPA enforcement posture will be informed by whether facilities can demonstrate that their current operations already meet RACT, or whether they require capital improvements or operational changes to come into compliance.
Key action items by timeline:
| Timeframe | Required Action |
|---|---|
| Immediately | Identify whether your facility qualifies as a major source (≥50 tpy VOC or NOₓ) in DFW |
| Within 30 days | Conduct a gap assessment comparing current controls to RACT standards in the approved SIP |
| Within 60–90 days | Engage TCEQ permitting staff if permit revisions are required to reflect new emission limits |
| Ongoing | Update LDAR programs, recordkeeping systems, and compliance monitoring protocols |
Practical Compliance Guidance for Facility Operators
Step 1: Confirm Your Applicability Status
Start with a simple applicability determination. Review your most recent emissions inventory data against the 50 tpy major source threshold. If you are borderline, use your actual emissions data — not permitted limits — as a starting point, but be aware that potential-to-emit (PTE) calculations may govern your classification.
Step 2: Obtain and Review the Approved SIP Language
Download the Texas SIP revision and the specific rule language from the TCEQ website or the Federal Register docket. Identify which source categories or emission units within your facility are covered by specific RACT requirements. Do not rely on summaries — the enforceable language is what matters in an inspection or enforcement proceeding.
Step 3: Conduct a RACT Gap Assessment
Compare your current emission controls, operating parameters, and documented work practices against each applicable RACT requirement. A structured gap assessment should evaluate:
- Equipment controls — Are your burners, oxidizers, or scrubbers capable of meeting the required emission limits?
- Operational practices — Do your standard operating procedures reflect RACT-compliant work practices?
- Monitoring and recordkeeping — Are you capturing the data required for compliance demonstration?
- Permit conditions — Do your existing permit conditions reflect the new enforceable limits, or do they need revision?
Step 4: Update Your Environmental Management System
For facilities operating under ISO 14001:2015, this SIP approval is exactly the type of regulatory change that your legal and other requirements register (ISO 14001:2015 clause 6.1.3) must capture. The approved SIP limits become binding compliance obligations that should be tracked, assigned to responsible personnel, and subject to internal audit procedures.
If you don't have a systematic process for identifying and evaluating changes in environmental regulations, this is a critical gap — and not just for ISO 14001 purposes. Facilities with robust ISO 14001 environmental management systems are demonstrably better positioned to identify, assess, and respond to regulatory changes like this one before they become enforcement issues.
Step 5: Engage Permitting Counsel and Technical Experts Early
If your gap assessment reveals that current controls fall short of RACT, begin the permit revision process as quickly as possible. TCEQ air permitting timelines can be lengthy, and proactively engaging the agency signals good faith. In enforcement contexts, documentation of a diligent compliance effort carries real weight.
The Broader Context: Why DFW Ozone Compliance Matters
Ground-level ozone is a secondary pollutant — it is not emitted directly but forms in the atmosphere through photochemical reactions between VOCs and NOₓ in the presence of sunlight. The DFW metroplex, with its dense industrial base, high vehicle miles traveled, and hot summers, presents persistent challenges for ozone attainment.
According to the EPA's Air Quality Index (AQI) data, the Dallas-Fort Worth area recorded ozone concentrations exceeding the 75 ppb NAAQS standard on multiple days per year in recent reporting cycles, underscoring why Serious nonattainment classification and aggressive RACT implementation remain necessary.
Nationally, ground-level ozone is associated with significant public health impacts: the American Lung Association estimates that approximately 100 million Americans live in counties that received an "F" grade for ozone pollution, highlighting the national stakes of nonattainment area enforcement.
Failure to achieve and maintain ozone NAAQS standards in Serious nonattainment areas can trigger EPA sanctions under CAA Section 179, including the loss of federal highway funds and the imposition of an 2:1 emission offset ratio for new major source permits — both of which carry enormous economic consequences for the region.
How an Environmental Management System Strengthens Your Compliance Position
At Certify Consulting, I've worked with over 200 clients — including industrial facilities in complex nonattainment contexts — to build environmental management systems that don't just satisfy auditors but deliver operational resilience against exactly these kinds of regulatory shifts.
A well-implemented ISO 14001 environmental management system integrates regulatory tracking, compliance evaluation, and corrective action into a single operational framework. When an EPA SIP approval like this one hits the Federal Register, facilities with mature EMS platforms are already positioned to:
- Log the new requirement against relevant emission units
- Assign accountability for gap assessment and remediation
- Document compliance verification for internal and external audit purposes
- Demonstrate good faith engagement to regulators if issues are identified
Facilities without that infrastructure are left scrambling — reviewing permits, calling consultants, and hoping nothing fell through the cracks.
Our 100% first-time audit pass rate across 8+ years of consulting work reflects a methodology built around exactly this kind of proactive, systems-based compliance management. Whether you need a gap assessment, permit review support, or full EMS implementation, Certify Consulting can help you get ahead of the curve. Visit certify.consulting to learn more.
FAQ: Dallas-Fort Worth RACT Requirements Under the Texas SIP
What is RACT and why does it apply to DFW?
RACT (Reasonably Available Control Technology) is the minimum emission control standard required for major stationary sources in ozone nonattainment areas. DFW is classified as a Serious nonattainment area under the 2008 8-hour ozone NAAQS (75 ppb standard), triggering RACT requirements for both VOC and NOₓ sources under Clean Air Act Sections 182(b)(2) and 182(f).
What is the major source threshold in the DFW Serious nonattainment area?
In a Serious ozone nonattainment area, the major source threshold is 50 tons per year (tpy) of VOC or NOₓ — compared to 100 tpy in attainment areas. Facilities at or above this threshold are subject to RACT obligations under the approved Texas SIP.
When does the EPA's approval of the Texas SIP revision take effect?
The SIP revision was published in the Federal Register on March 23, 2026. EPA final rules of this type typically take effect 30 to 60 days after publication. Operators should consult the final rule text at the Federal Register docket (2026-05607) to confirm the precise effective date.
What should my facility do immediately in response to this SIP approval?
Immediately confirm whether your facility qualifies as a major source in DFW (≥50 tpy VOC or NOₓ), then conduct a gap assessment comparing your current emission controls to the RACT standards in the approved SIP. If permit revisions are needed, engage TCEQ permitting staff as soon as possible given agency processing timelines.
How does ISO 14001 help with RACT compliance?
ISO 14001:2015 requires organizations to identify and track legal and other requirements (clause 6.1.3) and evaluate compliance (clause 9.1.2). A certified EMS creates a systematic process for capturing regulatory changes like this SIP approval, assigning accountability, and documenting compliance actions — reducing the risk of missed obligations and strengthening your position in the event of an inspection or enforcement action.
Source: U.S. Environmental Protection Agency, Federal Register, Vol. 91, March 23, 2026, Docket No. 2026-05607. Air Plan Approval; Texas; Reasonably Available Control Technology in the Dallas-Fort Worth Ozone Nonattainment Area.
Last updated: 2026-03-26
Jared Clark
Principal Consultant, Certify Consulting
Jared Clark is the founder of Certify Consulting, helping organizations achieve and maintain compliance with international standards and regulatory requirements.