Published: March 2026 | Last updated: 2026-04-01
When a state formally tells the EPA "we don't have any of those facilities," it sounds routine. But for environmental compliance professionals, a negative declaration under Clean Air Act (CAA) Section 111(d)/129 carries real legal weight — and understanding what it does and doesn't do for your organization is essential.
On March 23, 2026, the EPA published a Federal Register notice (Document No. 2026-05606) announcing that it had received a CAA Section 111(d)/129 negative declaration from Louisiana for existing incinerators subject to the Other Solid Waste Incineration (OSWI) Emission Guidelines (EG). This declaration certifies that no existing incinerators subject to the OSWI EG and the requirements of CAA Sections 111(d) and 129 currently exist within Louisiana's jurisdiction.
This article breaks down exactly what that means, who it affects, what the regulatory history looks like, and — most importantly — what practical steps environmental compliance managers should take right now.
What Is a CAA Section 111(d)/129 Negative Declaration?
Under the Clean Air Act, Section 111(d) requires states to submit plans to control emissions from existing sources in categories where the EPA has established Emission Guidelines. Section 129 adds a parallel, more stringent layer specifically for solid waste combustion units, requiring state plans to implement and enforce standards at least as protective as the federal EG.
A negative declaration is a formal written statement submitted by a state to the EPA certifying that no sources subject to a specific Emission Guideline exist within that state. When accepted by the EPA, the negative declaration relieves the state of the obligation to develop, submit, and enforce a full Section 111(d)/129 State Plan for that source category.
Citation hook: A CAA Section 111(d)/129 negative declaration, once accepted by EPA, legally substitutes for a full State Implementation Plan for the applicable source category, eliminating the state's regulatory obligation to promulgate enforceable emission standards for that category within its jurisdiction.
This is not a loophole or an exemption. It is a factual certification with legal consequences — and it must be accurate. If a covered facility is later discovered operating in the state without the corresponding state plan in place, both the facility and the state face significant regulatory exposure.
The OSWI Emission Guidelines: A Quick Background
The Other Solid Waste Incineration (OSWI) Emission Guidelines are federal rules established under CAA Sections 111(d) and 129 that govern emissions from existing solid waste incineration units that do not fall under other specific incineration categories (such as municipal waste combustors or medical/infectious waste incinerators).
OSWI units typically include:
- Very small municipal waste combustion units (capacity ≤ 35 tons/day)
- Commercial and industrial solid waste incineration (CISWI) units of certain types
- Other incinerators burning solid waste not covered by a more specific EG category
The OSWI EG establishes emission limits for pollutants including:
| Pollutant | Regulatory Basis | Why It Matters |
|---|---|---|
| Particulate Matter (PM) | CAA § 129 | Respiratory health impacts |
| Opacity | CAA § 129 | Indicator of combustion efficiency |
| Carbon Monoxide (CO) | CAA § 129 | Combustion byproduct, toxicity risk |
| Dioxins/Furans | CAA § 129 | Persistent organic pollutants |
| Hydrogen Chloride (HCl) | CAA § 129 | Acid gas, corrosive and toxic |
| Nitrogen Oxides (NOx) | CAA § 111(d) | Ozone precursor |
| Sulfur Dioxide (SO₂) | CAA § 111(d) | Acid rain contributor |
| Mercury | CAA § 129 | Neurotoxin, bioaccumulates |
| Lead | CAA § 129 | Developmental toxin |
| Cadmium | CAA § 129 | Carcinogen |
States with OSWI facilities are required to develop state plans implementing these emission limits. States without any OSWI facilities — like Louisiana in this case — may file a negative declaration instead.
What Louisiana's Negative Declaration Actually Says
The Louisiana negative declaration, published in the Federal Register on March 23, 2026 (2026-05606), specifically certifies:
- No existing incinerators subject to the OSWI Emission Guidelines currently operate within Louisiana's jurisdiction.
- Louisiana is therefore not required to submit a Section 111(d)/129 State Plan for the OSWI source category.
- The EPA has received and is notifying the public of this declaration per standard regulatory procedure.
The Federal Register notice is a public notification, not a final rule. It informs regulated entities, environmental advocates, and the public that the EPA has accepted this certification. The practical effect is immediate: Louisiana has no pending State Plan obligation for OSWI units unless and until a covered facility begins operating in the state.
Citation hook: According to the EPA's March 23, 2026 Federal Register notice (Document 2026-05606), Louisiana's negative declaration certifies that existing incinerators subject to the OSWI Emission Guidelines do not exist within the state's jurisdiction, releasing Louisiana from the obligation to promulgate a corresponding Section 111(d)/129 State Plan.
Why This Matters Beyond Louisiana's Borders
You might be reading this from Texas, Mississippi, or another Gulf Coast state and wondering why Louisiana's negative declaration is relevant to you. Here's why it matters across the board:
1. It Sets a Compliance Precedent
When states file — and the EPA accepts — negative declarations, it clarifies the regulatory landscape for the entire region. Facilities near state borders, or those planning to expand operations, need to understand whether a neighboring state's absence of a state plan creates any cross-boundary compliance gaps.
2. It Signals EPA Enforcement Priorities
The EPA's acceptance of a negative declaration is also an implicit audit trigger. The agency is on record acknowledging which states have no regulated OSWI facilities. If a covered unit is discovered operating in Louisiana without proper permits or plan coverage, it will be treated as a knowing violation — there is no ambiguity about regulatory applicability.
3. It Affects Multi-State Organizations
Organizations that operate solid waste management or incineration infrastructure across multiple states need to track which states have active Section 111(d)/129 State Plans and which have filed negative declarations. Compliance obligations differ substantially between these two categories.
Key Regulatory Comparison: State Plan vs. Negative Declaration
| Factor | State With OSWI Facilities (State Plan Required) | State With No OSWI Facilities (Negative Declaration) |
|---|---|---|
| Regulatory Obligation | Must develop & submit State Plan | Submits negative declaration |
| Enforceable Emission Limits | Yes — per OSWI EG standards | None required (no facilities) |
| Monitoring & Reporting Requirements | Yes — per State Plan | None (no covered sources) |
| Facility Permitting | Required under state plan | Not applicable |
| Consequences if Covered Facility Found | Already regulated | Major compliance gap; immediate exposure |
| EPA Oversight | Ongoing | Triggered if facility discovered |
| Public Notice Required? | Yes | Yes (Federal Register notification) |
Effective Dates and Regulatory Deadlines
Based on the Federal Register notice (2026-05606), here are the critical dates:
- March 23, 2026: Federal Register publication of EPA notice of Louisiana's negative declaration.
- Ongoing: Louisiana's negative declaration remains in effect unless and until a facility subject to the OSWI EG begins operation in the state.
- If a New OSWI Facility Opens: Louisiana would be required to submit a new Section 111(d)/129 State Plan within the timeframes specified under 40 CFR Part 60, Subpart FFFF (the OSWI EG rule) — typically within 1 year of a covered facility becoming subject to the EG.
Citation hook: Under 40 CFR Part 60, Subpart FFFF, states whose facilities become subject to the OSWI Emission Guidelines after a negative declaration has been accepted must submit a new Section 111(d)/129 State Plan within the timeframes specified in the Emission Guideline, generally within one year of the regulatory trigger date.
The Broader Statistical Context: OSWI Regulation Nationwide
Understanding Louisiana's declaration requires context about OSWI regulation across the United States:
- According to the EPA, the OSWI EG was promulgated in 2005 and covers an estimated hundreds of small incineration units across the country, a significantly smaller universe than municipal waste combustors.
- The EPA estimates that OSWI units emit approximately 0.1% of total U.S. dioxin emissions from combustion sources — a small share, but one that is strictly regulated due to the extreme toxicity of dioxins and furans at trace levels.
- Across all Section 111(d)/129 source categories, more than a dozen states have filed negative declarations for one or more categories, reflecting the uneven geographic distribution of industrial and solid waste infrastructure.
- The CAA Section 129 program covers six categories of solid waste combustors, and compliance rates for states with active plans hover above 90% for emission limits according to EPA annual reports on air quality compliance.
- Studies published by the EPA Office of Air Quality Planning and Standards indicate that proper implementation of OSWI Emission Guidelines can reduce dioxin/furan emissions from covered units by up to 99% compared to uncontrolled operations.
Practical Compliance Guidance for Environmental Managers
Whether you're operating in Louisiana or a neighboring state, here is actionable guidance based on this regulatory development:
Step 1: Confirm Your Facility's Classification
Determine whether any of your operations — including waste handling, on-site incineration, or thermal treatment — could be classified as an OSWI unit under 40 CFR Part 60, Subpart FFFF. The key threshold: units with a capacity of ≤ 35 tons/day that burn solid waste not covered by another specific EG are most likely to be in scope.
Step 2: Audit Your State's Plan Status
If you operate in multiple states, verify whether each state has an active Section 111(d)/129 State Plan for OSWI or has filed a negative declaration. Negative declaration states may have less clearly defined permitting pathways for new or expanding facilities — which means more regulatory uncertainty, not less.
Step 3: Check Your Air Permits Against Current State Plan Requirements
If you're in a state with an active OSWI State Plan, confirm that your Title V or minor source permits reflect the current applicable emission limits and monitoring requirements. State plans can be revised, and permit conditions don't always update automatically.
Step 4: Implement an Environmental Monitoring Protocol Aligned With ISO 14001
This is where ISO 14001:2015 environmental management systems become directly relevant. Specifically: - Clause 6.1.2 requires organizations to identify environmental aspects and associated legal obligations — OSWI status and applicable EG limits must be documented. - Clause 9.1.2 requires compliance evaluation, including tracking the applicability and status of regulations like OSWI State Plans. - Clause 10.2 requires corrective action when compliance gaps are identified.
Organizations with a robust ISO 14001-compliant EMS are far better positioned to identify when a new regulatory obligation (like a state plan requirement triggered by a new facility) applies to them — and to respond before the EPA comes knocking.
Learn more about building a compliance-ready EMS on our ISO 14001 implementation guide or explore how environmental compliance auditing can protect your organization.
Step 5: Monitor the Federal Register for Related Notices
The OSWI EG is not the only CAA Section 111(d)/129 category where negative declarations are filed. Subscribe to EPA notifications or work with a compliance consultant to monitor relevant rulemakings and state plan actions that could affect your operations. At Certify Consulting, I track these developments across all 50 states for our clients — it's part of the ongoing value of a managed compliance relationship.
What This Means for New or Expanding Facilities in Louisiana
If you are planning to build, acquire, or expand a solid waste incineration facility in Louisiana, the existence of a negative declaration has a very specific implication: there is currently no approved OSWI State Plan in Louisiana. That means:
- The federal OSWI Emission Guidelines apply directly as the enforceable standard under CAA Section 129 in the absence of an approved state plan.
- Louisiana would need to submit a new state plan — or you would need to work with the state environmental agency to develop applicable permit conditions — before your facility could legally operate.
- The timeline for state plan development and EPA approval can take 18–36 months, which should factor into any facility development schedule.
This is not an environment where the absence of a state plan equals the absence of regulation. It's the opposite: federal standards apply directly, with less flexibility than a state-administered plan might otherwise provide.
How Certify Consulting Helps Clients Navigate CAA Compliance
Over my 8+ years advising more than 200 clients — with a 100% first-time audit pass rate — I've seen how regulatory nuances like negative declarations can catch organizations off guard. A facility expansion that seems routine suddenly triggers a Section 111(d)/129 state plan requirement. A permitting gap that existed for years surfaces during an EPA inspection.
At Certify Consulting, we help clients:
- Map regulatory applicability across all CAA Section 111(d)/129 categories and applicable state plans
- Integrate air quality compliance into ISO 14001-compliant environmental management systems
- Prepare for EPA and state regulatory audits with complete documentation and evidence packages
- Monitor Federal Register rulemakings that affect facility operations before effective dates hit
Whether you're in Louisiana, navigating a multi-state compliance portfolio, or building your EMS from the ground up, our team is ready to help. Visit certify.consulting to schedule a consultation.
Frequently Asked Questions
What is a CAA Section 111(d)/129 negative declaration?
A negative declaration is a formal certification submitted by a state to the EPA confirming that no existing sources subject to a specific Emission Guideline operate within the state. When accepted, it relieves the state of the obligation to develop a Section 111(d)/129 State Plan for that source category.
Does Louisiana's OSWI negative declaration mean the state is exempt from air quality rules?
No. It means Louisiana has certified that no OSWI facilities currently exist within its jurisdiction. If a covered facility were to begin operating, Louisiana would be required to develop a State Plan or the federal Emission Guidelines would apply directly.
What facilities are covered by the OSWI Emission Guidelines?
The OSWI EG covers existing solid waste incineration units that do not fall under other specific EPA incineration categories. This primarily includes very small municipal waste combustion units (≤ 35 tons/day) and certain other incinerators burning solid waste.
How does ISO 14001 help with CAA compliance obligations?
ISO 14001:2015 requires organizations to identify and track applicable legal and regulatory requirements (Clause 6.1.2), evaluate compliance (Clause 9.1.2), and take corrective action when gaps are found (Clause 10.2). A well-implemented EMS ensures that regulatory changes — like new state plan requirements — are captured and acted upon promptly.
Where can I find the full text of Louisiana's OSWI negative declaration notice?
The EPA's Federal Register notice was published on March 23, 2026, as Document No. 2026-05606. It is publicly available at the Federal Register website and on the EPA's air rulemakings portal.
Last updated: 2026-04-01
Jared Clark, JD, MBA, PMP, CMQ-OE, CPGP, CFSQA, RAC is the Principal Consultant at Certify Consulting. He has served 200+ clients across environmental, quality, and regulatory compliance disciplines. Learn more at certify.consulting.
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.