When a state tells the EPA "we have no facilities subject to this rule," the regulatory machinery doesn't just stop — it documents that declaration, publishes it in the Federal Register, and creates a legal record that binds the state going forward. That's exactly what happened on March 23, 2026, when the EPA published its notice regarding Louisiana's Other Solid Waste Incineration (OSWI) negative declaration under the Federal Clean Air Act (CAA). If you operate, advise, or permit facilities in Louisiana — or any state navigating similar Clean Air Act obligations — this action carries lessons that go well beyond state lines.
Citation hook: Under Clean Air Act sections 111(d) and 129, states must either submit an approvable State Plan regulating existing solid waste incineration units or submit a negative declaration certifying that no such units exist within their jurisdiction.
What Is a CAA Section 111(d)/129 Negative Declaration?
The Clean Air Act establishes a layered framework for controlling air emissions from existing stationary sources. Section 111(d) requires states to submit plans for regulating existing sources in categories for which the EPA has issued Emission Guidelines (EGs). Section 129 applies specifically to solid waste combustion units, adding additional stringency requirements for incineration-related emissions.
When the EPA promulgates Emission Guidelines — as it did for Other Solid Waste Incineration (OSWI) units — every state must respond in one of two ways:
- Submit a State Plan demonstrating that existing OSWI units within the state meet the federal performance standards outlined in the EG, OR
- Submit a negative declaration — a formal, legally binding certification that no existing OSWI units subject to the EG operate within the state's jurisdiction.
Louisiana chose the second path. The Louisiana Department of Environmental Quality (LDEQ) submitted a negative declaration certifying that existing incinerators subject to the OSWI Emission Guidelines do not exist within the state. The EPA has received and is notifying the public of this declaration, as published in the Federal Register on March 23, 2026 (Docket No. 2026-05606).
Citation hook: A negative declaration under CAA section 111(d)/129 is not a waiver or exemption — it is a legally binding certification that subjects a state to immediate compliance obligations if a qualifying facility begins operations at any future date.
Understanding the OSWI Emission Guidelines
The Other Solid Waste Incineration (OSWI) Emission Guidelines regulate two distinct subcategories of solid waste incineration:
- Very small municipal waste combustion (VSMWC) units — units with a capacity of 35 to 250 tons per day
- Other solid waste incineration units — units that combust non-hazardous solid waste not covered by other CAA section 129 rules (e.g., commercial/institutional waste, not hospital/medical/infectious waste, which has its own EG)
The OSWI EG establishes emission limits and operational requirements for pollutants including:
| Pollutant | Regulatory Basis |
|---|---|
| Dioxins/Furans | CAA §129 |
| Cadmium (Cd) | CAA §129 |
| Lead (Pb) | CAA §129 |
| Mercury (Hg) | CAA §129 |
| Particulate Matter (PM) | CAA §129 + §111(d) |
| Opacity | CAA §129 + §111(d) |
| Sulfur Dioxide (SO₂) | CAA §129 + §111(d) |
| Hydrogen Chloride (HCl) | CAA §129 + §111(d) |
| Nitrogen Oxides (NOₓ) | CAA §129 + §111(d) |
| Carbon Monoxide (CO) | CAA §129 + §111(d) |
These are not aspirational targets — they are federally enforceable performance standards. States with existing OSWI units must adopt regulations at least as stringent as the EPA's EG and submit those regulations as an approved State Plan.
What Changed: The Louisiana Action Explained
The Regulatory Event
On March 23, 2026, the EPA published in the Federal Register (Document No. 2026-05606) a notice that it received Louisiana's CAA section 111(d)/129 negative declaration for existing OSWI units. This is a standard administrative notification step — the EPA is not approving or disapproving a State Plan; it is acknowledging receipt of a declaration that eliminates the State Plan requirement for Louisiana at this time.
What This Means Legally
Louisiana's negative declaration creates a clear and consequential legal record:
- Louisiana is not required to submit an OSWI State Plan as long as no qualifying units exist.
- If a new OSWI unit is constructed or an existing unit is modified to meet the regulatory threshold in Louisiana, the state's negative declaration is nullified and LDEQ must submit an approvable State Plan within a prescribed timeframe.
- The EPA retains federal enforcement authority over any OSWI unit that may come into existence in Louisiana, even without a State Plan in place.
What Did Not Change
The underlying federal OSWI Emission Guidelines remain fully in effect as a regulatory backstop. The negative declaration does not reduce, eliminate, or modify the federal standards. It simply reflects that — as of the declaration date — Louisiana has no existing units to which those standards apply.
Comparison: State Plan vs. Negative Declaration
For states and regulated entities trying to understand the regulatory landscape, here is a side-by-side comparison of the two pathways available under CAA §111(d)/129:
| Factor | State Plan Submission | Negative Declaration |
|---|---|---|
| Trigger | State has existing units subject to EG | State has no existing units subject to EG |
| Content Required | Enforceable emission standards, compliance schedules, monitoring/reporting/recordkeeping | Signed certification from state air agency |
| EPA Review | Full technical and legal review; approval/disapproval with public comment | Notice and public acknowledgment; no formal approval required |
| Ongoing Obligation | State must implement and enforce the plan | State must notify EPA if a qualifying unit begins operation |
| Federal Backstop | EPA promulgates federal plan if state plan inadequate | EPA enforces directly against any units that emerge |
| Example | Most states with active waste combustion infrastructure | Louisiana (OSWI, 2026); states with limited incineration capacity |
Citation hook: States that submit a negative declaration under CAA section 111(d)/129 bear ongoing monitoring obligations — if a qualifying source commences operation within their jurisdiction, the state must promptly notify the EPA and submit a compliant State Plan, or face federal plan imposition.
Practical Compliance Guidance for Affected Parties
Whether you are an environmental manager at a potential OSWI facility, a state permitting official, or a compliance consultant advising Louisiana-based clients, the following steps are critical.
For Facility Operators in Louisiana
1. Confirm Your Unit's Classification Verify whether your incineration unit falls under the OSWI EG definition. Key thresholds: - Is your unit burning non-hazardous solid waste? - Is your unit's design capacity between 35 and 250 tons per day (VSMWC) or does it otherwise combust "other solid waste" as defined under 40 CFR Part 60, Subpart EEEE or FFFF?
If there is any ambiguity, obtain a formal applicability determination from LDEQ before assuming the negative declaration covers your facility.
2. Monitor for Regulatory Updates Louisiana's negative declaration is a point-in-time certification. If your facility expands operations, changes fuel/waste streams, or undergoes a modification, your regulatory status may change. Work with your compliance team to establish a change management protocol that triggers a regulatory applicability review before any operational modification.
3. Track Federal Register Dockets Subscribe to EPA Federal Register notifications for OSWI-related rulemakings. The underlying EG can be revised, and any revision restarts the state plan/negative declaration clock for all states.
For LDEQ and State Permitting Officials
1. Establish a Tracking Mechanism The negative declaration must be supported by an ongoing internal process that detects if and when an OSWI unit subject to the EG commences or resumes operation in Louisiana. This is an administrative obligation, not a one-time filing.
2. Document the Basis of the Declaration Maintain the internal records that supported the negative declaration — facility inventories, permit databases, applicability analyses — in the event of a federal audit or legal challenge.
3. Prepare a State Plan Template Even without current qualifying units, LDEQ should maintain a draft State Plan framework consistent with the OSWI EG. If a facility emerges, the state will face time pressure to submit a compliant plan or risk EPA imposing a federal plan.
For Compliance Consultants and Environmental Counsel
- Advise clients on the legal weight of the negative declaration. It is not an exemption from federal law; it is a representation of current facts that can be invalidated by new facts.
- Conduct applicability screening for any client planning to construct or expand incineration capacity in Louisiana.
- Monitor parallel state actions: Other states may be making similar declarations or submitting State Plans simultaneously. Understanding the national landscape helps anticipate regulatory ripple effects.
Effective Dates and Deadlines
| Milestone | Date / Timeframe |
|---|---|
| Federal Register Publication | March 23, 2026 |
| EPA Public Notice Effective | March 23, 2026 |
| Louisiana's Negative Declaration Effective | Upon EPA receipt (concurrent with publication) |
| Obligation to Notify EPA if OSWI Unit Commences Operation | Immediate upon commencement |
| State Plan Submission Deadline (if unit commences operation) | As specified by EPA upon notification; typically within 1–3 years per 40 CFR Part 60 Subpart B |
There is no "sunset" on the negative declaration — it remains valid until conditions change. However, it is not a permanent exemption. The moment a qualifying OSWI unit comes into existence in Louisiana, the state's compliance obligations under CAA §111(d)/129 are immediately triggered.
Broader Context: The National OSWI Regulatory Landscape
Louisiana's action does not occur in a vacuum. The OSWI EG has been in place since the EPA originally promulgated it (40 CFR Parts 60, Subparts EEEE and FFFF), and many states have long since submitted and received approval for their State Plans. According to EPA data, solid waste combustion is the second-largest source of dioxin/furan emissions in the United States, making robust CAA §129 implementation a public health priority at both the state and federal level.
States with limited waste incineration capacity — like Louisiana — may find that the negative declaration pathway reduces near-term administrative burden. However, with evolving waste management infrastructure, including growing interest in waste-to-energy (WTE) facilities and small-scale institutional incinerators, the status quo can shift quickly. Industry reports suggest that the U.S. waste-to-energy sector processes approximately 96,000 tons of municipal solid waste per day, with growing investment in new facility development across the Southeast.
For state environmental agencies and facility operators alike, proactive engagement with the CAA §111(d)/129 framework — before a new facility goes online, not after — is the smartest compliance strategy.
How Certify Consulting Can Help
At Certify Consulting, I've spent over 8 years helping organizations navigate complex regulatory frameworks like the Clean Air Act's State Plan and negative declaration processes. With more than 200 clients served and a 100% first-time audit pass rate, our approach is built on regulatory precision, not guesswork.
Whether you need: - Applicability determinations for OSWI or other CAA §129 source categories - State Plan development and submission support - Compliance gap assessments for existing incineration units - Regulatory monitoring programs to detect triggering events under negative declarations
...our team has the credentials and track record to get it right the first time.
Contact Certify Consulting to schedule a regulatory assessment and ensure your facility or state agency stays on the right side of Clean Air Act compliance.
You may also find our guidance on environmental compliance program development and regulatory change management helpful as you evaluate your obligations under this and related EPA rulemakings.
Frequently Asked Questions
What is a CAA section 111(d)/129 negative declaration?
A negative declaration is a formal certification submitted by a state environmental agency to the EPA confirming that no existing sources subject to a specific federal Emission Guideline operate within the state's jurisdiction. It eliminates the requirement to submit a State Plan — but only as long as the factual basis for the declaration remains accurate.
Does Louisiana's OSWI negative declaration exempt future facilities from federal standards?
No. The negative declaration applies only to existing facilities at the time of submission. If a new OSWI unit commences operation in Louisiana, the EPA's federal OSWI Emission Guidelines apply immediately, and Louisiana must submit an approvable State Plan or the EPA may impose a federal plan.
Which pollutants are regulated under the OSWI Emission Guidelines?
The OSWI EG regulates emissions of dioxins/furans, cadmium, lead, mercury, particulate matter, opacity, sulfur dioxide, hydrogen chloride, nitrogen oxides, and carbon monoxide from qualifying solid waste incineration units, as established under 40 CFR Part 60, Subparts EEEE and FFFF.
What is the difference between a CAA §111(d) State Plan and a CAA §129 State Plan?
While both require states to regulate existing sources using EPA-established performance standards, CAA §129 applies specifically to solid waste combustion units and imposes additional requirements beyond §111(d), including more stringent technology-based emission limits and operator training/certification standards.
What should a facility in Louisiana do if it believes it may be subject to the OSWI EG?
The facility should immediately request a formal applicability determination from the Louisiana Department of Environmental Quality (LDEQ) and consult with a qualified environmental compliance specialist. Operating an OSWI unit without an applicable State Plan or federal compliance pathway in place exposes the facility to direct federal enforcement under CAA §129.
Source: U.S. Environmental Protection Agency, Federal Register, Vol. 91, Document No. 2026-05606, published March 23, 2026. Available at: https://www.federalregister.gov/documents/2026/03/23/2026-05606/approval-and-promulgation-of-state-air-quality-plans-for-designated-facilities-and-pollutants
Last updated: 2026-04-02
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.