How incinerators are permitted: A look at the regulatory framework and EPA’s new streamlining proposal
Incinerators in the United States operate under a complex permitting framework designed to protect air quality, public health, and the environment. Under the Clean Air Act (CAA), facilities that burn waste must meet strict emission standards, maintain operating controls, and follow extensive monitoring and reporting rules. These requirements ensure that incineration, while a valuable tool for waste management, wildfire mitigation, and disaster recovery, remains safe and consistent with federal air quality objectives. Against this backdrop, the U.S. Environmental Protection Agency (EPA) recently proposed a rule to streamline permitting for specific types of incinerators used in wildfire prevention and disaster cleanup, a move that could reduce delays for state and local governments.
The regulatory basis for incinerator permitting
Most incinerators fall under Section 129 of the Clean Air Act, which mandates EPA to establish performance standards and emission guidelines for categories of solid waste combustion units. These standards govern pollutants such as particulate matter, carbon monoxide, sulfur dioxide, nitrogen oxides, lead, cadmium, mercury, hydrogen chloride, and dioxins/furans. Operators must also conduct emissions testing, maintain continuous monitoring equipment, track operational parameters, and submit regular compliance reports.
Permitting generally occurs through Title V operating permits, which consolidate all applicable air quality requirements into a single enforceable document. A Title V permit typically requires annual certifications, detailed recordkeeping, periodic emissions tests, and reporting of deviations. While the Title V program does not impose new standards, it ensures that incinerators comply with all existing federal and state air quality rules.
Different categories of incinerators such as Large Municipal Waste Combustors (LMWC), Small Municipal Waste Combustors (SMWC), Commercial and Industrial Solid Waste Incinerators (CISWI), and Other Solid Waste Incinerators (OSWI) have distinct requirements. These subcategories reflect variations in unit size, waste composition, and operational design, and each has its own subpart under EPA’s air quality regulations.
Air curtain incinerators: A special case
Air Curtain Incinerators (ACIs), which burn wood waste, yard debris, and clean lumber, occupy a niche segment of the permitting landscape. They use a mechanized “curtain” of air to increase combustion efficiency and reduce particulate emissions compared to open burning. However, their regulatory treatment has historically been inconsistent.
Because ACIs fit partly within several existing subparts, operators often face confusion about which monitoring, opacity limits, and reporting duties apply. Overlap across four regulatory categories can create delays, particularly during emergencies when ACIs are deployed to remove vegetative fuels that increase wildfire risk or to process debris after storms.
EPA’s emergent focus on streamlining
In March 2026, EPA announced a proposal to consolidate the regulatory requirements for ACIs used solely to burn wood derived materials into a single subpart under Section 129. The proposal would also allow these ACIs to operate without a Title V permit unless located at a facility that otherwise requires one.
EPA stated that the change would “cut red tape” and provide clarity for state, local, and Tribal governments, allowing them to respond more effectively to natural disasters and conduct wildfire mitigation activities without unnecessary administrative delays. The agency emphasized that unprocessed debris contributes to poor air and water quality and poses safety risks, particularly in post disaster environments.
Context: Broader federal actions on disaster related incineration
The proposal follows earlier federal steps to ease temporary use of incinerators during emergencies. In 2025, EPA issued an interim final rule permitting CISWI units to burn nonhazardous disaster debris for up to eight weeks without prior EPA approval, a provision intended to accelerate cleanup after hurricanes, wildfires, and floods. These units must still operate their pollution control equipment, and extensions beyond eight weeks require EPA authorization.
Such measures reflect the increasing volume of debris associated with severe weather events and the need for rapid, environmentally sound disposal mechanisms. The current proposal for ACIs builds on these efforts by targeting the specific regulatory bottlenecks associated with vegetative and wood waste disposal.
Looking ahead
EPA’s streamlined permitting proposal does not alter emissions standards but rather clarifies and simplifies administrative pathways. If finalized, it may make ACIs more accessible during periods of heightened wildfire risk and in the critical early stages of disaster recovery.
Key to remember: At its core, the permitting system for incinerators aims to balance environmental protection with operational flexibility. The new proposal underscores EPA’s recognition that, in emergency contexts, speed matters but so does environmental stewardship.






















































