With less than a year until key compliance deadlines, time is running out for chemical manufacturers to act
Montrose Environmental Group, Inc. (NYSE: MEG), is on a mission to help protect the air we breathe, the water we drink, and the soil that feeds us to enhance environmental stewardship while supporting economic development. The company is currently engaged in more than 30 projects nationwide to help chemical manufacturers prepare for the upcoming Hazardous Organic NESHAP Maximum Achievable Control Technology (HON MACT) regulation. These efforts span emissions testing, compliance strategy, and monitoring implementation—all designed to support facilities facing deadlines that begin in mid-2026. With less than a year remaining, Montrose is helping clients navigate complex requirements and avoid costly delays.
The HON MACT rule, finalized by the U.S. Environmental Protection Agency in 2024, targets hazardous air pollutants emitted by synthetic organic chemical manufacturing and polymer and resin facilities. The regulation introduces stricter controls on ethylene oxide (EtO), chloroprene, and other air toxics, with the goal of reducing community-wide cancer risks by up to 96%.1 Key compliance deadlines include July 15, 2026, for fenceline monitoring and EtO control requirements, and July 15, 2027, for corrective actions and broader equipment upgrades.
“HON MACT is one of the most important air regulations in recent history for chemical manufacturers. With long equipment lead times and limited service capacity, the time to act is now,” said Todd Grosshandler, Chief Commercial Officer at Montrose Environmental Group. “This rule is part of a broader wave of regulations reaffirming clean air as a basic right. Montrose brings together regulatory expertise, advanced laboratory and testing capabilities, and deployed field teams across a broad geographic footprint to help clients not only meet the rule—but lead the way in environmental responsibility.”
Montrose offers a full suite of end-to-end emissions and air testing capabilities, including fenceline monitoring with both real-time and integrated sampling solutions, stack testing, ambient air quality monitoring, leak detection and repair (LDAR), flare efficiency assessments, and compliance program development—supported by the only accredited laboratory in the nation our team of scientists and engineers works closely with clients to deliver tailored solutions that meet regulatory requirements and operational goals.
