EPA Finalizes Plywood and Composite Wood NESHAP Amendments
EPA finalized amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Plywood and Composite Wood Products (PCWP) source category on July 6, 2026. The amendments add maximum achievable control technology (MACT) standards in the form of emission limitations and work practices for several pollutant groups that the existing rule did not fully address. The final rule is published in the Federal Register.
What the Final Rule Covers
The amendments establish MACT standards for these pollutant categories:
- Total hazardous air pollutants (HAP): including acetaldehyde, acrolein, formaldehyde, methanol, phenol, and propionaldehyde
- Non-mercury HAP metals: metal HAPs other than mercury
- Mercury (Hg): addressed as its own category
- Hydrogen chloride (HCl): an acid gas HAP
- Polycyclic aromatic hydrocarbons (PAHs): combustion-related organic HAPs
- Dioxins/furans (D/F): work practice standards (annual burner tune-ups) for direct-fired dryers, plus a numeric D/F limit for direct wood-fired green rotary dryers
- Methylene diphenyl diisocyanate (MDI): numeric standards for reconstituted wood product presses, tube dryers that blow-line blend MDI resin, and miscellaneous coating operations
For each category, EPA is applying emission limitations or work practice standards as appropriate to the emission point. The specific numeric limits, applicability criteria, and compliance dates are set out in the rule text itself. Do not rely on summaries for those values - pull the emission limit tables from the final rule and match them to the process units at the facility in question.
How This Affects Facility Compliance and Site Work
Air Permitting and Title V
Facilities in the PCWP source category that hold Title V operating permits will need to incorporate the amended standards. Permit engineers and consultants supporting these facilities should compare current permit conditions against the new emission limitations and work practices, then identify any monitoring, recordkeeping, or reporting gaps. The compliance schedule in the final rule controls the timeline, so confirm those dates directly from the rule text.
Ohio note: Ohio EPA’s Division of Air Pollution Control implements federal air toxics standards for Ohio facilities. Ohio wood products plants subject to the PCWP NESHAP should expect the amended requirements to flow into their state-issued permits, and should coordinate with their permit writer on timing.
Phase I ESA and Due Diligence
The pollutant list in this rule is a useful reminder of what plywood, particleboard, oriented strand board, and similar plants emit and handle: formaldehyde and other aldehydes from resins, methanol, phenol, metals, and combustion byproducts. If a Phase I Environmental Site Assessment (ESA) covers a current or former composite wood facility, resin storage, press operations, and dryer or boiler areas remain the process areas of interest. The new rule does not change ASTM E1527-21 practice, but air compliance status is a data point worth documenting for an operating facility.
For Environmental Compliance Consultants
Work practice standards typically carry operational obligations - inspections, operating parameter monitoring, and documentation - rather than stack testing alone. Read the work practice provisions closely, because those are the requirements most often missed during the first compliance cycle after a NESHAP amendment.
What to Do Now
If you support a plywood or composite wood products facility:
- Download the final rule from the Federal Register and identify which emission points and process units are subject to the new limits.
- Build a crosswalk between existing permit conditions and the amended standards, flagging new monitoring or testing obligations.
- Confirm the compliance dates stated in the rule text and calendar them for the facility.
- Brief facility management on any capital or operational changes needed to meet the work practice requirements.
For background on how air toxics standards fit into broader site work, see our program overviews.