Expert Insights: Four commonly overlooked categories in TRI reporting
TRI reporting can be tricky, even for seasoned EHS teams. Many facilities meet all the requirements but still miss chemicals that should be reported. Most oversights fall into four key categories. Here’s what they are, why they get missed, and a few simple examples that show up in routine operations.
Newly added or updated TRI chemicals
The TRI list changes more often than many people realize. EPA regularly updates it and recently added new per- and poly-fluoroalkyl substances (PFAS) and even a full diisononyl phthalate (DINP) chemical category. When facilities don’t review these updates each year, they may keep using materials that now contain reportable chemicals without realizing it. For example, PFAS were expanded for Reporting Years 2024 and 2025, and the DINP category was added in 2023. These changes mean that everyday items like coatings, lubricants, and flexible plastics can suddenly trigger TRI thresholds.
“Otherwise used” chemicals
Not every reportable chemical is manufactured or processed. Many are simply “otherwise used,” including solvents, degreasers, cleaners, and maintenance chemicals. Facilities often overlook these because they aren’t part of the product mix, but they can add up fast. Even common shop chemicals, when used across a year, can exceed the 10,000-pound threshold and require reporting.
Coincidentally manufactured byproducts
Some chemicals are created unintentionally during normal operations. Ammonia may form during baking or heating steps, nitrates often appear in wastewater treatment, and metal compounds can be generated during welding, machining, or corrosion. These substances count as “manufactured” under TRI even if they weren’t intentionally manufactured. Examples like ammonia, nitrates, metal compounds, and diesel byproducts such as naphthalene and polycyclic aromatic compounds are regularly overlooked in TRI reporting because they’re easy to underestimate.
Impurities or additives in mixtures
Many reportable chemicals hide inside mixtures, oils, coatings, lubricants, and chemical blends. If a facility focuses only on the main ingredients, they may miss the smaller additive or impurity that’s actually subject to TRI reporting. These overlooked components can push a facility over a reporting threshold, even when the product is used in small amounts.
TRI oversights usually occur not because facilities ignore the rules, but because chemicals show up in unexpected forms. Keeping an eye on updates, tracking cleaners and maintenance chemicals, monitoring byproducts, and checking mixtures closely can prevent the most common reporting mistakes.






















































