Tier II Reporting Moves From 24 Hazard Categories to 118

EPA has finalized a rule rewriting how facilities describe chemical hazards on their annual EPCRA inventory reports, replacing 24 broad hazard categories with the 118 hazard classes and categories that OSHA’s Hazard Communication Standard already uses. The rule published June 22, 2026 and takes effect August 21, 2026. The obligation itself does not attach until calendar year 2027, which puts the first reports filed on the new categories at the March 1, 2028 deadline.

The Effective Date and the Compliance Date Sit Well Apart

EPA set the compliance date at January 1, 2028, more than sixteen months after the rule takes effect. Reports due March 1, 2027 covering calendar year 2026 still use the current hazard categories, and calendar year 2027 reports, due March 1, 2028, are the first that must carry the expanded set. That sixteen-month gap belongs on a compliance calendar now, because the preparation work has a longer lead time than a form revision usually suggests.

The Category Count Nearly Quintuples

Health hazards expand from 11 categories to 56, and physical hazards expand from 13 to 62. The growth comes from adopting OSHA’s full classification tree rather than the condensed groupings EPCRA has used since 2017.

Acute toxicity, previously one category covering any exposure route, splits into 20 subcategories across oral, dermal, inhalation dusts and mists, gases, and vapors. Carcinogenicity splits into four categories, while skin corrosion and skin irritation separate from each other, as do serious eye damage and eye irritation. Specific target organ toxicity divides into single exposure and repeated or prolonged exposure.

The physical hazard side gains entirely new classes for aerosols, chemicals under pressure, and desensitized explosives. Oxidizers separate into gases, liquids, and solids, while gas under pressure divides into compressed, dissolved, liquefied, and refrigerated liquefied. Pyrophoric gas disappears as a standalone entry and moves under flammable gases.

Transcription Replaces Interpretation

The practical shift for facilities is that the reporting task stops being a translation exercise. Under the current structure, a facility reads its Safety Data Sheet, then maps the OSHA classification onto a shorter EPCRA list that does not match it one to one, and the expanded categories remove that step. “The updated approach removes the current interpretation burden and simply requires the selection of the hazard category on the Tier II Form that matches the hazard category present on the SDS,” EPA wrote in the final rule.

Reporting thresholds and chemical coverage stay exactly where they are. EPA stated plainly that the action “does not create any additional requirements for affected facilities,” and the agency projects annual cost savings of $12.83 million across roughly 463,000 affected facilities. The rule also strikes Material Safety Data Sheet terminology from 14 sections of 40 CFR Part 370, standardizing on Safety Data Sheet throughout.

The Real Work Sits in the SDS Library

OSHA’s own transition window for the 2024 Hazard Communication Standard runs from May 20, 2024 through May 19, 2028, which means the EPCRA compliance date arrives while some suppliers are still shipping 2012-format sheets. EPA accommodated both formats, but a facility working from a 2012 SDS during calendar year 2027 has to reconcile three renamed hazard categories against an EPA guidance matrix by hand.

A facility that reaches 2028 with a current, consistently formatted SDS library files by reading Section 2 and selecting the matching category. A facility that reaches 2028 with a mixed library does the mapping manually, chemical by chemical, for every product above threshold.

That reconciliation burden scales with the breadth of an inventory rather than its volume. Laboratories, research operations, and manufacturing sites carrying hundreds of distinct products in small quantities face far more work than a facility storing three bulk chemicals. Operations consolidating or clearing out aged chemical inventories ahead of the deadline should handle that work through proper lab packing procedures, since unknown and unlabeled containers carry no usable SDS at all.

States Carry the Change Through Their Own Systems

Every state currently requires the Tier II inventory form, and the Tier I form is not accepted anywhere. States operating independent Tier II systems must adopt the expanded categories, and EPA has committed to releasing updated Tier2 Submit and CAMEO Data Manager software by November of each year, along with revised forms, training materials, and National Tier II Data Standard specifications for states running custom software.

California facilities submit Tier II data through the California Environmental Reporting System as part of the Hazardous Materials Business Plan, so the change reaches operators through their Certified Unified Program Agency rather than directly from EPA. The CUPA reporting structure already routes inventory data through a local agency, and that agency’s software timeline determines when California facilities see the new categories in practice. Texas and Missouri facilities should confirm their own state timelines with their State Emergency Response Commission.

Where to Start Before Calendar Year 2027

Three steps carry most of the preparation value before the calendar year 2027 reporting period opens. Audit the SDS library and record which sheets are 2012 format and which are 2024, because that inventory determines how much manual mapping calendar year 2027 requires. Ask suppliers for updated sheets on any product still documented under the older standard. Confirm with the state agency that receives the filing when its system will accept the expanded categories.

Inventory reporting under EPCRA sections 311 and 312 is a separate obligation from release notification under section 304, and this rule touches only the inventory side. Facilities reviewing their broader emergency reporting posture can find the release notification requirements covered in the EPCRA Section 304 reporting guide.