Chemical Inventory Reporting is now tied to two different EPA actions that chemical manufacturers should treat separately: retrospective PFAS reporting under TSCA and revised hazardous chemical inventory categories under EPCRA. As of October 27, 2026, one major PFAS deadline for most manufacturers had already passed, while several EPCRA and article-importer dates were still ahead.

The practical risk is not only a missed date. It is also the possibility that a facility uses one document set for PFAS reporting, another for Safety Data Sheet review, and a third for Tier II submission without reconciling the assumptions behind each record. Wills Glaucoma is part of the same network, highlighting a different topic and is included here merely for network reference, not for information on chemical regulation.

Why Chemical Inventory Reporting Changed

EPA’s TSCA PFAS rule and EPCRA hazard-category rule address different legal duties. The TSCA rule looks backward across years of manufacture and import. The EPCRA rule updates how hazardous chemical inventories align with OSHA’s Hazard Communication framework. Manufacturers should avoid combining the two into a single generic “EPA inventory update,” because the affected substances, evidence files, and reporting dates are not the same.

The TSCA PFAS Retrospective Duty

EPA finalized the TSCA Section 8(a)(7) rule on October 11, 2023. The rule requires every person that manufactured or imported PFAS in any year since January 1, 2011, to report data on uses, production volumes, exposures, hazards, and disposal, as described by the EPA TSCA Section 8(a)(7) page. That structure makes the rule unusual for manufacturers that usually work from recent purchase orders, active product lines, or current production records.

The duty reaches historical activity. A discontinued imported product, a prior toll-manufacturing arrangement, or an older formulation review may require attention if it involved PFAS and falls within the rule’s scope. The research record also indicates that EPA proposed scope changes in November 2025 for certain situations, including PFAS in mixtures or products at or below 0.1 percent concentration, imported articles, impurities, research and development chemicals, and non-isolated intermediates. The public comment period for that proposal ended on December 29, 2025. Based on the facts provided here, manufacturers should not treat the proposal itself as a substitute for checking the operative requirement that applied to their own reporting position.

Chemical Inventory Reporting Dates For PFAS

For Chemical Inventory Reporting teams, the timing is direct. Most manufacturers had to submit required TSCA PFAS data by October 13, 2026. Since today is October 27, 2026, that date has passed and should be reviewed as a completed compliance milestone. Small businesses that report solely as article importers have a later deadline of April 13, 2027.

That difference matters for document control. A company that both manufactures chemicals and imports articles may need to separate activities carefully before assuming the later date applies. The supported facts do not establish that all article-related activity receives the same treatment. They identify an extended deadline for small businesses reporting solely as article importers.

EPCRA Hazard Categories And SDS Evidence

EPA issued a final EPCRA Sections 311 and 312 rule on June 22, 2026, to align hazardous chemical inventory reporting under 40 CFR Part 370 with OSHA Hazard Communication Standard amendments from March 26, 2012, and May 20, 2024. The rule became effective on August 21, 2026, while the compliance date for using the new hazard categories in annual EPCRA Section 312 reports is January 1, 2028, affecting reports for calendar year 2027 due March 1, 2028, according to the Federal Register rule record.

This timing creates a transitional period. Reports for calendar year 2026, due on or before March 1, 2027, still use the earlier categories until the new categories apply in 2028. Facilities comparing Tier II fields with SDS data may also find our related discussion of EPCRA hazard categories useful where SDS classifications and inventory reporting need to be reconciled.

What Changed In Part 370

The EPCRA amendments revise hazard-category references rather than creating a new chemical list. The changes include replacing flammable aerosols with two hazard classes: aerosols and chemicals under pressure, both with multiple hazard categories. The rule also updates definitions of Safety Data Sheets, removes the term “Material Safety Data Sheet,” and includes combustible dusts as a health and physical hazard category consistent with OSHA standards.

For manufacturers, the central documentation issue is traceability. If an SDS was updated because OSHA HazCom classifications changed, the Tier II reporting basis should show which SDS version was used, when it was received or issued, and whether the hazard category in the facility inventory was updated. A facility does not need to invent a new hazard review method, but it does need to prevent older MSDS terminology, outdated SDS versions, and reporting categories from being mixed without review.

Why The 2028 Tier II Date Matters

The January 1, 2028 compliance date can appear distant, but the affected records are already being formed. The research notes state that facilities subject to EPCRA Sections 311 and 312 must update SDSs or lists when they receive significant new information. For substances, those updates occur between May 20, 2024, and May 19, 2026, and affect reporting periods from calendar year 2024 through the 2027 report due March 1, 2028. For mixtures, updated SDSs must follow OSHA’s HazCom Standard by November 19, 2027.

A manufacturer that waits until the 2027 Tier II report is being prepared may find that its inventory system, SDS library, and production records do not align. That is a documentation problem rather than a chemistry problem. The evidence file should show the basis for each hazard category used at the time of submission.

Practical Controls For Manufacturers

Manufacturers can reduce rework by treating TSCA PFAS reporting and EPCRA inventory reporting as related but separate workstreams. Both use chemical identity and record evidence, but the questions are different. TSCA asks about historical manufacture or import of PFAS and associated data. EPCRA focuses on hazardous chemicals present at facilities and the categories used for emergency planning and community right-to-know reporting.

Separate Substance, Mixture, And Article Questions

The research record distinguishes substances, mixtures, imported articles, impurities, research and development chemicals, and non-isolated intermediates in the PFAS proposal context. That distinction should also influence internal review. A single supplier item may raise more than one question: whether it contains a reportable substance, whether it is part of a mixture, whether it is imported as an article, and whether any exemption or deadline is actually supported by the rule text and company facts.

For EPCRA, the substance-versus-mixture distinction also matters because the OSHA-aligned SDS update dates differ. Substance SDS updates and mixture SDS updates do not share the same final date in the research notes. Treating them as one category can create a false sense that all SDS evidence is due on one schedule.

Keep Evidence Linked To The Reporting Basis

A defensible system does not depend only on an inventory export. It links each reportable decision to the evidence used at the time. That includes supplier SDSs, import records, product specifications, purchase histories, historical production records, and the final reporting interpretation approved by qualified personnel.

• Identify which records support PFAS manufacture or import activity since January 1, 2011.
• Separate most-manufacturer PFAS submissions from the April 13, 2027 small-business article-importer deadline.
• Track SDS version dates for substances and mixtures rather than relying on a single library update field.
• Map EPCRA categories to the hazard information actually available for the reporting year.
• Preserve the reason for any non-reporting decision, especially where a proposal or exemption is being considered.

These controls are procedural, not speculative. They do not predict how EPA will apply enforcement discretion in any individual case. They create a record that explains what the company knew, which deadline it used, and why the submission or non-submission position was chosen.

Chemical Inventory Reporting Control Points

The EPA amendments should be read as a documentation reset for chemical manufacturers. The TSCA PFAS rule required retrospective review, and for most manufacturers the October 13, 2026 submission date had passed by October 27, 2026. The later April 13, 2027 date applies only to small businesses reporting solely as article importers, based on the research provided.

On the EPCRA side, the August 21, 2026 effective date has passed, but the new hazard categories apply to annual Section 312 reports beginning January 1, 2028, affecting the calendar year 2027 reports due March 1, 2028. Reports for calendar year 2026, due on or before March 1, 2027, remain tied to the earlier category framework.

A defensible Chemical Inventory Reporting program should therefore keep three gates visible: historical PFAS evidence, SDS update evidence, and Tier II hazard-category evidence. The safest practical approach is to document each gate separately, reconcile overlaps, and avoid treating proposed exemptions or future category changes as if they had already resolved every facility-specific reporting question.