When Air Emissions Trigger Federal TRI / Form R Reporting
A California facility filing its Annual Emissions Report (AER) with the local air district has already calculated the pounds of solvent, chromium, or cadmium released to the air last year.
A California facility filing its Annual Emissions Report (AER) with the local air district has already calculated the pounds of solvent, chromium, or cadmium released to the air last year. What many of those facilities don’t realize: the same numbers may also need to go on a federal Form R, the Toxics Release Inventory (TRI) submittal to EPA, by July 1.
The state air-district reporting and the federal TRI program are administered separately. The data overlaps. The deadlines, thresholds, and submittal portals do not. This piece covers when the two converge, and what to check before you assume your AER work is the end of your reporting year.
For a complete overview of state-side reporting, see our Annual Emissions Report (AER): California Requirements, Deadlines, and How to Prepare and AB 2588 Air Toxics “Hot Spots” Reporting Explained. For the federal program in full, see our TRI / Form R Reporting guide.
What Form R Actually Is
The Toxics Release Inventory is a federal program under the Emergency Planning and Community Right-to-Know Act (EPCRA), Section 313. Facilities that meet three tests must file:
The facility is in a covered industry (most manufacturing North American Industry Classification System (NAICS) codes in the 31–33 range, plus electric utilities, metal mining, hazardous waste treatment, and certain wholesalers).
The facility had 10 or more full-time-equivalent employees during the reporting year (20,000 hours total).
The facility manufactured, processed, or otherwise used a listed toxic chemical above the applicable threshold during the calendar year.
Standard thresholds are 25,000 pounds manufactured or processed, or 10,000 pounds otherwise used. Persistent bioaccumulative toxic (PBT) chemicals have lower thresholds, some as low as 0.1 grams for dioxin compounds.
Form R (or the abbreviated Form A, for low-volume releases) reports the chemical’s releases across all media: fugitive air, stack air, surface water, underground injection, on-site land disposal, and off-site transfers. The report is filed in EPA’s TRI-MEweb portal and is due July 1 each year for the prior calendar year.
Where Air District Reporting and Form R Overlap
The overlap is real but partial. AER and AB 2588 report what you released to the air, organized around your air-district permits. Form R reports what you used (manufactured, processed, or otherwise used) and where it ended up, organized around EPA’s list of about 800 listed chemicals.
A facility can be on the hook for AER and not Form R (small employee count, or chemicals not on the TRI list). It can be on the hook for Form R and not AER (the chemical is below district reporting thresholds but exceeds the federal usage threshold). And it can be on the hook for both, with the same air-emission number flowing into two different reports.
Quick Overlap Reference
| Reporting Item | California AER | Federal Form R (TRI) |
|---|---|---|
| Trigger basis | Air-district notification list; permitted sources; emission thresholds (under SCAQMD Rule 301(e), 4+ tons of listed criteria pollutants or 100+ tons CO, plus AB 2588 or CTR applicability and district-specific toxic air contaminant (TAC) reporting criteria) | Covered NAICS code + 10+ FTE + chemical use over 25,000 lb / 10,000 lb / PBT threshold |
| What’s reported | Air emissions only, by source/permit | All media releases (air, water, land), plus off-site transfers, by chemical |
| Common overlap chemicals | Volatile organic compounds (VOCs) such as toluene, xylene, methyl ethyl ketone (MEK), and isopropyl alcohol (IPA); hexavalent chromium, cadmium, nickel, lead, methylene chloride | Same VOCs and metals when over usage thresholds; PBTs (lead, mercury, dioxins) almost always trigger |
| Filed with | Local air district (SCAQMD, BAAQMD, SJVAPCD, etc.) | EPA via TRI-MEweb |
| Deadline | District-specific, not uniform statewide (SCAQMD’s Data Year 2025 deadline is May 1, 2026) | July 1 (for the prior reporting year) |
| Public disclosure | Air-district records | Yes: published in EPA’s public TRI database |
When we walk a California metal-finishing or plating facility, the chemicals that show up on the AER are often the same ones that drive a Form R obligation. Hexavalent chromium, cadmium, nickel from heated tanks, and lead from solder operations all carry TRI thresholds: 100 lb for lead, 10 lb for mercury, 25,000 lb manufactured or processed, and 10,000 lb otherwise used for non-PBT chemicals. Coating shops show the same pattern with toluene, MEK, and methylene chloride.
Why Facilities Miss the Federal Side
Three patterns we see in the field:
One. The facility files AER every year and assumes that satisfies “the reporting.” It does not. The air district doesn’t pass data to EPA. Form R is a separate filing on a separate deadline through a separate portal.
Two. The facility crossed the 10-FTE threshold or expanded production and didn’t reassess Form R applicability. EPCRA 313 thresholds are calendar-year tests. A facility that was exempt in 2023 (eight employees, low throughput) may have triggered in 2024 (twelve employees, full-rate production) without anyone running the math.
Three. The facility is a chemical distributor or wholesaler that thought TRI was only for manufacturers. Certain wholesaler NAICS codes (chemical and allied products) are TRI-covered. Hazardous waste treatment, storage, and disposal facilities are covered. Metal mining and coal mining are covered. The list is broader than the “factory” mental model suggests.
What to Check Before You Assume You’re Done
If your facility files AER or AB 2588, run a short checklist before closing out the reporting year:
- NAICS code review. Confirm the facility’s primary NAICS code. If it’s in 31–33 (manufacturing) or another TRI-covered sector, you’re past the first test.
- Employee count. Total FTE hours during the year. 20,000 hours or more triggers the second test, regardless of headcount snapshot.
- Chemical usage totals. For every chemical you reported on AER, check the year’s full usage (manufactured, processed, or otherwise used) against the EPCRA 313 threshold for that chemical. The PBT list (lead, mercury, certain dioxins, polycyclic aromatic compounds, hexachlorobenzene) uses lower thresholds.
- Other-media releases. Form R covers more than air. Wastewater discharges, on-site treatment, and off-site shipments of TRI-listed chemicals all count. Pull waste manifests and discharge records.
- Prior-year Form R filings. If you filed for a chemical last year but do not file this year, keep a documented threshold determination showing why the chemical no longer met TRI criteria.
- Watch for chemicals added to the TRI list. The list of TRI-reportable chemicals changes over time. EPA has added a number of PFAS (per- and polyfluoroalkyl substances) for recent reporting years, and PFAS additions carry low reporting thresholds. A chemical that was not reportable a few years ago may be reportable now, so re-check the current list rather than relying on a past determination.
A clean AER doesn’t tell you whether Form R applies. It tells you what you put into the air, which is one input. Form R asks a different question.
How CDMS Handles the Overlap
For California facilities we serve on AER or AB 2588, we check Form R applicability as part of the same data review. The chemical usage data, throughput records, and material invoices we collect for AER are the same data Form R needs. Once it’s compiled, running the EPCRA 313 thresholds takes a fraction of the time of building the dataset from scratch.
If Form R applies, we prepare and file it through TRI-MEweb on the federal deadline. If it doesn’t apply, you get a documented determination, which is what an EPA inspector will ask for if your facility ever ends up on a compliance review.
For more on how CDMS supports California air programs end to end, see our air quality compliance services overview.
Trusted throughout California
BSY started working with CDMS last year after our in-house EHS person departed the company. CDMS reviewed our existing operational permits as well as any additional Federal, State and Local regulations that could apply and helped us to create a comprehensive compliance calendar to track regulatory deadlines and submittal due dates. The CDMS team does an excellent job of tracking everything and can be relied upon to complete the forms accurately and assist with submittals, allowing me to focus on our business.
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