Ultimate Chemical Inventory: OSHA & Tier II Template

The One-List Solution

For safety managers, maintaining separate chemical lists for OSHA compliance and EPA Tier II reporting is a waste of time and a recipe for error. The "Ultimate Chemical Inventory" is a single, master dataset that satisfies the requirements of both the OSHA Hazard Communication Standard (29 CFR 1910.1200) and the EPA's Emergency Planning and Community Right-to-Know Act (EPCRA).

At a glance: One master inventory feeds two reports — OSHA's hazardous-chemical list (1910.1200(e)(1)(i)) and EPA EPCRA Tier II (due March 1). Capture identity, CAS, location, max/avg quantity, physical state, and hazard class once. Tier II thresholds: 10,000 lbs general, 500 lbs or TPQ for Extremely Hazardous Substances. Archive, never delete (30-yr rule, 1910.1020). A single master chemical inventory can satisfy both the OSHA hazard-communication list requirement and EPA EPCRA Tier II reporting, which is due March 1 when a chemical exceeds 10,000 pounds or 500 pounds for an extremely hazardous substance.

The two regimes now share one vocabulary. EPA's final rule of June 22, 2026 (91 FR 37022) conformed the EPCRA inventory rules in 40 CFR part 370 to OSHA's HCS 2024, after a November 2025 direct final rule was withdrawn on January 9, 2026 (91 FR 918). The hazard categories in 40 CFR 370.2 are the hazard classes reported in Section 2 of the SDS, so the classification you capture for HazCom is the one Tier II asks for.

Essential Data Fields for the Template

To build a compliant master inventory, your spreadsheet must capture specific fields that feed into both regulatory reports.

1. Identity & Location

• Product Identifier: Must match the SDS exactly (OSHA requirement).
• CAS Number: Critical for screening against the EPA's List of Lists for Extremely Hazardous Substances (EHS).
• Storage Location: Specificity matters. "Site Layout Zone 4" is better than "Jobsite."

2. Quantities (The Tier II Trigger)

• Max Daily Amount (lbs): The highest inventory level reached at any point in the year.
• Average Daily Amount (lbs): The weighted average.
• Container Type: (e.g., Drum, Tote, Cylinder).
• Physical State: (Solid, Liquid, Gas).

3. Hazard Classifications (The New Standard)

The old "Five Hazard Categories" (Fire, Sudden Release of Pressure, Reactivity, Immediate/Acute Health, Delayed/Chronic Health) are gone: the Tier II form EPA has used since reporting year 2017 lists OSHA's physical and health hazard classes, and since the June 22, 2026 final rule, 40 CFR 370.2 also covers the HCS 2024 additions, such as chemicals under pressure and desensitized explosives. Use the 2017 to 2026 form for the report due March 1, 2027, and EPA's new form from calendar year 2027 (report due March 1, 2028). Capture each product's classes from SDS Section 2 and the template feeds both reports.

• Physical Hazards: Flammable Liquid (Cat 2), Oxidizing Solid (Cat 1), Aerosol (Cat 3).
• Health Hazards: Carcinogenicity (Cat 1A), Skin Corrosion (Cat 1B), Specific Target Organ Toxicity.

Reporting Thresholds: When to Report?

For construction sites, the 2026 reporting thresholds are the triggers that turn a simple inventory list into a mandatory federal report:

• 10,000 lbs: The general threshold for hazardous chemicals (e.g., diesel fuel, bulk cement), under 40 CFR 370.10(a)(2)(i).
• 500 lbs (or TPQ): The threshold for Extremely Hazardous Substances (EHS). If you store Sulfuric Acid (batteries) or Ammonia, the threshold is 500 lbs or the Threshold Planning Quantity (TPQ), whichever is lower (40 CFR 370.10(a)(1)).
• Gasoline and diesel, general rule: 10,000 lbs, like any other hazardous chemical (40 CFR 370.10(a)(2)(i)). That is the threshold for a fleet depot or a jobsite fuel tank.
• Gasoline and diesel at a retail gas station: 75,000 gallons of gasoline and 100,000 gallons of diesel, but only at a retail facility selling fuel principally to the public for motor vehicle use, and only for fuel in tanks entirely underground that met all applicable UST requirements (40 CFR part 280, or an approved state program under part 281) throughout the preceding calendar year (40 CFR 370.10(a)(2)(ii)-(iii)).

The "Gap Analysis" Column

Add a column to your template for "Compliance Status." This serves as your internal audit tool.

• SDS on file: Do you have the current manufacturer SDS? (OSHA sets no expiration date; replace it when the manufacturer issues an updated version.)
• GHS Rev: Is the hazard classification based on Rev 7?
• Signal Word: Is it "Danger" or "Warning"?

Best Practices for Maintenance

An inventory is a living document.

• Gatekeeping: No chemical enters the site without being logged.
• Monthly Audits: Conduct spot checks. If you find a drum of solvent on the site that isn't on the list, your system has failed.
• Archive Mode: Never delete a chemical from the list. Move it to an "Archived" tab. OSHA requires access to exposure records for 30 years.

By maintaining this "Ultimate Template," you turn the panic of the March 1st deadline (40 CFR 370.45(a)) into a simple export task, from the same inventory that runs your HazCom program.

Related: Chemical Inventory Template · SDS Gap Analyzer · Find the Holes: SDS Gap Audit · Write a HazCom Program in 10 Minutes · HazCom Standard 1910.1200

Sources & verification (read on the eCFR and epa.gov, October 5, 2026): OSHA Hazard Communication list requirement, 29 CFR 1910.1200(e)(1)(i); record retention per 29 CFR 1910.1020 (30 years); EPA EPCRA Section 312 thresholds per 40 CFR 370.10(a) (10,000 lbs general; 500 lbs or TPQ for Extremely Hazardous Substances; retail-fuel UST 75,000 gal gasoline / 100,000 gal diesel), hazard categories per 40 CFR 370.2, and the March 1 deadline per 40 CFR 370.40(a) and 370.45(a); EPA's final conforming rule of June 22, 2026 (91 FR 37022), the withdrawal of the November 2025 direct final rule (91 FR 918), and the Tier II form schedule on epa.gov. Verify your State/LEPC requirements. Not legal advice.