Free Tier II Threshold Checker
Do you need to file EPCRA Tier II? Enter your chemicals and the most you had on site at any one time. The checker flags Extremely Hazardous Substances (500 lb or their TPQ) and other hazardous chemicals (10,000 lb), and converts gallons to pounds. No account required.
Last updated
Next filing due March 1, 2027, covering calendar year 2026
Not on the Extremely Hazardous Substances list? It is checked against the 10,000 lb threshold for hazardous chemicals (anything with an SDS).
Enter a chemical and an amount to check it
Federal thresholds only. Your state may be lower.
⚠ Important — Read before you print
- This tool is provided as a utility only, on an "as is" basis, with no warranty of accuracy, completeness, or fitness for any particular purpose.
- It is not legal, regulatory, or EHS advice. You are solely responsible for verifying that any label you generate is accurate and complete for your specific product and use.
- You must ensure compliance with OSHA HCS 2024 (29 CFR 1910.1200) and any other applicable federal, state, local, or international regulations (e.g. DOT, EPA, GHS Rev.10).
- Always cross-check generated content against the manufacturer's current Safety Data Sheet (SDS).
- Tellus EHS, Inc. and its affiliates are not liable for any damages, injuries, fines, or losses arising from use of this tool or any label generated by it.
See the full Free Tool Terms & Disclaimer.
Quantities change every month
Tellus keeps your chemical inventory by site and flags Tier II and Extremely Hazardous Substance thresholds as quantities change, so March 1 isn’t a scramble through purchase records.
Get Started Free — no credit card requiredTier II reporting thresholds
Hazardous chemicals
40 CFR 370.10
10,000 lb or more present at any one time. Covers any chemical that needs an SDS under OSHA’s Hazard Communication Standard.
Extremely Hazardous Substances
40 CFR 370.10
500 lb or the Threshold Planning Quantity, whichever is lower. Some EHS thresholds are as low as 1 lb.
Retail gas stations
40 CFR 370.10
75,000 gallons of gasoline and 100,000 gallons of diesel, when stored entirely underground at a retail station.
How to check whether you need to file Tier II
- 1
List your chemicals
Enter each hazardous chemical or product at the facility, by name or CAS number. Extremely Hazardous Substances are recognized automatically.
- 2
Enter the maximum amount
Use the largest amount on site at any one time during the year, totaled across all containers and locations at the facility, in pounds, kilograms, gallons, or liters.
- 3
Add density for liquids
For gallons or liters, enter the specific gravity from SDS Section 9 so volume converts to pounds correctly. For an EHS in a mixture, enter its percentage.
- 4
Read the result
Each chemical shows its weight in pounds, its threshold, and whether it is over, near, or under. Download the report as a PDF if you want to keep it.
Frequently asked questions
What are the Tier II reporting thresholds?+
Federally (40 CFR 370.10), you must report an OSHA hazardous chemical present at 10,000 pounds or more at any one time, and an Extremely Hazardous Substance (EHS) present at 500 pounds or its Threshold Planning Quantity (TPQ), whichever is lower. Retail gas stations have higher thresholds for gasoline (75,000 gallons) and diesel (100,000 gallons) stored entirely underground.
When is the Tier II report due?+
March 1 every year, covering the previous calendar year. It goes to your State Emergency Response Commission, your Local Emergency Planning Committee, and your local fire department, usually through your state’s online system or EPA’s Tier2 Submit.
How do I count a chemical that is in several containers or mixtures?+
Add up the maximum amount present at the facility at any one time, across all containers and locations. For an EHS in a mixture, count only the EHS portion (amount × its percentage). For other hazardous chemicals in a mixture, you can report the mixture as a whole or by component.
Do lead-acid batteries count for Tier II?+
Often, yes. Sulfuric acid is an EHS with a 500 lb Tier II threshold, and forklift or backup-power batteries can hold a lot of it. Count the sulfuric acid inside the batteries, from the battery’s SDS, toward the 500 lb threshold.
Are state thresholds different?+
Some are lower. California’s Hazardous Materials Business Plan program, for example, starts at 55 gallons of a liquid, 500 pounds of a solid, or 200 cubic feet of a compressed gas. Check your state’s rules; this tool uses the federal thresholds.
What is an Extremely Hazardous Substance (EHS)?+
A chemical on EPA’s EPCRA Section 302 list (40 CFR 355 Appendix A), such as ammonia, chlorine, sulfuric acid, nitric acid, formaldehyde, and hydrogen fluoride. Each has a Threshold Planning Quantity. Having an EHS at or above its TPQ also requires a one-time emergency planning notification to your SERC and LEPC within 60 days.
Is this tool free?+
Yes. Check as many chemicals as you need with no account and no payment. Your list is not stored unless you download the report.