Free tools / EPCRA Tier II Checker / Checker
Check a chemical against the Tier II threshold.
Type the chemical name, CAS number, or common alias (NH3, HCl, H2SO4). Enter your peak inventory in pounds. The checker tells you whether the chemical is an Extremely Hazardous Substance, what its TPQ is, and whether your inventory triggers the form. Your answers stay in your browser.
Loading the interactive checker… if this doesn't replace itself within a second, your browser may have JavaScript disabled. The threshold reference covers the rules without JS.
Data: 50 most-common EHS entries from 40 CFR Part 355 Appendix A. Universal 10,000-pound hazardous-chemical threshold applies to anything else requiring an SDS.