File a Tier II chemical inventory by March 1 each year (reporting window opens January 1) if any hazardous chemical is on site at 10,000 lb or more, or an Extremely Hazardous Substance at 500 lb or its TPQ, whichever is lower. Fees: $75 first facility, $20 each additional, $500 cap.
az-regulatory §EPCRA §312 Tier II (ADEQ myDEQ)
- When it applies
- Chemical/gas sites; most warehouses (forklift batteries, solvents) and CDS integrators.
- Evidence you'd show
- Registration
- How often
- Every year
- If it isn't met
- Federal/state penalties; first responders rely on the filing.
az-regulatory v1 §EPCRA §312 Tier II (ADEQ myDEQ) — verify against the source
Verified against source on 2026-09-07 · Source version: 2026 calendar
Verify against the source — requirements change.
https://azdeq.gov/TierII