# Illinois — EPCRA Tier II hazardous chemical inventory reporting thresholds by state

For Illinois, general hazardous chemical threshold is 10,000 pounds (federal); ehs threshold is 500 pounds or the TPQ, whichever is lower (federal); special categories or chemicals is Uses the state-managed SERC portal with specific formatting expectations for site maps; report name is Tier II; filing deadline is March 1, recorded from its source on 2026-08-15.

- **State:** Illinois _(verified: appears in the quote below)_
- **General hazardous chemical threshold:** 10,000 pounds (federal)
- **EHS threshold:** 500 pounds or the TPQ, whichever is lower (federal)
- **Special categories or chemicals:** Uses the state-managed SERC portal with specific formatting expectations for site maps _(verified: appears in the quote below)_
- **Report name:** Tier II
- **Filing deadline:** March 1 _(our reading, not quoted from the source)_

## What the source says

> Illinois: Uses the state-managed SERC portal with specific formatting expectations for site maps.

## Source

- https://edge-es.com/epcra-tier-ii-reporting-state-by-state-requirements/

Last verified: 2026-08-15. Review by: 2027-08-15.
Part of [EPCRA Tier II hazardous chemical inventory reporting thresholds by state](https://referencesource.org/epcra-tier-ii-state-reporting-thresholds/).