Illinois
For Illinois, general hazardous chemical threshold is 10,000 pounds or more; ehs threshold is 500 pounds or the threshold planning quantity (TPQ), whichever is less; filing deadline is March 1; citation is 430 ILCS 100; 29 Ill. Adm. Code 620, recorded from its source on 2026-09-22.
- State
- Illinois
- General hazardous chemical threshold
- 10,000 pounds or more verified
- EHS threshold
- 500 pounds or the threshold planning quantity (TPQ), whichever is less verified
- Filing deadline
- March 1 verified
- Citation
- 430 ILCS 100; 29 Ill. Adm. Code 620 our reading
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
If the chemical is hazardous, the threshold quantity is 10,000 pounds or more.
— iemaohs.illinois.gov, retrieved 2026-09-22
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
General hazardous chemical threshold
If the chemical is hazardous, the threshold quantity is 10,000 pounds or more.
EHS threshold
If the chemical is an extremely hazardous substance (EHS), the threshold is 500 pounds or the threshold planning quantity (TPQ), whichever is less.
Filing deadline
The emergency and hazardous chemical inventory form (“Tier II Form”) is due annually on or before March 1 of the year following the reporting calendar year period.
Citation
LAW Illinois Emergency Planning and Community Right to Know Act (IEPCRA) 430 ILCS 100; 29 Ill. Adm. Code 620
— all from iemaohs.illinois.gov, retrieved 2026-09-22
Source
- iemaohs.illinois.govhttps://iemaohs.illinois.gov/preparedness/serc/chemical-inventory-reporting-requirements.html