Tier II Chemical Reporting in Illinois: Who Files and How

Short answer: if your Illinois facility stored a hazardous chemical at or above its EPCRA reporting threshold — generally 10,000 pounds, or as low as 500 pounds (or the Threshold Planning Quantity, whichever is lower) for an Extremely Hazardous Substance — at any point last year, you must file an annual Tier II chemical inventory report by March 1. In Illinois the State Emergency Response Commission role is administered by the Illinois Emergency Management Agency (IEMA), and your report also goes to your Local Emergency Planning Committee (LEPC) and your local fire department. The hard part is compiling an accurate, quantity-tracked inventory — that is exactly what SDSentry ($24.99 per location per month) is built to keep ready. Here is how it works.

What Tier II is (and what it is not)

Tier II is an annual chemical-inventory report required under the federal Emergency Planning and Community Right-to-Know Act (EPCRA, Section 312). Its purpose is to tell emergency responders and community planners what hazardous chemicals are stored at your facility, in what quantities, and where on site — so a fire department arriving at 2 a.m. knows what it is dealing with. It is separate from OSHA Hazard Communication: the same chemicals are involved, but HazCom protects your employees while Tier II informs outside responders. Filing one does not satisfy the other.

Who has to file in Illinois

The trigger is the same in Illinois as everywhere else, because the thresholds are set by federal EPCRA. Any facility that is required to keep a safety data sheet for a hazardous chemical must file Tier II if that chemical was on site at or above its reporting threshold at any one time during the calendar year:

• 10,000 lbs for most hazardous chemicals (those that require an SDS).
• 500 lbs — or the chemical's Threshold Planning Quantity (TPQ), whichever is lower — for Extremely Hazardous Substances (EHSs) on EPA's list.

Quantities are based on the maximum amount present at any one time, aggregated across the facility — not the amount on hand on any given day. A tank that was briefly topped off counts at its peak.

The deadline: March 1

EPCRA sets a federal annual deadline of March 1, covering the previous calendar year, and Illinois follows that federal date. So a report covering 2026 is due by March 1, 2027. Build the habit of reconciling your inventory in January, while the prior year's purchasing records are fresh, rather than scrambling in late February.

Where the report goes in Illinois

Federal EPCRA requires a Tier II report to reach three recipients: the State Emergency Response Commission (SERC), the Local Emergency Planning Committee (LEPC) for your facility's area, and your local fire department. In Illinois, the SERC function is administered by the Illinois Emergency Management Agency (IEMA). File your Tier II report electronically through the Tier II Manager Online Filing System, which IEMA provides for Illinois submissions. You can reach it from IEMA's SERC Tier II page at iemaohs.illinois.gov/preparedness/serc/serc-tier2.html. Filing details can change from year to year, so confirm the current process and any requirements with IEMA before you submit.

Do not skip the local recipients. Even where the state collects the data electronically, your LEPC and fire department remain statutory recipients under EPCRA, and a friendly relationship with your local fire department is worth having regardless.

Are there Illinois state fees?

Some states charge a Tier II filing fee or facility fee and some do not, and amounts and rules change over time. We are not listing a specific Illinois fee figure here, because publishing an unverified dollar amount would do more harm than good. Confirm whether any fee currently applies — and how it is calculated and paid — directly with IEMA when you file through the Tier II Manager Online Filing System.

Do small facilities usually hit the threshold?

Often not. A typical clinic, shelter, shop, or office stocks cleaning and disinfection products in quantities well under 10,000 lbs. But the things that add up are worth checking: bulk pool or spa chemicals, large propane or diesel tanks, stored fuel, fertilizer, or a sizeable bulk supply of a single disinfectant. EHSs carry much lower thresholds, so a relatively small amount of the wrong chemical — chlorine, certain acids, anhydrous ammonia — can trigger reporting on its own. The only way to know is to track your quantities year-round.

How SDSentry helps an Illinois facility stay ready

SDSentry tracks quantity and unit per item in your per-location inventory, flags items over a threshold you set, and exports an EPCRA Tier II CSV — so your preparer is not rebuilding the inventory by hand each February. It will not file with IEMA for you, but it turns the worst part of the job (assembling accurate, current data) into a download, and it keeps the underlying SDS library current for HazCom at the same time. Pair this with our EPCRA Tier II overview to confirm whether you cross a threshold at all.

Track inventory for Tier II — free trial

Educational information only, not legal or compliance advice. Thresholds, deadlines, filing methods, and any state fees change — verify the current Illinois requirements directly with the Illinois Emergency Management Agency (IEMA) and with EPA's EPCRA resources at epa.gov/epcra, and consult a qualified professional for your specific facility.