Tier II Chemical Reporting in Connecticut: Who Files & How
Short answer: if your Connecticut facility stores a hazardous chemical at or above its EPCRA reporting threshold — generally 10,000 pounds, or as low as 500 pounds for an Extremely Hazardous Substance — you must file an annual Tier II chemical-inventory report by March 1, covering the prior calendar year. It goes to your State Emergency Response Commission (SERC), your Local Emergency Planning Committee (LEPC), and your local fire department. In Connecticut you file through the Hazconnect Tier II Manager used by the State Emergency Response Commission and the Department of Energy and Environmental Protection (DEEP), then send your own local copies. The hardest part is compiling an accurate inventory with quantities — which is exactly what SDSentry ($24 per location per month) keeps current for you year-round. Here is how Tier II works in Connecticut.
Free, no signup: the SDS binder builder at sdsentry.0xpi.com/sds-binder.html turns a pasted list of the products you keep on site into one printable index of their current safety data sheets.
What Tier II is (and isn't)
Tier II is the annual chemical-inventory report required under Section 312 of the Emergency Planning and Community Right-to-Know Act (EPCRA). Its purpose is to tell fire departments and emergency planners what hazardous chemicals are stored at your facility, in what quantities, and where, so responders know what they are walking into. It is a separate obligation from OSHA Hazard Communication — the same chemicals on your shelves, but a different law and a different audience. Meeting your HazCom duties does not satisfy Tier II, and vice versa.
Who has to file in Connecticut
The trigger is federal and applies the same way in Connecticut as everywhere else. You must file Tier II if any hazardous chemical for which you are required to keep a safety data sheet is present at your facility at or above its reporting threshold at any point during the year:
- 10,000 lbs for most hazardous chemicals (those that require an SDS).
- 500 lbs — or the chemical's Threshold Planning Quantity, 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. A small clinic or shelter often stays under these limits, but bulk propane or diesel tanks, stored fuel, pool and spa chemicals, fertilizer, or a large supply of a single disinfectant can push you over — and EHS thresholds are low enough that a modest amount of the wrong chemical can trigger a report.
Where Connecticut facilities submit
EPCRA sends every Tier II report to three places: your State Emergency Response Commission (SERC), your Local Emergency Planning Committee (LEPC), and your local fire department.
Connecticut's SERC: “The Connecticut State Emergency Response Commission and the Department of Energy and Environmental Protection uses the Hazconnect® Tier II Manager system to manage EPCRA Tier II chemical inventory reports due March 1 of each year.” Tier2 Submit files emailed to DEEP.CTEPCRA@ct.gov are accepted only when unique circumstances prevent use of Hazconnect. DEEP also “requires a description of the precise locations of the hazardous chemicals at your facility, including a site plan.”
Hazconnect covers only the state: “Facilities are still required to directly submit reports to their Local Emergency Planning Committee and local Fire Department, with Site Plan and SDS attachments.” Connecticut also has two separate state reporting duties that are not part of EPCRA: an annual carcinogenic substance report under CGS 19a-330 for manufacturers that use or produce carcinogens, and CGS 29-307a, under which manufacturing establishments must notify the local fire marshal within thirty days of the presence or elimination of any hazardous material. Start from the Connecticut SERC reporting requirements page.
State systems and instructions can change year to year, so confirm current details with DEEP (DEEP.CTEPCRA@ct.gov) before you file.
The deadline
Connecticut SERC: “For each reporting year (January 1 through December 31), the Tier II Form is due no later than March 1 of the following year.”
Are there Connecticut state fees?
The SERC describes Hazconnect as “the free Hazconnect® Tier II Manager system,” and we found no Tier II filing fee on Connecticut's SERC pages. That is not an explicit “no fee” statement, so confirm with DEEP if it matters to you.
What to have ready before you file
The report itself is mostly a structured list. What slows people down is assembling accurate underlying data. Before you start, have on hand:
- A complete chemical inventory for the location, with the product name and chemical identity for each item.
- The maximum quantity on site during the year and the average daily quantity, with units.
- Storage details — container type, pressure, temperature, and the specific location or building.
- Hazard information from each product's safety data sheet.
- Facility identifiers, emergency contacts, and (where required) latitude and longitude.
If you keep a current SDS library and a per-location inventory with quantities throughout the year, the February scramble largely disappears. See our guide on building a chemical inventory from scratch for a starting point.
How SDSentry helps
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 keeps a current SDS on file for every product, which is where most of the hazard and storage details on the report come from. It will not submit the report for you — you still file through Hazconnect — but it turns the worst part, compiling and maintaining the data, into a download. Pair it with our HazCom compliance checklist so your OSHA and EPCRA obligations stay covered at the same time.
Track inventory for Tier II — free trial
Frequently asked questions
Who do I send my Tier II report to in Connecticut?
File through the Hazconnect Tier II Manager used by the Connecticut SERC and DEEP, with a site plan describing chemical locations. You must also submit the report directly to your LEPC and local fire department, with site plan and SDS attachments.
When is the Tier II deadline in Connecticut?
By March 1 each year for the previous January 1 to December 31 reporting year.
What are the Tier II reporting thresholds?
You report if a hazardous chemical that requires a safety data sheet is on site at or above 10,000 pounds at any time during the year, or at or above 500 pounds — or the Threshold Planning Quantity, whichever is lower — for an Extremely Hazardous Substance. Quantities are the maximum amount present at any one time.
Is there a Connecticut state fee for Tier II?
The Connecticut SERC calls Hazconnect a free system and its pages list no Tier II filing fee, but there is no explicit no-fee statement; confirm with DEEP.