Iowa Tier II reporting: how and where to file
The state accepts Tier II only through E-Plan. Due March 1 each year.
From Iowa Department of Natural Resources (Iowa DNR), for the SERC, read on the state's own page · September 26, 2026
What Iowa asks for
Each point below is followed by the state's own words, so you can check it against the source.
How to file
The state accepts Tier II only through E-Plan.
“SERC: The State of Iowa only accepts Tier 2 submissions through E-Plan.” source
Deadline
Due March 1 each year.
“Tier 2 reporting (Section 312) is an annual hazardous chemical inventory form due March 1 each year.” source
Who gets the report
Each county's LEPC says how it wants the report, and Iowa lists the fire departments that need no separate copy.
“The following fire departments have identified that they don't need a separate submission from E-Plan.” source
State-specific rule
A Tier II filed during January 1 to March 1 can double as the one-time section 311 notice when it falls within the three-month window.
“If the Tier 2 reporting period (January 1 - March 1) falls within the three-month 311 notification window, a Tier 2 can satisfy the notification requirement.” source
The federal rule underneath
EPCRA section 312 applies to a facility that the OSHA HazCom Standard requires to keep an SDS for a hazardous chemical present at any one time at or above 10,000 lb, or at or above 500 lb or its threshold planning quantity, whichever is lower, for an extremely hazardous substance (40 CFR 370.10(a)). The report covers the previous calendar year and is due March 1 (40 CFR 370.45). Where Iowa's rules above are stricter, they apply on top.
The full federal picture, Tier I versus Tier II, counting and penalties, is on the EPCRA Tier II hub. The list that feeds it is the chemical inventory.
HazComFast keeps each jobsite's chemical quantities next to its safety data sheets and exports the Tier II data as an Excel workbook, a CSV file and a PDF summary.
Iowa Tier II FAQ
How do I file Tier II in Iowa?
The state accepts Tier II only through E-Plan.
When is Tier II due in Iowa?
Due March 1 each year.
Do I still send the report to the LEPC and fire department in Iowa?
Each county's LEPC says how it wants the report, and Iowa lists the fire departments that need no separate copy.
More on Iowa
Tier II in other states
Sources
- www.iowadnr.gov/environmental-protection/spills-emergency-planning/chemical-inventory-reporting
- ecfr.gov/current/title-40/part-370
Iowa's requirements read on the state's own page on September 26, 2026; 40 CFR part 370 read on the eCFR the same day. States change portals and fees; confirm with Iowa Department of Natural Resources (Iowa DNR), for the SERC before you file. General guidance, not legal advice.
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