Wisconsin Tier II reporting: how and where to file
Wisconsin files online in WHOPRS, the Wisconsin Hazmat Online Planning and Reporting System, after registering.
From Wisconsin Emergency Management, EPCRA Facility Reporting and Planning Section, read on the state's own page · September 26, 2026
What Wisconsin asks for
Each point below is followed by the state's own words, so you can check it against the 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 Wisconsin'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.
Wisconsin Tier II FAQ
How do I file Tier II in Wisconsin?
Wisconsin files online in WHOPRS, the Wisconsin Hazmat Online Planning and Reporting System, after registering.
More on Wisconsin
Tier II in other states
Sources
Wisconsin'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 Wisconsin Emergency Management, EPCRA Facility Reporting and Planning Section before you file. General guidance, not legal advice.
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OSHA does not give advance notice of inspections (29 CFR 1903.6). Get the binder in order before the opening conference, not during it.
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