Grain Elevators

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Iowa DNR


Air Quality Permit Requirements

Owners and operators of air pollution sources, including grain elevators, are required to obtain permits and meet applicable air pollution standards. With the passage of the 1990 amendments to the federal Clean Air Act a new operating permit program for major sources of regulated air pollutants was created. As a result, the EPA required the state to remove restrictions limiting the regulation of grain elevators which necessitated that the Iowa Department of Natural Resources (DNR) review and permit air emissions at hundreds of grain elevators to bring them into compliance with the air construction permitting requirements of rule 567-22.10(455B). The grain elevators’ potential to emit (PTE) determines the group classification, associated reporting and/or permitting requirements.

Group 1 registrations, Group 2 permit templates, and Group 3 or 4 permit applications must be submitted electronically in Iowa EASY Air.

hands holding phone with GrainPTE web app on screen


To help owners and operators of grain elevators determine their classification and manage records, the IWRC's Iowa Air Emissions Assistance Program developed the GrainPTE online calculation tool.

Features of GrainPTE

  • It’s FREE
  • Easily record facility information and calculate PM10 PTE.
  • Track multiple facilities in the same place.
  • Maintain records in one location for easy retrieval.
  • Comply with the requirements of 567 IAC 22.10.

These resources and information have been developed by the Iowa Air Emissions Assistance Program, a program focused on training and educating Iowa small businesses with less than 100 employees. The Iowa Air Emissions Assistance Program is funded by the Iowa Department of Natural Resources. This information is intended solely as guidance, cannot be used to bind the Iowa Department of Natural Resources and is not a substitute for reading applicable statutes and regulations.