Exemptions are listed in the DNR's administrative rules; they are found in subrule 22.1(2) of 567 IAC.
The administrative rules can be easily accessed on the Internet at https://www.legis.iowa.gov/
by following the following steps:
- Under Popular Publications, click on "Iowa Administrative Code"
- The agency is "Natural Resources Department " - "Environmental Protection Commission "
- Chapter 22 (Controlling Pollution), Click on "pdf" or "rules"
- Exemptions are listed at the beginning of the chapter under 22.1(2)
A hard copy of the administrative rules may also be obtained at the DNR records center. If you questions on any of the exemptions, call 1-877-AIR-IOWA (1-877-247-4692).