Prepared Feeds Manufacturing

Air Quality Permit Requirements

‌Owners and operators of air pollution sources, including prepared feeds manufacturers, are required to obtain air quality permits or utilize applicable exemptions to meet applicable air pollution standards.

Grain from a feed mill near floor vent.


In September 2014, the Iowa Department of Natural Resources (DNR) adopted the federal standard for the National Emission Standards for Hazardous Air Pollutants for Prepared Feeds Manufacturing at Area Sources 40 CFR 63 Subpart DDDDDDD, otherwise known as the 7D NESHAP. This regulation applies to facilities that manufacture prepared animal feed or additives for animal feed (sometimes known as a “feed mill”) and use materials (such as additives or pre-mixes) containing chromium or manganese.

Additional Resources

7D NESHAP Fact Sheet

7D NESHAP Initial Notification / Notification of Compliance Status Form

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.