PRESS RELEASE: IWRC offers free training for minor source emissions inventory

Purple and Gray header with IWRC and UNI Business and Community Services Logo


January 25, 2024

IWRC offers free training for minor source emissions inventory


CEDAR FALLS, Iowa - Businesses classified by the Iowa Department of Natural Resources (DNR) as minor sources in counties throughout the western portion of the state may be required to submit the Minor Source Emissions Inventory (MSEI) by May 15, 2023. Counties in Western Iowa include: Adair, Adams, Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee, Clay, Crawford, Dickinson, Emmet, Fremont, Greene, Guthrie, Harrison, Ida, Lyon, Mills, Monona, Montgomery, O’Brien, Osceola, Page, Palo Alto, Plymouth, Pocahontas, Pottawattamie, Ringgold, Sac, Shelby, Sioux, Taylor, Union and Woodbury. If your facility is subject, you should have received notification from the DNR. 

To assist with completing the inventories, the Iowa Air Emissions Assistance Program (IAEAP), funded by the DNR, at the Iowa Waste Reduction Center (IWRC) has provided resources and calculators since 2010 via

The website has been updated for the 2023 reporting year requirements and the IAEAP will be offering one-on-one training and assistance to businesses with less than 100 employees. Small businesses can request free training or assistance which allows them to meet one-on-one with an IAEAP specialist. Specialists will be able to answer any questions, review calculation, discuss the additional tools and resources available and provide guidance for data entry using the State and Local Emissions Inventory System (SLEIS). 

“Jennifer Wittenburg [IAEAP Program Manager] was incredible to work with. She helped a start-up small business without the budget to hire a consultant to successfully get needed documents together for complete compliance. Cannot thank her enough!” - 2023 Client

To request one-on-one training or assistance, please visit the MSEI website As a reminder, emissions inventories are due May 15, 2024 and as of January 1, 2023 all air emissions reporting is required to be submitted electronically through SLEIS. The only exception is for group 2 grain elevators, concrete batch batch plants, crushing plants and hot mix asphalt plants that use specialized forms or standardized online spreadsheets for emissions reporting. Forms and spreadsheets may continue to be used. 

In addition to one-on-one training, businesses can utilize the tutorials, emissions calculators and other resources the IAEAP has developed and shared Data collected in the MSEI is used by the DNR to track Iowa's progress towards meeting national air quality standards, perform regional and local air pollution dispersion modeling, develop control and maintenance strategies required by the Clean Air Act and identify emission levels and trends throughout the state.

Contact Molly Wells, Communications & Public Relations Manager at the University of Northern Iowa Iowa Waste Reduction Center, for more information at 319-273-5352 or


About Iowa Waste Reduction Center. The IWRC has been providing environmental services, including technical assistance and industry training, as well as research and development, for over 30 years. The IWRC is a part of the University of Northern Iowa's Business and Community Services which builds a better Iowa through hands‐on technical assistance for economic and business development, entrepreneurship, environmental improvement and enhanced sustainability. For more information, visit