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

MSEI header

IWRC and UNI Logos

CEDAR FALLS, Iowa - All portable plants as well as businesses classified by the Iowa Department of Natural Resources (DNR) as minor sources in counties throughout the central portion of the state may be required to submit the Minor Source Emissions Inventory (MSEI) by May 15, 2023. Counties in Central Iowa include: Appanoose, Boone, Butler, Cerro Gordo, Clarke, Dallas, Decatur, Floyd, Franklin, Grundy, Hamilton, Hancock, Hardin, Humboldt, Jasper, Kossuth, Lucas, Madison, Mahaska, Marion, Marshall, Mitchell, Monroe, Polk, Poweshiek, Story, Tama, Warren, Wayne, Webster, Winnebago, Worth and Wright. 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 2022 reporting year requirements and the IAEAP will be offering one-on-one training 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] provided outstanding assistance as well as explained the process. We are a small company of 13 employees and don’t possess the technical expertise that many other larger companies possess. We would recommend Jennifer to anyone needing assistance.” - 2022 Client

To request one-on-one training or assistance, please visit the MSEI website at As a reminder emissions inventories are due May 15, 2023 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 at 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