Public Comment Form

Commenting open: April 17, 2025 12:00AM CT - May 19, 2025 11:59PM CT.

CHS Mankato - Air Permit

We invite you to comment on the draft air quality permit for CHS Mankato.


CHS produces soybean oil and soybean co-products at its oilseed processing plant in Mankato. The facility produces air emissions from the mills and extractors used to process soybeans.


The draft air permit reissues the facility’s operating permit and authorizes the replacement of an existing boiler with a new boiler and the addition of four new non-emergency engines. The draft air permit limits emissions from the combustion of natural gas and requires monitoring and testing.


An air quality operating permit is required for certain existing facilities or the construction of new facilities that have the potential to emit a significant level of any regulated pollutant. The permit includes all requirements for operation and procedures, applicable rules, emission standards, monitoring, recordkeeping, and reporting. If additional conditions change and modifications are necessary, the MPCA may review and amend the permit.



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Thank you for providing feedback on this project. We value your comments and will use them to assess this project further.


In your comments, please state your interest in the permit application or the draft permit; the explicit actions you wish the MPCA to take, including specific references to the section of the draft permit you believe should be changed; and the reasons supporting your position, stated with sufficient specificity as to allow the MPCA to investigate the merits of the position.


If you want to submit a letter, you can upload the letter on this website or submit it via US Mail to the following address:


Minnesota Pollution Control Agency
c/o Kara Leadbetter
520 Lafayette Road
Saint Paul, MN 55155

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