Public Comment Form

Commenting open: March 19, 2025 06:00AM CT - April 18, 2025 11:59PM CT.

Northern Natural Gas (Carlton) - Air Permit

We invite you to comment on the draft air quality permit for Northern Natural Gas's Carlton facility.


Northern Natural Gas operates a compressor station in Carlton that makes use of two natural gas-fired reciprocating engines and one natural gas-fired auxiliary electrical generator to pressurize natural gas to move it through a pipeline.


The draft permit reissues the facility’s air quality permit and does not authorize any construction or new emissions. The draft permit limits nitrogen oxides emissions and requires testing, monitoring, and recordkeeping, which are carried over from the existing permit.


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 Joy Wiecks
520 Lafayette Road
Saint Paul, MN 55155

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