Iowa DNR Air Quality Permit Reviews and Public Comment Period
Summary
The Iowa DNR is reviewing draft air quality permits for five facilities, including Title V Operating Permits and construction permits. The public is encouraged to submit written comments before the respective deadlines in April 2026.
What changed
The Iowa Department of Natural Resources (DNR) Air Quality Bureau has published draft air quality permits for review, including Title V Operating Permits for Northern Natural Gas Company and Natural Gas Pipeline Co. of America, and construction permits for Shell Rock Soy Processing. These reviews are part of a five-year federal requirement for Title V permits and a pre-construction review for new or modified sources of air pollution. The DNR is seeking public input on these draft permits.
Regulated entities and the public have until April 11, 2026, to submit written comments on the Title V permits and until April 12, 2026, for the construction permit for Shell Rock Soy Processing. Comments should be submitted in writing to the assigned permit writer. The DNR will consider these comments before finalizing the permits. Failure to submit comments by the deadline may limit future participation in administrative or judicial review.
What to do next
- Review draft Title V Operating Permits for Northern Natural Gas Company and Natural Gas Pipeline Co. of America.
- Review draft construction permits for Shell Rock Soy Processing.
- Submit written comments to the assigned permit writer by the specified deadlines (April 11 or April 12, 2026).
Source document (simplified)
Air quality permits for review, published 03/12/2026
Thursday, March 12, 2026
DES MOINES – The DNR Air Quality Bureau has the following draft permits up for review. The permits help protect Iowans’ health and the air where we live. DNR’s permitting staff review the applications to ensure facilities comply with state and federal air quality standards. The public has the right and is encouraged to comment on draft permits. DNR considers public comments before finalizing the permits. Submit comments in writing to the assigned permit writer before 4:30 p.m. on the last day of the comment period.
Title V Operating Permits
Title V Operating permits are reviewed and re-issued every five years. Facilities with a Title V permit have the potential to emit large amounts of air pollutants compared to other facilities. The five-year reviews are a federal requirement and ensure adequate monitoring is included in the permit. The DNR plans to issue Title V Operating Permits for the following facilities. Find permit details at www.iowadnr.gov/titlev-draft or through the Iowa EASY Air Public Inquiry Portal and then click on the Public Notice tab.
Boone County
Northern Natural Gas Company - Ogden located at 608 210th Street, Ogden
The application was submitted to operate their existing Natural Gas Transmission facility. The public comment period ends April 11.
Louisa County
Natural Gas Pipeline Co. of America/Station 199 located at Us Hwy 61 & County Road G34, Letts, IA.
The application was submitted to operate their existing Natural Gas Transmission facility. The public comment period ends April 11.
Construction Permits
DNR engineers review and issue construction permits to facilities before they build new or modify existing sources of air pollution. The public may review the following air quality construction permits available online at https://idnraqrr.iowadnr.gov/ConPermitSearch or through the EASY Air Public Inquiry Portal and then click the Public Notice tab.
Butler County
Shell Rock Soy Processing, 30340 220th St., Shell Rock.Project No. 25-355, Modification of existing PSD permits by correcting emission units and stack characteristics, increasing hull products, and revising BACT standards. The public comment period ends April 12.
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