Accepting comments from April 01, 2026, through May 01, 2026.
The Idaho Department of Environmental Quality (DEQ) seeks comment on a draft permit to construct revision for J.R. Simplot Company’s Don Siding Plant.
J.R. Simplot Company’s Don Siding Plant manufactures integrated phosphate fertilizer and other commercial products northwest of Pocatello, Idaho. The company is applying to revise its permit to construct to incorporate a new annual fluoride emission limit for all reclaim cooling tower (RCT) cells in the plant. The Don Plant has five cells split between two RCTs. The permit provides a particulate matter, PM10, and fluoride emission limit for each cell on an hourly and annual basis.
DEQ has determined that construction and operation according to the proposed permit will not cause or significantly contribute to a violation of any ambient air quality standard and will not injure or unreasonably affect human or animal life or vegetation. DEQ has reviewed the application and completed an analysis of the information submitted by the applicant to incorporate revised reclaim cooling tower fluoride emission limits per amended Consent Order for E-2012.0022. Based on this analysis, DEQ proposes to issue the permit to construct to J.R. Simplot Company’s Don Siding Plant.
The draft permit materials are available for public review at DEQ’s State Office (1410 N. Hilton St.) and below in related documents. Written comments on the draft permit and supporting materials will be accepted through May 01, 2026, at 5 p.m. MT. Submit comments using the form below or via mail or email to:
Dianne Hobbs
1410 N. Hilton St.
Boise, ID 83706
dianne.hobbs@deq.idaho.gov
For technical assistance on questions concerning this project or the permitting process, contact Nachammai Vairavan at (208) 373-0502 or nachammai.vairavan@deq.idaho.gov.
Related Documents
Permit Materials
Accessibility Services: The Idaho Department of Environmental Quality will provide reasonable language access services and/or disability services for documents at no charge. To request an accommodation under Title VI of the Civil Rights Act of 1964 or Americans with Disabilities Act, contact DEQ’s nondiscrimination coordinator at (208) 373-0271 or accessibility@deq.idaho.gov. Para obtener información en español, visite https://www.deq.idaho.gov/about-us/accessibility/.
Official Government Website
DEQ seeks comment on draft permit to construct revision for J.R. Simplot Company
Accepting comments from April 01, 2026, through May 01, 2026.
The Idaho Department of Environmental Quality (DEQ) seeks comment on a draft permit to construct revision for J.R. Simplot Company’s Don Siding Plant.
J.R. Simplot Company’s Don Siding Plant manufactures integrated phosphate fertilizer and other commercial products northwest of Pocatello, Idaho. The company is applying to revise its permit to construct to incorporate a new annual fluoride emission limit for all reclaim cooling tower (RCT) cells in the plant. The Don Plant has five cells split between two RCTs. The permit provides a particulate matter, PM10, and fluoride emission limit for each cell on an hourly and annual basis.
DEQ has determined that construction and operation according to the proposed permit will not cause or significantly contribute to a violation of any ambient air quality standard and will not injure or unreasonably affect human or animal life or vegetation. DEQ has reviewed the application and completed an analysis of the information submitted by the applicant to incorporate revised reclaim cooling tower fluoride emission limits per amended Consent Order for E-2012.0022. Based on this analysis, DEQ proposes to issue the permit to construct to J.R. Simplot Company’s Don Siding Plant.
The draft permit materials are available for public review at DEQ’s State Office (1410 N. Hilton St.) and below in related documents. Written comments on the draft permit and supporting materials will be accepted through May 01, 2026, at 5 p.m. MT. Submit comments using the form below or via mail or email to:
Dianne Hobbs
1410 N. Hilton St.
Boise, ID 83706
dianne.hobbs@deq.idaho.gov
For technical assistance on questions concerning this project or the permitting process, contact Nachammai Vairavan at (208) 373-0502 or nachammai.vairavan@deq.idaho.gov.
Related Documents
Permit Materials
Accessibility Services: The Idaho Department of Environmental Quality will provide reasonable language access services and/or disability services for documents at no charge. To request an accommodation under Title VI of the Civil Rights Act of 1964 or Americans with Disabilities Act, contact DEQ’s nondiscrimination coordinator at (208) 373-0271 or accessibility@deq.idaho.gov. Para obtener información en español, visite https://www.deq.idaho.gov/about-us/accessibility/.
Public Comment Form