Iowa Code § 455B.179
Upon a satisfactory showing by any person to the director that public disclosure of any record, report, permit, permit application, or other document or information or part thereof would divulge methods or processes entitled to protection as a trade secret, any such record, report, permit, permit application, or other document or part thereof other than effluent data and analytical results of monitoring of public water supply systems, shall be accorded confidential treatment. Notwithstanding the provisions of chapter 22, a person in connection with duties or employment by the department shall not make public any information accorded confidential status; however, any such record or other information accorded confidential status may be disclosed or transmitted to other officers, employees, or authorized representatives of this state or the United States concerned with carrying out this part 1 of subchapter III; chapter 459, subchapter III; or chapter 459A; or when relevant in any proceeding under this part 1 of subchapter III; chapter 459, subchapter III; or chapter 459A.
Iowa Code § 455B.179