| University of Iowa Main Power Plant | 22-413 | 04/22/2023 | Prevention of Significance Deterioration (PSD) |
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| John Deere Waterloo Works - Drive Train Operations | 22-402 | 03/25/2023 | Prevention of Significance Deterioration (PSD) |
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| Grain Processing Corporation | 22-246 | 03/06/2023 | State Implementation Plan (SIP) |
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| Pella West Substation | 23-003 | 04/08/2023 | Prevention of Significance Deterioration (PSD) |
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| Iowa Fertilizer Company | 22-012 | 04/08/2023 | Prevention of Significance Deterioration (PSD) |