| Angela Caulk | International Association of Plumbing & Mechanical Officials (IAPMO) | Supporting | GA90 |
| Logan Murray | International Association of Plumbing & Mechanical Officials (IAPMO) | Supporting | GA90 |
| Noah Tabor | International Association of Plumbing & Mechanical Officials (IAPMO) | Supporting | GA90 |
| Jefferson Fink | Iowa Association of Building Officials | Undecided | GA90 |
| Jim Obradovich | Iowa Association of Building Officials | Undecided | GA90 |
| Maddie Wilcox | Iowa Department of Health and Human Services | Undecided | GA90 |
| Peter Hird | Iowa Federation of Labor, AFL-CIO | Supporting | GA90 |
| Dylan Gramlich | Laborers International Union of North America | Undecided | GA90 |
| Gary Grant | Linn County Board of Supervisors | Undecided | GA90 |
| Larry Murphy | Linn County Board of Supervisors | Undecided | GA90 |
| Christopher Rants | Mechanical Contractors Association of Iowa (MCAI) | Supporting | GA90 |
| Justin Hupfer | Mechanical Contractors Association of Iowa (MCAI) | Supporting | GA90 |
| John Cacciatore | Plumbers and Steam Fitters Local 33 | Supporting | GA90 |
| Eric Goranson | Plumbing Heating & Cooling Contractors of IA | Supporting | GA90 |
| David Adelman | Sheet Metal Contractors of Iowa | Undecided | GA90 |
| Frank Chiodo | Sheet Metal Contractors of Iowa | Undecided | GA90 |
| Lillie Brady | Sheet Metal Contractors of Iowa | Undecided | GA90 |
| Matt Hinch | Sheet Metal Contractors of Iowa | Undecided | GA90 |
| Sara Allen | Sheet Metal Contractors of Iowa | Undecided | GA90 |
| Gary Grant | Urban County Coalition | Undecided | GA90 |
| Larry Murphy | Urban County Coalition | Undecided | GA90 |