| Colin Tadlock | Iowa Department of Agriculture & Land Stewardship | Undecided | GA89 |
| Doug Struyk | Iowa Drainage District Association | Undecided | GA89 |
| Jennifer Dorman | Iowa Drainage District Association | Undecided | GA89 |
| Jim Carney | Iowa Drainage District Association | Undecided | GA89 |
| John Torbert | Iowa Drainage District Association | Undecided | GA89 |
| Mona Bond | Iowa Drainage District Association | Undecided | GA89 |
| Nick Laning | Iowa Emergency Management Association | Undecided | GA89 |
| Threase Harms | Iowa Emergency Management Association | Undecided | GA89 |
| Angela Davis | Iowa Environmental Council | Undecided | GA89 |
| Blake DeRouchey | Iowa Homeland Security & Emergency Management Div. | Undecided | GA89 |
| Jamie Cashman | Iowa State Association of Counties | Undecided | GA89 |
| Kristi Harshbarger | Iowa State Association of Counties | Undecided | GA89 |
| Lucas Beenken | Iowa State Association of Counties | Undecided | GA89 |
| William Peterson | Iowa State Association of Counties | Undecided | GA89 |
| Jamie Cashman | Iowa State Association of County Supervisors | Undecided | GA89 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Undecided | GA89 |
| Lucas Beenken | Iowa State Association of County Supervisors | Undecided | GA89 |
| William Peterson | Iowa State Association of County Supervisors | Undecided | GA89 |
| Doug Struyk | The Nature Conservancy | Undecided | GA89 |
| Jennifer Dorman | The Nature Conservancy | Undecided | GA89 |
| Jim Carney | The Nature Conservancy | Undecided | GA89 |
| Sydney Gangestad | Two Rivers Levee & Drainage District | Supporting | GA89 |
| Tim Coonan | Two Rivers Levee & Drainage District | Supporting | GA89 |