| Jim Obradovich | Association of Regional Water Organizations | Supporting | GA89 |
| Robert Mulqueen | Association of Regional Water Organizations | Supporting | GA89 |
| Christopher Rants | Center for Rural Affairs | Supporting | GA89 |
| Cody Smith | Center for Rural Affairs | Supporting | GA89 |
| John Cacciatore | Center for Rural Affairs | Supporting | GA89 |
| Johnathan Hladik | Center for Rural Affairs | Supporting | GA89 |
| Jim Obradovich | Conservation Districts of Iowa | Supporting | GA89 |
| Robert Mulqueen | Conservation Districts of Iowa | Supporting | GA89 |
| Drew Kamp | Council Bluffs Chamber of Commerce | Undecided | GA89 |
| Nick Laning | Des Moines Water Works | Undecided | GA89 |
| Threase Harms | Des Moines Water Works | Undecided | GA89 |
| Josh Mandelbaum | Environmental Law and Policy Center | Undecided | GA89 |
| Steve Falck | Environmental Law and Policy Center | Undecided | GA89 |
| Andrea Woodard | Greater Des Moines Partnership | Undecided | GA89 |
| Brad Epperly | Greater Des Moines Partnership | Undecided | GA89 |
| Dustin Miller | Greater Des Moines Partnership | Undecided | GA89 |
| Alex Cutchey | Iowa Association of Municipal Utilities | Undecided | GA89 |
| Julie Smith | Iowa Association of Water Agencies | Supporting | GA89 |
| Kellie Paschke | Iowa Cattlemen's Association | Undecided | GA89 |
| Kelly Meyers | Iowa Cattlemen's Association | Undecided | GA89 |
| Logan Murray | Iowa Cattlemen's Association | Undecided | GA89 |
| Troy Skinner | Iowa Cattlemen's Association | Undecided | GA89 |
| Brad Epperly | Iowa Chamber Alliance | Undecided | GA89 |
| Dustin Miller | Iowa Chamber Alliance | Undecided | GA89 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Supporting | GA89 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Undecided | GA89 |
| Brian Carter | Iowa Conference of United Methodist Church | Supporting | GA89 |
| Gary Nims | Iowa Conference of United Methodist Church | Supporting | GA89 |
| Rita Carter | Iowa Conference of United Methodist Church | Supporting | GA89 |
| Roberta Paige | Iowa Conference of United Methodist Church | Supporting | GA89 |
| Colin Tadlock | Iowa Department of Agriculture & Land Stewardship | Undecided | GA89 |
| Doug Struyk | Iowa Drainage District Association | Supporting | GA89 |
| Jennifer Dorman | Iowa Drainage District Association | Supporting | GA89 |
| Jim Carney | Iowa Drainage District Association | Supporting | GA89 |
| John Torbert | Iowa Drainage District Association | Supporting | GA89 |
| Mona Bond | Iowa Drainage District Association | Supporting | GA89 |
| Angela Davis | Iowa Environmental Council | Undecided | GA89 |
| Hannah McDowell | Iowa Farmers Union | Supporting | GA89 |
| Hannah McDowell | Iowa Farmers Union | Undecided | GA89 |
| Nick Laning | Iowa Farmers Union | Supporting | GA89 |
| Nick Laning | Iowa Farmers Union | Undecided | GA89 |
| Threase Harms | Iowa Farmers Union | Supporting | GA89 |
| Threase Harms | Iowa Farmers Union | 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 |
| Tim Wagner | Izaak Walton League of America | Undecided | GA89 |
| Eric Goranson | Pheasants Forever, Inc. & Quail Forever | Undecided | GA89 |
| Doug Struyk | The Nature Conservancy | Supporting | GA89 |
| Jennifer Dorman | The Nature Conservancy | Supporting | GA89 |
| Jim Carney | The Nature Conservancy | Supporting | GA89 |
| John Norris | Union of Concerned Scientists | Undecided | GA89 |
| Brad Epperly | res | Undecided | GA89 |
| Dustin Miller | res | Undecided | GA89 |