| Jacob Schrader | Central Iowa Water Works | Undecided | GA91 |
| Logan Murray | Central Iowa Water Works | Undecided | GA91 |
| Sydney Gangestad | Central Iowa Water Works | Undecided | GA91 |
| Taylor Sklenar | Climate Land Leaders | Opposing | GA91 |
| Jefferson Fink | Conservation Districts of Iowa | Undecided | GA91 |
| Jim Obradovich | Conservation Districts of Iowa | Undecided | GA91 |
| Catherine Pollard | Des Moines Water Works | Opposing | GA91 |
| Nick Laning | Des Moines Water Works | Opposing | GA91 |
| Threase Harms | Des Moines Water Works | Opposing | GA91 |
| Arthur Roche | Dubuque Area Land and Water Legacy | Opposing | GA91 |
| Josh Mandelbaum | Environmental Law and Policy Center | Opposing | GA91 |
| Matt Ohloff | Environmental Law and Policy Center | Opposing | GA91 |
| Jeanie Smith | Episcopal Diocese of Iowa | Opposing | GA91 |
| Jeanie Smith | Episcopal Diocese of Iowa | Supporting | GA91 |
| Paul Gennett | Episcopal Diocese of Iowa | Opposing | GA91 |
| Paul Gennett | Episcopal Diocese of Iowa | Supporting | GA91 |
| Wendy Abrahamson | Episcopal Diocese of Iowa | Opposing | GA91 |
| Wendy Abrahamson | Episcopal Diocese of Iowa | Withdrawn | GA91 |
| Wendy Abrahamson | Episcopal Diocese of Iowa | Supporting | GA91 |
| Jennifer Breon | Food & Water Watch | Opposing | GA91 |
| Briana Kouma | Iowa Chapter of Sierra Club | Opposing | GA91 |
| Jessica Mazour | Iowa Chapter of Sierra Club | Opposing | GA91 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Opposing | GA91 |
| Amy Campbell | Iowa Chapter of the National Association of Pediatric Nurse Practitioners | Opposing | GA91 |
| Craig Patterson | Iowa Chapter of the National Association of Pediatric Nurse Practitioners | Opposing | GA91 |
| Seth Brown | Iowa Chapter-American Academy of Pediatrics | Opposing | GA91 |
| Matthew Covington | Iowa Citizens for Community Improvement Action Fund | Opposing | GA91 |
| Todd Coffelt | Iowa Dept. of Natural Resources | Undecided | GA91 |
| Catherine Pollard | Iowa Environmental Council | Opposing | GA91 |
| Cody Smith | Iowa Environmental Council | Opposing | GA91 |
| Colleen Fowle | Iowa Environmental Council | Opposing | GA91 |
| Jordan Oster | Iowa Environmental Council | Opposing | GA91 |
| Kerri Johannsen | Iowa Environmental Council | Opposing | GA91 |
| Michael Schmidt | Iowa Environmental Council | Opposing | GA91 |
| Sarah Green | Iowa Environmental Council | Opposing | GA91 |
| Threase Harms | Iowa Environmental Council | Opposing | GA91 |
| Jefferson Fink | Iowa Environmental Health Association | Undecided | GA91 |
| Jim Obradovich | Iowa Environmental Health Association | Undecided | GA91 |
| Teresa Bomhoff | Iowa Integrated Health Planning and Advisory Council | Opposing | GA91 |
| Amy Campbell | Iowa Nurses Association | Opposing | GA91 |
| Craig Patterson | Iowa Nurses Association | Opposing | GA91 |
| Emily Piper | Iowa Rural Water Association | Undecided | GA91 |
| Logan Shine | Iowa Rural Water Association | Undecided | GA91 |
| Doug Struyk | Iowa State Bar Association | Undecided | GA91 |
| Jennifer Dorman | Iowa State Bar Association | Undecided | GA91 |
| Jim Carney | Iowa State Bar Association | Undecided | GA91 |
| Dane Schumann | Izaak Walton League - Iowa Division | Opposing | GA91 |
| Amy Campbell | League of Women Voters of Iowa | Opposing | GA91 |
| Craig Patterson | League of Women Voters of Iowa | Opposing | GA91 |
| Doug Struyk | The Nature Conservancy | Opposing | GA91 |
| Emily Kavanagh | The Nature Conservancy | Opposing | GA91 |
| Jennifer Dorman | The Nature Conservancy | Opposing | GA91 |
| Jim Carney | The Nature Conservancy | Opposing | GA91 |