| Cynthia Farmer | Center for Rural Affairs | Supporting | GA91 |
| Jacob Schrader | Central Iowa Water Works | Supporting | GA91 |
| Logan Murray | Central Iowa Water Works | Supporting | GA91 |
| Sydney Gangestad | Central Iowa Water Works | Supporting | GA91 |
| Jefferson Fink | Conservation Districts of Iowa | Supporting | GA91 |
| Jim Obradovich | Conservation Districts of Iowa | Supporting | GA91 |
| Catherine Pollard | Des Moines Water Works | Supporting | GA91 |
| Nick Laning | Des Moines Water Works | Supporting | GA91 |
| Threase Harms | Des Moines Water Works | Supporting | GA91 |
| Arthur Roche | Dubuque Area Land and Water Legacy | Supporting | GA91 |
| Josh Mandelbaum | Environmental Law and Policy Center | Supporting | GA91 |
| Matt Ohloff | Environmental Law and Policy Center | Supporting | GA91 |
| Amy Campbell | Iowa Association of County Conservation Boards | Supporting | GA91 |
| Craig Patterson | Iowa Association of County Conservation Boards | Supporting | GA91 |
| Kelsey Schott | Iowa Association of Water Agencies | Supporting | GA91 |
| Matt McKinney | Iowa Association of Water Agencies | Supporting | GA91 |
| RG Schwarm | Iowa Association of Water Agencies | Supporting | GA91 |
| Briana Kouma | Iowa Chapter of Sierra Club | Supporting | GA91 |
| Jessica Mazour | Iowa Chapter of Sierra Club | Supporting | GA91 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Supporting | GA91 |
| Ian Latham | Iowa Corn Growers Association | Undecided | GA91 |
| Jeff Smith | Iowa Corn Growers Association | Undecided | GA91 |
| Maggie Smith-Fitzgerald | Iowa Corn Growers Association | Undecided | GA91 |
| Matt Fitzgerald | Iowa Corn Growers Association | Undecided | GA91 |
| Nathan Hohnstein | Iowa Corn Growers Association | Undecided | GA91 |
| Haley Hook | Iowa Department of Agriculture & Land Stewardship | Undecided | GA91 |
| Todd Coffelt | Iowa Dept. of Natural Resources | Undecided | GA91 |
| Catherine Pollard | Iowa Environmental Council | Supporting | GA91 |
| Colleen Fowle | Iowa Environmental Council | Supporting | GA91 |
| Kerri Johannsen | Iowa Environmental Council | Supporting | GA91 |
| Michael Schmidt | Iowa Environmental Council | Supporting | GA91 |
| Threase Harms | Iowa Environmental Council | Supporting | GA91 |
| Catherine Pollard | Iowa Farmers Union | Supporting | GA91 |
| Threase Harms | Iowa Farmers Union | Supporting | GA91 |
| Amy Campbell | Iowa Natural Heritage Foundation | Supporting | GA91 |
| Anna Gray | Iowa Natural Heritage Foundation | Supporting | GA91 |
| Craig Patterson | Iowa Natural Heritage Foundation | Supporting | GA91 |
| Emily Piper | Iowa Rural Water Association | Supporting | GA91 |
| Logan Shine | Iowa Rural Water Association | Supporting | GA91 |
| Phil Jeneary | Iowa Sportsmans Club | Supporting | GA91 |
| Dane Schumann | Izaak Walton League - Iowa Division | Supporting | GA91 |
| Emily Piper | Rathbun Regional Water Association | Supporting | GA91 |
| Logan Shine | Rathbun Regional Water Association | Supporting | GA91 |
| Amber Markham | The Nature Conservancy | Supporting | GA91 |
| Doug Struyk | The Nature Conservancy | Supporting | GA91 |
| Emily Kavanagh | The Nature Conservancy | Supporting | GA91 |
| Jennifer Dorman | The Nature Conservancy | Supporting | GA91 |
| Jim Carney | The Nature Conservancy | Supporting | GA91 |
| Jake Ketzner | Urbandale Water Utility | Supporting | GA91 |
| Larry Blixt | Urbandale Water Utility | Supporting | GA91 |
| Nick Boeyink | Urbandale Water Utility | Supporting | GA91 |
| Clair Lewis | West Des Moines Water Works | Supporting | GA91 |
| Kate Walton | West Des Moines Water Works | Supporting | GA91 |
| Matt Eide | West Des Moines Water Works | Supporting | GA91 |