Below is a current list of registrants.
| Full Name | Company |
|---|---|
| Richard Ommert | City of Aurora - Public Works |
| Chris Olson | Wright Water Engineers |
| Laurel Olsen-Horen | City of Boulder |
| Jordan Ollanik | Advanced Drainage Systems |
| Deb Ohlinger | Olsson |
| Swirvine Nyirenda | City of Aurora |
| Mark Nyhoff | Muller Engineering Company |
| Ken Nyhoff | City of Lakewood |
| Jason Nyberg | Quantum Spatial |
| Jessica Nolle | RESPEC |
| Jeni Nicovich | City of Durango |
| Jon Nelson | SEMSWA |
| Caleb Nelson | Calibre Engineering |
| Jerry Naranjo | Naranjo Civil Constructors, Inc. |
| William Murphy | Bowman Construction Supply |
| Lilly Murphy | Calibre Engineering |
| Brian Murphy | Otak, Inc. |
| Kevin Muller | City of Boulder |
| Jacob Moyer | City of Westminster |
| Rick Moser | RESPEC |
| Caroline Morrison | Austin Civil Group, Inc. |
| David Morrisey | City & County of Denver Public Works |
| Josh Morin | City of Greenwood Village |
| Suzanne Moore | City of Greenwood Village |
| Amanullah Mommandi | Colorado DOT |
| Geoff Mok | Contech Engineered Solutions LLC |
| Dan Mogen | City of Fort Collins |
| Douglas Mize | Souder Miller & Associates |
| Bridget Mitchell | Pinyon Environmental, Inc. |
| Brennan Middleton | HDR |
| Jaclyn Michaelsen | ICON Engineering, Inc. |
| Randy Mettlen | City of Brush! |
| Jason Messamer | Colorado Springs Utilities |
| Saman Mehdi | WSP |
| Patrick McNeirney | HDR |
| Nicholas McMurtrey | Murraysmith |
| Richard McLaughlin | Merrick & Company |
| Aaron McKelvey | La Plata County |
| JP McFarren | Muller Engineering Company |
| Chris McFarland | HR Green, Inc. |
| James McEwen | Adler Tank Rentals |
| Heather McDaniel | Souder Miller & Associates |
| Brian McCormick | Colorado Springs Utilities |
| Jake Maybach | RS&H |
| Dale Mathison | Ayres Associates |
| Maggie Mathis | Dewberry |
| Michelle Martin | Anderson Consulting Engineers, Inc. |
| Leylin Marroquin | AECOM |
| Brenden Marron | City & County of Denver Public Works |
| Angelica Makuch | HDR |