| 2019 |
Abigail Gomez |
City of Fontana |
| 2018 |
Jennifer Peet |
City of Modesto |
| 2017 |
Jonathon Powell |
Orange County Sanitation District |
| 2016 |
Stephen Sealy |
Los Angeles County Sanitation Districts |
| 2014 |
Meg Herston |
Fairfield-Suisun Sewer |
| 2013 |
Kay Allen |
City of Simi Valley |
| 2012 |
Allen Grayson |
Lawrence Livermore National Laboratory |
| 2011 |
Peter Fong |
South Bayside System Authority |
| 2010 |
Michael Simpson |
City of Los Angeles |
| 2009 |
Joseph Petchunk |
City of Santa Monica |
| 2008 |
Norman Domingo |
South Bayside System Authroity |
| 2007 |
Paul Schmidtbauer |
South Orange County Wastewater Authority |
| 2006 |
Gary Welling |
City of Santa Monica |
| 2005 |
Deon Carrico |
Orange County Sanitation District |
| 2004 |
Gayle Tupper |
East Bay MUD |