| Oct. 1992-Feb. 2000 |
Charles Carry
Los Angeles County Sanitation Districts |
| Feb. 2000 – June 2003 |
Kamil Azoury
Goleta Sanitary District |
| July 2003 – June 2005 |
John Pastore
Lee Lake Water District |
| July 2005 – Oct. 2005 |
Blake Anderson
Orange County Sanitation District |
| Oct. 2005 – Dec. 2006 |
James F. Stahl
Los Angeles County Sanitation Districts |
| Jan. 2007 – June 2010 |
Richard Atwater
Inland Empire Utilities Agency |
| July 2010 – June 2013 |
Enrique Zaldivar
City of Los Angeles |
| July 2013 - June 2015 |
Bob Ghirelli
Orange County Sanitation District |
| July 2015 - June 2017 |
Grace Robinson Hyde
Los Angeles County Sanitation Districts |
| July 2017 - June 2019 |
Peter Vroom
City of San Diego |
| July 2019 - June 2021 |
Craig Murray
Carpinteria Sanitary District |