| 2015 | 1999 | 1979 |
| C. Bryan Trussell | Kris Brooks | Ole Thompson |
| Trussell Technologies | Marcab Co. | LACSD |
| 2014 | 1998 | 1978 |
| Miluska Propersi | Kris Flaig | Jim Colbaugh |
| RMC Water and Environment | City of Los Angeles | Las Virgenes MWD |
| 2013 | 1997 | 1977 |
| Ian MacKenzie | Stacey Stillwell | Dave Ringel |
| Hazen and Sawyer | Black & Veatch | City of Los Angeles DWP |
| 2012 | 1996 | 1976 |
| Alec Mackie | Mark Starr | Rich Wunderlich |
| JWC Environmental | City of Los Angeles | LACSD |
| 2011 | 1995 | 1975 |
| Wendy Wert | Michael Creel | Jack Jacobs |
| LACSD | LACSD | City of Los Angeles DWP |
| 2010 | 1994 | 1974 |
| Pat McDaniel | Henry Dove | George Ohara |
| Biocope | City of West Covina | City of Los Angeles |
| 2009 | 1993 | 1973 |
| Hala Titus | Harendra Mehta | Hy Katz |
| Black & Veatch | LACSD | California Dept. Health |
| 2008 | 1992 | 1972 |
| Patrick Griffith | Lou Giordano | Richard Kuhns |
| LACSD | Pacific Process | Los Angeles Co. Engineer |
| 2007 | 1991 | 1971 |
| Pei-Chin Low | James Clark | Lloyd Hedenland |
| MWH | Black & Veatch | Las Virgenes MWD |
| 2006 | 1990 | 1970 |
| John Mays | Robert Peak | Lawrence Russel |
| City of Los Angeles | Brown & Caldwell | City of Los Angeles DWP |
| 2005 | 1989 | 1969 |
| Debra Bogdanoff | William Ruff | Ray Jellison |
| LACSD | Las Virgenes MWD | City of Los Angeles |
| 2004 | 1988 | 1968 |
| Connie Leonard | David Greenwood | George Callahan |
| CDM | LACSD | City of Los Angeles |
| 2003 | 1985 | 1967 |
| Jon Ganz | Ken Ludwig | Charles Carry |
| LACSD | City of Los Angeles | LACSD |
| 2002 | 1984 | 1966 |
| Kosta Kaporis | Frances Janssen | Robert King |
| City of Los Angeles | LACSD | City of Vernon |
| 2001 | 1983 | 1965 |
| Gino Rapagna | David Olsen | Herb Johnson |
| HDR | J.M. Montgomery | City of Los Angeles |
| 2000 | 1982 | 1964 |
| Mark Pettit | Dave A. Badgley | Robert Longacre |
| LACSD | Cues Inc. | City of Alhambra |
| 1981 | 1963 | |
| Howard Rigdon | Charles Imel | |
| Consultant | City of Los Angeles | |
| 1980 | 1962 | |
| Ron Young | John Murphy | |
| Irvine Ranch MWD | City of Los Angeles |
