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