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  SMALL (1-25 Employees) MEDIUM (26-75 Employees) LARGE (76 or More)
2019 City of Palm Springs WWTP Central Marin Sanitation Agency  

CDMSmith, USMC Southern Region Tertiary Treatment Plant

Fairfield-Suisun Sewer District

2017 Ironhouse Sanitary District South Orange County Wastewater Authority Encina Wastewater Authority
2016 Carmel Area Wastewater District Central Marin Sanitation Agency Central Contra Costa Sanitary District
2015 City of Los Angeles, Department of Public Works, Glendale Wastewater Reclamation Plant Encina Wastewater Authorityt Orange County Sanitation District
2014 Veolia-Arvin, Arvin Wastewater Treatment Plant Oro Loma Sanitary District Orange County Sanitation District
2013 City of Burlingame, Burlingame Wastewater Treatment Facility Delta Diablo Sanitation District Orange County Sanitation District
2012 San Elijo Joint Powers Authority Encina Wastewater Authority  
2011 Burlingame Wastewater Treatment Plant (Veolia Water) Fairfield-Suisun Sewer District Central Contra Costa Sanitary District
2010 Stantec/City of Lincoln Wastewater Treatment and Reclamation Facility Vallejo Sanitation & Flood Control District Union Sanitary District
2009 San Elijo Water Reclamation Facility Delta Diablo Sanitation District County Sanitation Districts of Los Angeles
2008 City of Rialto City of Sunnyvale Water Pollution Control Facility Fresno/Clovis Wastewater Reclamation Facility
2007 Burlingame Wastewater Treatment Facility / Veolia Water North America Oro Loma Sanitary District  
2006 Eco: LOGIC Engineering/City of Lincoln Wastewater TRF Palo Alto Regional Water Quality Control Plant Fresno-Clovis Regional WWRF
2005 Burlingame Wastewater Treatment Plant Central Marin Sanitation Agency Monterey Regional Water Pollution Control Agency
2004 Veolia Water NAOS, Atwater WW Treatment Plant City of Palo Alto WQCP East Bay MUD
2003 Burlingame Wastewater Treatment Plant City of Vacaville, Easterly Wastewater Treatment Plant Sacramento Regional Wastewater Treatment Plant
2002 Big Bear Area RWA South Tahoe Public Utility Dist  
2001 City of Burlingame Wastewater Treatment Facility Encina Wastewater Authority  
2000 Fallbrook WTP    
1999 Fallbrook WTP South Tahoe Public Utility Dist. LACSD
1998 U.S. Filter EOS-Petaluma Vallejo S&FCD Irvine Ranch WD
1997 Goleta Sanitary District Oro Loma Sanitary District Palo Alto RWQCP
1996 EOS Petaluma West County WWTP Sacramento RCSD
  <10 MGD >10 MGD Local Section
1995 Goleta Sanitary District Vallejo S&FCD Sierra Section
1994 Central Marin SA Central Contra Costa SD Sierra Section
  <20 MGD >20 MGD Local Section
1993 Selma-Kingsburg-Fowler CSD City Palo Alto RWQCP San Francisco Bay Section
1992 Horton WWTP Central Marin SA Santa Clara Valley Section
1991 Oro Loma SD Dublin San Ramon Svcs Dist Santa Clara Valley Section
1990   Palo Alto Regional  
1989 City of Sunnyvale WPCP City of Stockton