| 2019 |
Central Contra Costa Sanitary District |
The Central San Pipe Protectors |
| 2018 |
One Water LA |
|
| 2017 |
Ventura Water |
Ventura Water and MERITO Foundation Education Outreach Partnership |
| 2016 |
Wastewater Treatment Agencies of Marin County |
Wastewater Treatment Agencies of Marin County Public Education Program |
| 2015 |
N/A |
N/A |
| 2014 |
Wastewater Treatment Agencies of Marin County |
Wastewater Treatment Agencies of Marin County Public Education Program |
| 2013 |
City of Los Angeles |
|
| 2012 |
Wastewater Treatment Agencies of Marin County |
Wastewater Treatment Agencies of Marin County Public Education Program |
| 2011 |
Coachella Valley Water District |
|
| 2010 |
City of Los Angeles |
|
| 2009 |
Wastewater Treatment Agencies of Marin County |
Wastewater Treatment Agencies of Marin County Public Education and Outreach |
| 2008 |
City of Los Angeles Bureau of Sanitation |
Kids in Action: Students Tackle Stormwater Pollution |
| 2007 |
Sanitation Districts of Los Angeles County |
The Clearwater Program Public Outreach |
| 2006 |
Monterey Regional WPCA |
Changing Wastewater into Safe Water - the Adventures of Wally the Water Drop |
| 2005 |
Victor Valley Wastewater Reclamation Authority |
Subregional Reclamation Facilities - School Education Outreach |
| 2004 |
County Sanitation District of Los Angeles County |
Residential Chloride Source Reduction Project |
| 2003 |
County Sanitation District 1 of Sacramento RCSD |
FOG Source Control Public Education Program |
| 2002 |
County Sanitation District 1 of Sacramento |
2002 Rate Increase Outreach Campaign |
| 2001 |
City of Palo Alto Regional Water Quality Control Plant, Central Contra Costa Sanitary District and South Bayside System Authority |
Sewer Science Wastewater Lab |
| 2000 |
West Basin Municipal Water District & Central Basin Municipal Water District |
Planet Protector Water Explorations |
| 1999 |
Central Contra Costa Sanitary District |
Our Water, Our World Pesticide Reduction Program |