| 4Walls International | National City |
| Agua Hedionda Lagoon Foundation | Carlsbad |
| Anza-Borrego Desert Natural History Association | Anza Borrego |
| Anza-Borrego Foundation & Institute | Anza Borrego |
| Back Country Land Trust | Countywide |
| Bataquitos Lagoon Foundation | Carlsbad |
| Boy Scouts of America - San Diego/Imperial | Countywide |
| Buena Vista Audubon | Oceanside |
| Buena Vista Lagoon Foundation | Carlsbad |
| Casa Familiar | San Ysidro |
| Circulate San Diego | Countywide |
| Citizens Coordinate for Century 3 | San Diego |
| Cleveland National Forest Foundation | Countywide |
| Earth Discovery Institute | Countywide |
| Endangered Habitats Conservancy | Countywide |
| Environmental Health Coalition | National City |
| Escondido Creek Conservancy | Escondido |
| Escondido Education COMPACT | Escondido |
| Friends of Balboa Park | San Diego |
| Friends of Blue Sky | Poway |
| Friends of Daley Ranch | Escondido |
| Friends of Famosa Slough | San Diego |
| Friends of Los Penasquitos Canyon Preserve | Escondido |
| Friends of Palomar Mountain State Park | Palomar |
| Friends of Rose Canyon | San Diego |
| Friends of Ruffin Canyon | Mission Valley |
| Friends of Wilderness Gardens Preserve | Escondido |
| Girl Scouts San Diego | Countywide |
| I Love a Clean San Diego | San Diego |
| Indigenous Regeneration | San Pasqual Reservation |
| International Rescue Committee in San Diego | Countywide |
| Laguna Mountain Volunteer Association | Descanso |
| Lakeside River Park Conservancy | Lakeside |
| Living Coast Discovery Center | Chula Vista |
| Logan Heights CDC | Logan Heights |
| Los Penasquitos Canyon Preserve | San Diego |
| Ocean Connections | National City |
| Ocean Discovery Institute | San Diego |
| Ocean Discovery Institute | San Diego |
| Otay Valley Regional Park | Otay |
| Outdoor Outreach | Countywide |
| Palomar Audubon | Escondido |
| Preserve Calavera | San Diego |
| Ramona Trails Association | Ramona |
| San Diego Audubon Society | Countywide |
| San Diego Botanical Gardens | Encinitas |
| San Diego Canyonlands | Countywide |
| San Diego Children & Nature Collaborative (SDCaN) | Countywide |
| San Diego County Parks Society | Countywide |
| San Diego Habitats Conservancy | La Mesa |
| San Diego Hiking Club | Countywide |
| San Diego Natural History Museum | Countywide |
| San Diego Natural History Museum Canyoneers | Countywide |
| San Diego River Park Foundation | Mission Valley |
| San Diego Tracking Team | Countywide |
| San Diego Zoo Global | Countywide |
| San Dieguito River Park | Del Mar area |
| San Dieguito River Park Foundation | Del Mar area |
| San Dieguito River Valley Conservancy | Del Mar area |
| San Dieguito River Valley Conservancy | San Dieguito River Valley |
| San Elijo Lagoon Conservancy | Encinitas |
| Sierra Club San Diego | Countywide |
| Social Advocates for Youth (SAY San Diego) | Countywide |
| Southwest Wetlands Interpretive Association (SWIA) | Imperial Beach |
| Surfrider | Countywide |
| Tijuana River National Estuarine Research Reserve | Imperial Beach |
| Torrey Pines State Reserve/Association | Torrey Pines |
| Tree San Diego | Countywide |
| Urban Corps of San Diego County | Countywide |
| Volcan Mountain Preserve Foundation | Julian |
| Water Conservation Garden at Cuyamaca College | El Cajon |
| Wildcoast (Costasalvaje) | Imperial Beach |
| Wilderness4All | Countywide |
| YMCA of San Diego County | Countywide |
