Environment nonprofits in California
Environment nonprofits in California. Browse 4,392 public nonprofit profiles. Review organization identities, available filing years, and their complete CharitySense profiles.
Location refers to headquarters recorded in public sources, not an organization’s service area. Classification describes its reported category and does not assess its effectiveness.
Nonprofit profiles
- Oceans Unmanned Inc
EIN 812755786 · Headquarters: SANTA BARBARA, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990
- Oceans4all
EIN 464080392 · Headquarters: Santa Ynez, CA, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Oceanside Coastal Neighborhood Outreach Inc
EIN 320186278 · Headquarters: OCEANSIDE, CA, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N
- Oceanside Downtown Business Association
EIN 330721062 · Headquarters: OCEANSIDE, CA, US · Environment · Latest available filing year: 2008 · Primary form: IRS Form 990-N
- Oceanworks Foundation
EIN 934095069 · Headquarters: LOS ANGELES, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF
- Odd Plant
EIN 862777917 · Headquarters: Sacramento, CA, USA · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990-PF
- Off Trail on Track Inc
EIN 832093372 · Headquarters: Berkeley, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Offield Ocean Fund
EIN 461309989 · Headquarters: AVALON, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Offshore Wind California
EIN 842096843 · Headquarters: MENLO PARK, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Ofrenda Inc
EIN 352551590 · Headquarters: WATSONVILLE, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990
- Oil & Gas Action Network
EIN 820941015 · Headquarters: BERKELEY, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Ojai Adventure Club
EIN 842286581 · Headquarters: Ojai, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Ojai Childrens Memorial Garden
EIN 842108231 · Headquarters: Ojai, CA, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N
- Ojai Raptor Center
EIN 770543286 · Headquarters: Oak View, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990
- Ojai Trees
EIN 261940250 · Headquarters: Ojai, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Ojai Valley Defense Fund
EIN 270429286 · Headquarters: OJAI, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Ojai Valley Green Coalition
EIN 262157890 · Headquarters: Ojai, CA, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Ol Fashion Forth of July Committe of Half Moon Bay
EIN 942935766 · Headquarters: HALF MOON BAY, CA, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N
- Old Orchard Conservancy
EIN 460886849 · Headquarters: Santa Ana, CA, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N
- Old School Roundup Inc
EIN 863932958 · Headquarters: Indian Wells, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Old Town Atwater
EIN 842315073 · Headquarters: ATWATER, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Ollie Otter Society
EIN 831301868 · Headquarters: LOS ANGELES, CA, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N
- Omne
EIN 863287766 · Headquarters: Los Angeles, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- On the Brink Foundation
EIN 680528502 · Headquarters: Newport Beach, CA, US · Environment · Latest available filing year: 2014 · Primary form: IRS Form 990-N
- On Trail with Incorporated
EIN 384342668 · Headquarters: Covina, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- One Atmosphere
EIN 450548418 · Headquarters: San Francisco, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- One Child One Light
EIN 472186523 · Headquarters: Fremont, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- One Cool Earth
EIN 341939404 · Headquarters: San Luis Obispo, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990
- One Earth Designs Inc
EIN 270253576 · Headquarters: San Francisco, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ
- One Earth Philanthropy
EIN 852588841 · Headquarters: Culver City, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- One Green Step
EIN 931782980 · Headquarters: El Dorado Hills, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- One Habitat Foundation
EIN 830680858 · Headquarters: San Diego, CA, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N
- One Meter at a Time Foundation
EIN 900852969 · Headquarters: SOLANA BEACH, CA, USA · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-PF
- One People One Reef
EIN 850658879 · Headquarters: SOQUEL, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ
- One Piece Please
EIN 994684125 · Headquarters: san diego, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- One Planet Foundation
EIN 550903760 · Headquarters: Marina del Rey, CA, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N
- One World One Nation
EIN 333822690 · Headquarters: Los Angeles, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- ONeill Sea Odyssey
EIN 770464784 · Headquarters: Santa Cruz, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Onesimo Land Conservancy
EIN 454534815 · Headquarters: Bodega Bay, CA, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N
- Open Climate Tech Inc
EIN 850825357 · Headquarters: Los Altos, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Garden Day
EIN 920433265 · Headquarters: Santa Ana, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Sea Foundation
EIN 330410680 · Headquarters: San Diego, CA, US · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990-N
- Open Space Land Preserve Foundation
EIN 202611306 · Headquarters: CALABASAS, CA, USA · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-PF
- Open Space Legal Defense Fund Inc
EIN 273556299 · Headquarters: Whittier, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Space Management Inc
EIN 311646921 · Headquarters: IMPERIAL BEACH, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Open Space Preservation Society Inc
EIN 843564833 · Headquarters: San Francisco, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ
- Open Space Sausalito
EIN 471670327 · Headquarters: SAUSALITO, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ
- Open Space Trails Alliance
EIN 994480469 · Headquarters: Diablo, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Openfarm Inc
EIN 472888335 · Headquarters: San Luis Obispo, CA, US · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990-N
- Openoceans Global
EIN 262476179 · Headquarters: SAN DIEGO, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Operation Clean Slate
EIN 330584810 · Headquarters: COSTA MESA, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ
- Operation Safe Drinking Water
EIN 263619782 · Headquarters: Camarillo, CA, US · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-N
- OPS Foundation
EIN 203570498 · Headquarters: Greenbrae, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Orange Coast Watershed and Environmental Center
EIN 204377765 · Headquarters: Laguna Niguel, CA, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N
- Orange County Bonsai Society Inc
EIN 262874268 · Headquarters: Brea, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Orange County Coastkeeper
EIN 330847892 · Headquarters: Costa Mesa, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990
- Orange County Conservation Corps Charter School
EIN 455025266 · Headquarters: FULLERTON, CA, USA · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990
- Orange County Geranium Society
EIN 320124454 · Headquarters: YORBA LINDA, CA, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N
- Orange County Interfaith Coalition for the Environment
EIN 330700761 · Headquarters: TUSTIN, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Orange County Master Gardeners Inc
EIN 203179386 · Headquarters: Cypress, CA, US · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990-N
- Orange for Trees
EIN 330663386 · Headquarters: Orange, CA, US · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-N
- Orangegoesgreen Inc
EIN 461230932 · Headquarters: SAN ANSELMO, CA, USA · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-EZ
- Orchid Conservation Alliance
EIN 202382586 · Headquarters: SAN MATEO, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990
- Orchid Forum of Sacramento Incorporated
EIN 942312940 · Headquarters: ROSEVILLE, CA, US · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990-N
- Orchid Mania
EIN 943138750 · Headquarters: San Francisco, CA, US · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-N
- Orchid Society of California Inc
EIN 941198422 · Headquarters: OAKLAND, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Orchid Society of Santa Barbara Inc
EIN 237049010 · Headquarters: Santa Barbara, CA, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N
- Ore-cal Resource Conservation and Development Area Council
EIN 680323502 · Headquarters: YREKA, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Organic Gardening & Art Foundation
EIN 843696875 · Headquarters: ROSEMEAD, CA, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Organization of Regional Coastal Activists
EIN 200051282 · Headquarters: Malibu, CA, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N
- Organization Towards Agricultural Preservation
EIN 932288036 · Headquarters: Alamo, CA, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N
- Orinda Garden Club
EIN 942725254 · Headquarters: Orinda, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ
- Orion Energy Inc
EIN 612000111 · Headquarters: GLENDALE, CA, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N
- Orland Queen Bee Capital Organization
EIN 883715123 · Headquarters: Orland, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Ormond Beach Observers Inc
EIN 870765677 · Headquarters: Port Hueneme, CA, US · Environment · Latest available filing year: 2008 · Primary form: IRS Form 990-N
- Oroville Botanic Garden and Educational Center
EIN 814853232 · Headquarters: Oroville, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Orville Schell Farms Wildlife Preserve
EIN 990396591 · Headquarters: BOLINAS, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Ostrander Park Restoration Foundation
EIN 272947589 · Headquarters: Oakland, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Our Childrens Earth Foundation
EIN 943314819 · Headquarters: Napa, CA, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990
- Our City Forest
EIN 770371911 · Headquarters: SAN JOSE, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Our Cleaner Planet
EIN 831594115 · Headquarters: TEHACHAPI, CA, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Our Future Foundation
EIN 992580805 · Headquarters: LA JOLLA, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Our Truckee River Legacy Foundation Inc
EIN 680408369 · Headquarters: Truckee, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Ourmedia Inc
EIN 463546070 · Headquarters: PORTOLA VALLEY, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Outdoor Afro
EIN 473094045 · Headquarters: OAKLAND, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Outdoor Classroom Inc
EIN 954657356 · Headquarters: Pasadena, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Outdoor Recreation Education
EIN 814167899 · Headquarters: Joshua Tree, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Outer Jamul Fire Safe Council
EIN 263689640 · Headquarters: JAMUL, CA, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N
- Outfitters Legacy Project
EIN 334897933 · Headquarters: ETNA, CA, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Outward Bound Adventures
EIN 952561330 · Headquarters: Pasadena, CA, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Ovc Foundation
EIN 912162682 · Headquarters: Bishop, CA, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N
- Over the Top Volleyball Club
EIN 943483760 · Headquarters: YORBA LINDA, CA, USA · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990-EZ
- Overstand
EIN 874204822 · Headquarters: Little River, CA, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N
- Owl S Edge Inc
EIN 205974582 · Headquarters: San Diego, CA, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N
- Owls
EIN 870911724 · Headquarters: San Francisco, CA, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N
- Oyster Culture Foundation
EIN 331957107 · Headquarters: Santa Rosa, CA, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Pacific Alliance for Conservation and the Environment
EIN 270078473 · Headquarters: ROLLING HILLS ESTATES, CA, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N
- Pacific Beach Coalition
EIN 831241456 · Headquarters: Pacifica, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990
- Pacific Blue Foundation
EIN 562476116 · Headquarters: LA JOLLA, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Pacific Central Judging Center
EIN 270460265 · Headquarters: San Leandro, CA, US · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-N