Data / Nonprofits / Washington / Seattle / Environment
Environment nonprofits in Seattle, WA: 167 registered with the IRS
167 environment nonprofits are registered with the IRS in Seattle, WA, 161 of them 501(c)(3) charities; the 85 that report revenue took in $190.5 million. The largest by revenue: Nia Tero Foundation ($32.9 million), Forterra NW ($12.8 million), Grist Magazine Inc ($10.4 million).
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Every organization, largest by revenue first
| Organization | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|
| Nia Tero Foundation | 501(c)(3) | 2018 | $32.9 million | $80.6 million | 2024-12 |
| Forterra NW | 501(c)(3) | 1994 | $12.8 million | $45.5 million | 2024-12 |
| Grist Magazine Inc | 501(c)(3) | 2003 | $10.4 million | $11.6 million | 2025-09 |
| The Mountaineers | 501(c)(3) | 2011 | $7.9 million | $19.2 million | 2025-09 |
| Arboretum Foundation | 501(c)(3) | 1937 | $7.9 million | $14.4 million | 2025-06 |
| The Mountains To Sound Greenway Trust | 501(c)(3) | 1996 | $6.4 million | $6.3 million | 2025-06 |
| Splash International | 501(c)(3) | 2006 | $5.8 million | $4.9 million | 2025-12 |
| Washington Conservation Action Education Fund | 501(c)(3) | 1986 | $5.1 million | $9 million | 2024-12 |
| Delridge Neighborhoods Development Association | 501(c)(3) | 1996 | $5 million | $26.7 million | 2024-12 |
| Washington Maritime Blue | 501(c)(3) | 2020 | $4.8 million | $1.6 million | 2025-06 |
| Tilth Alliance | 501(c)(3) | 1997 | $4.7 million | $1.2 million | 2024-12 |
| Sightline Institute | 501(c)(3) | 1998 | $4.5 million | $8.1 million | 2025-12 |
| Conservation NW | 501(c)(3) | 1989 | $4.2 million | $2 million | 2025-03 |
| Ertv Compliance Group | 501(c)(4) | 2011 | $3.7 million | $1 million | 2024-12 |
| Utility Information Alliance | 501(c)(3) | 2023 | $3.7 million | $1.3 million | 2025-12 |
| Clean and Prosperous America | 501(c)(4) | 2025 | $3.6 million | $812,136 | 2025-12 |
| Toxic-Free Future | 501(c)(3) | 1984 | $3.6 million | $5.3 million | 2024-12 |
| Washington Farmland Trust | 501(c)(3) | 2000 | $3 million | $10.3 million | 2024-12 |
| Feel Good Action | 501(c)(3) | 2022 | $3 million | $1.1 million | 2024-12 |
| Building Transparency | 501(c)(3) | 2020 | $3 million | $7,396 | 2024-12 |
| 350 Seattle | 501(c)(3) | 2015 | $2.9 million | $1.5 million | 2024-12 |
| Birds Connect Seattle | 501(c)(3) | 1978 | $2.9 million | $6.1 million | 2025-06 |
| Initiative for Responsible Mining Assurance | 501(c)(3) | 2023 | $2.7 million | $4 million | 2024-12 |
| Duwamish River Cleanupcoalition-Technical Advisory Group | 501(c)(3) | 2006 | $2.7 million | $5.5 million | 2024-12 |
| Leading Harvest | 501(c)(3) | 2020 | $2.7 million | $4.3 million | 2024-12 |
| Washington Water Trust | 501(c)(3) | 1999 | $2.6 million | $2.2 million | 2024-12 |
| Front and Centered | 501(c)(3) | 2020 | $2.6 million | $2.6 million | 2023-12 |
| Environmental Coalition of South Seattle | 501(c)(3) | 1994 | $1.9 million | $1.2 million | 2025-12 |
| Clean and Prosperous America Action | 501(c)(4) | 2025 | $1.9 million | $1.5 million | 2025-12 |
| TFT | 501(c)(3) | 2011 | $1.7 million | $90,340 | 2024-12 |
| Urban Forest Carbon Registry | 501(c)(3) | 2016 | $1.7 million | $1.3 million | 2025-12 |
| Spark Northwest | 501(c)(3) | 2002 | $1.6 million | $1.5 million | 2025-12 |
| Clean and Prosperous America Education Fund | 501(c)(3) | 2023 | $1.5 million | $111,423 | 2025-12 |
| Fuse Washington | 501(c)(4) | 2007 | $1.5 million | $298,522 | 2025-06 |
| Sustainable Seattle | 501(c)(3) | 1998 | $1.4 million | $2 million | 2024-12 |
| Earthgen | 501(c)(3) | 2011 | $1.4 million | $853,269 | 2025-06 |
| Puget Soundkeeper Alliance | 501(c)(3) | 1985 | $1.4 million | $1.2 million | 2025-12 |
| Stewardship Partners | 501(c)(3) | 1999 | $1.3 million | $2 million | 2025-12 |
| Mini Mart City Park | 501(c)(3) | 2014 | $1.3 million | $2.8 million | 2025-12 |
| Basel Action Network | 501(c)(3) | 2009 | $1.2 million | $579,323 | 2024-12 |
| Fuse Innovation Fund | 501(c)(3) | 2007 | $1.2 million | $398,595 | 2025-06 |
| Mangrove Action Project | 501(c)(3) | 2006 | $1.2 million | $932,666 | 2024-12 |
| Northwest Natural Resource Group | 501(c)(3) | 1993 | $1.1 million | $559,737 | 2025-12 |
| Coastal and Estuarine Research Federation | 501(c)(3) | 2009 | $982,659 | $1.9 million | 2024-12 |
| Futurewise | 501(c)(3) | 1995 | $967,110 | $764,571 | 2024-12 |
| Historic Seattle Preservation FNDN | 501(c)(3) | 1996 | $807,411 | $446,522 | 2025-12 |
| National Association of Environmental Professionals Inc | 501(c)(3) | 1977 | $713,186 | $1.1 million | 2025-12 |
| Department of Bioregion | 501(c)(3) | 2025 | $695,862 | $419,065 | 2025-10 |
| Our Hope | 501(c)(3) | 2015 | $673,211 | $55,840 | 2024-12 |
| Global Ocean Health | 501(c)(3) | 1997 | $604,720 | $565,154 | 2026-03 |
| Washington Native Plant Society | 501(c)(3) | 1976 | $603,232 | $1 million | 2024-12 |
| Smart Buildings Center Education Program | 501(c)(3) | 2017 | $600,251 | $481,770 | 2025-12 |
| Foundation for Glacier & Environmental Research | 501(c)(3) | 2013 | $597,218 | $390,445 | 2024-12 |
| American Lands Project | 501(c)(3) | 2020 | $513,418 | $319,478 | 2024-12 |
| Hanford Challenge | 501(c)(3) | 2008 | $510,900 | $428,228 | 2024-12 |
| Braided River | 501(c)(3) | 2008 | $502,166 | $479,971 | 2025-09 |
| Seattle Reconomy | 501(c)(3) | 2014 | $384,298 | $159,253 | 2024-12 |
| Got Green | 501(c)(3) | 1995 | $354,188 | $2.2 million | 2024-12 |
| Soapbox Project | 501(c)(3) | 2024 | $231,842 | $62,838 | 2025-12 |
| Northwest Horticultural Society | 501(c)(3) | 1966 | $226,326 | $341,267 | 2024-12 |
| Washington Mass Timber Alliance | 501(c)(3) | 2025 | $188,577 | $19,305 | 2025-12 |
| Clean Washington Waters | 501(c)(3) | 2019 | $182,069 | $203,295 | 2025-12 |
| Belltown United | 501(c)(3) | 2025 | $150,192 | $30,943 | 2025-12 |
| Center for Environmental Law & Policy | 501(c)(3) | 1996 | $147,671 | $254,525 | 2024-12 |
| Gesneriad Society | 501(c)(3) | 1986 | $147,548 | $1.1 million | 2025-12 |
| Sustainable Ballard | 501(c)(3) | 2019 | $144,144 | $52,862 | 2025-12 |
| Sound Data Science A Nonprofit Corporation | 501(c)(3) | 2024 | $139,540 | $22,500 | 2025-12 |
| Friends of the Conservatory | 501(c)(3) | 1980 | $138,983 | $104,512 | 2025-12 |
| Indigenous Just Transition | 501(c)(3) | 2024 | $133,434 | $109,316 | 2025-12 |
| Seattle Garden Club | 501(c)(3) | 1995 | $131,342 | $647,032 | 2025-05 |
| Farmore Wa | 501(c)(3) | 2018 | $127,160 | $170,296 | 2025-12 |
| The English Springer Spaniel Field Trial Association Foundation Inc | 501(c)(3) | 1995 | $110,793 | $1 million | 2024-12 |
| 2030 Districts Network | 501(c)(3) | 2016 | $94,246 | $7,630 | 2024-12 |
| Native Habitat A Nonprofit Corporation | 501(c)(3) | 2016 | $83,422 | $23,893 | 2025-12 |
| Killer Whale Tales | 501(c)(3) | 2004 | $70,098 | $25,019 | 2025-06 |
| Solar Washington Association | 501(c)(3) | 2002 | $68,854 | $63,455 | 2025-12 |
| Northwest Ecobuilding Guild | 501(c)(3) | 1996 | $68,597 | $6,629 | 2025-12 |
| Washington Water Trails Association | 501(c)(3) | 1992 | $64,832 | $38,341 | 2024-12 |
| Northwest Orchid Society Inc | 501(c)(3) | 2011 | $35,890 | $89,160 | 2024-12 |
| Washington State Lake Protection Association | 501(c)(3) | 1998 | $34,167 | $36,390 | 2025-12 |
| Friends of North Creek Forest | 501(c)(3) | 2013 | $26,512 | $42,607 | 2025-12 |
| Schmitz Park Restore | 501(c)(3) | 2025 | $21,323 | $21,293 | 2025-12 |
| Cascade Backcountry Alliance | 501(c)(3) | 2024 | $6,933 | $45,372 | 2025-09 |
| Just Transition Voters | 501(c)(4) | 2024 | $6,843 | $125,418 | 2023-12 |
| Rbaw Marine Parks Conservancy | 501(c)(3) | 2020 | $5,504 | $2,419 | 2025-12 |
| Air and Waste Management Association - Puget Sound Chapter | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Alpine Lakes Foundation | 501(c)(3) | 1994 | $0 | $0 | 2024-12 |
| Alpine Lakes Protection Society | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Anthill Creations Inc | 501(c)(3) | 2024 | $0 | $0 | 2023-12 |
| Ardhi Yetu | 501(c)(3) | 2024 | |||
| Asian Research Institute for Environmental Law | 501(c)(3) | 2026 | |||
| Association for Washington Archaeology | 501(c)(3) | 1998 | $0 | $0 | 2026-03 |
| Better World Credits Inc | 501(c)(3) | 2009 | $0 | $0 | 2023-06 |
| Boreal Songbird Initiative | 501(c)(3) | 2002 | $0 | $22,552 | 2026-03 |
| Broadview Garden Club | 501(c)(3) | 2022 | $0 | $0 | 2025-09 |
| Bushwhacker Climbing Club | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Carbon Standard Dot Earth A Nonprofit Corporation | 501(c)(3) | 2022 | $0 | $147,766 | 2025-12 |
| Carbon Washington Foundation | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Category 5 Wetlands Watch Inc | 501(c)(3) | 2023 | $0 | $0 | 2025-01 |
| Citizens for Sensible Transportation Planning | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Clean Water Foundation A Nonprofit Corporation | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Co2 Foundation | 501(c)(3) | 2021 | $5.7 million | 2025-12 | |
| Coal Creek Community Coalition | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| Common Ground Wildlife | 501(c)(3) | 2026 | |||
| Crystal Conservation Coalition | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| Dukes Sustainable Solutions Foundation | 501(c)(4) | 2019 | $0 | $0 | 2024-12 |
| Earth Citizen Center | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Earth Daughters | 501(c)(3) | 2025 | $0 | $0 | 2026-01 |
| Earthsenseai Center | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Esw | 501(c)(3) | 2024 | |||
| Finca Dos Lados Reforestation Andresearch Project | 501(c)(3) | 2008 | $0 | $0 | 2025-12 |
| Foundation for Puget Sound | 501(c)(3) | 2009 | $0 | $0 | 2024-12 |
| Friends of Green Lake | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Friends of Nathan Hale Horticulture and Urban Farm | 501(c)(3) | 2016 | $0 | $0 | 2025-08 |
| Friends of Plant A Tree On Me A Green Cemetery Project | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Friends of Seattles Olmsted Parks | 501(c)(3) | 2014 | $0 | $0 | 2025-03 |
| Friends of Waterway 1 | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Friends of the Villa Community Forest | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Global Water Labs | 501(c)(3) | 2020 | $0 | $0 | 2024-12 |
| Green Strategies | 501(c)(3) | 2001 | $1 | 2014-12 | |
| Green Vegans | 501(c)(3) | 2013 | $0 | $0 | 2024-12 |
| Grow It Forward Restoration | 501(c)(3) | 2022 | $0 | $0 | 2026-06 |
| Herons Forever | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Hydros 2 Others A Nonprofit Corpora Tion | 501(c)(3) | 2026 | |||
| King County Iris Society | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Lakeridge Garden Club | 501(c)(3) | 2016 | $0 | $0 | 2026-06 |
| Magnuson Community Garden | 501(c)(3) | 2002 | $0 | $0 | 2025-09 |
| Magnuson Environmental Stewardship Alliance | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Naturus | 501(c)(3) | 2026 | |||
| Net Impact | 501(c)(3) | 2023 | $0 | $0 | 2023-12 |
| No Skids Movement | 501(c)(3) | 2025 | |||
| North Cascades Conservation Council | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| North End Flower Club | 501(c)(3) | 2014 | $0 | $0 | 2026-06 |
| Olmsted-Fairview Park Comission | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Olympic Environmental Council | 501(c)(3) | 1992 | $0 | $0 | 2024-12 |
| PNW Climate Week A Nonprofit Corporation | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Pacific Energy Institute | 501(c)(3) | 1984 | $0 | $0 | 2025-12 |
| Passage To Puget Sound | 501(c)(3) | 2026 | |||
| Pick It Up Seattle | 501(c)(3) | 2026 | |||
| Picture Perfect Queen Anne | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Puget Sound Wildscaping | 501(c)(3) | 2026 | |||
| Punta Tortuga Environmental Alliance | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Record Archive Restore Ecosystems | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Relove Lab | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Rooted Hands Collective | 501(c)(3) | 2025 | |||
| Rowan Institute | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Save Riviera Shoreline | 501(c)(3) | 2011 | $0 | $0 | 2023-12 |
| Save Union Bay Association | 501(c)(3) | 2011 | $0 | $0 | 2024-12 |
| Seattle Environmental Assiciation | 501(c)(3) | 2022 | $634 | 2024-12 | |
| Seattle Nature Alliance | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Society for Plant Signaling and Behavior | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Solar Pie | 501(c)(3) | 2014 | $0 | $0 | 2024-09 |
| Sphere One | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Streissguth Gardens Conservancy | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Stuntz Mycology Fund | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Tanan Enitadeg | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| The International Supreme Master Ching Hai Meditation Association | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| The Leaflight Inc | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Thornton Creek Alliance | 501(c)(3) | 1996 | $0 | $0 | 2026-02 |
| Tide SW Foundation | 501(c)(3) | 2021 | $2.5 million | 2025-12 | |
| Treeline Foundation | 501(c)(3) | 2014 | $750,377 | 2024-12 | |
| Walrus | 501(c)(3) | 2024 | |||
| Washington Butterfly Association | 501(c)(3) | 2015 | $0 | $0 | 2025-10 |
| Washington State Green Bank | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Waste Action Project | 501(c)(3) | 1995 | $0 | $0 | 2025-12 |
| Wild Steelhead Coalition | 501(c)(3) | 2001 | $0 | $0 | 2024-12 |
| Women in Environment - Puget Sound Chapter | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
Other causes in Seattle, WA
- Arts, culture and humanities 698
- Education 591
- Philanthropy, voluntarism and grantmaking foundations 405
- Human services 403
- Religion-related 332
- Community improvement and capacity building 304
- Recreation and sports 271
- Health care 163
- International, foreign affairs and national security 137
- Youth development 114
- Housing and shelter 89
- Crime and legal-related 89
- Public and societal benefit 84
- Civil rights, social action and advocacy 76
- Science and technology 71
- Animal-related 71
- Mental health and crisis intervention 71
- Employment 68
- Diseases, disorders and medical disciplines 51
- Food, agriculture and nutrition 45
- Mutual and membership benefit 40
- Medical research 34
- Public safety, disaster preparedness and relief 14
- Social science 10
Every nonprofit in Seattle, WA · Environment nonprofits across the state · Nonprofits in every city of the state
Read from the IRS Exempt Organizations Business Master File, updated by the IRS on October 24, 2026 and rebuilt here every morning. Revenue and assets are from each organization's latest filing as the IRS lists it; the IRS record is the official one. Organizations only: no people are named on these pages.