Data / Nonprofits / Hawaii / Honolulu / Environment
Environment nonprofits in Honolulu, HI: 107 registered with the IRS
107 environment nonprofits are registered with the IRS in Honolulu, HI, 104 of them 501(c)(3) charities; the 43 that report revenue took in $63.4 million. The largest by revenue: Elemental Excelerator Inc ($34.1 million), Hawaiian Islands Land Trust ($5.6 million), Re-Use Hawaii ($2.7 million).
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Every organization, largest by revenue first
| Organization | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|
| Elemental Excelerator Inc | 501(c)(3) | 2017 | $34.1 million | $55.2 million | 2024-12 |
| Hawaiian Islands Land Trust | 501(c)(3) | 2001 | $5.6 million | $39.3 million | 2024-12 |
| Re-Use Hawaii | 501(c)(3) | 2010 | $2.7 million | $2.1 million | 2025-09 |
| Hawaiian Legacy Reforestation Initiative | 501(c)(3) | 2014 | $2.5 million | $4.3 million | 2024-12 |
| Malama Maunalua | 501(c)(3) | 2010 | $2.4 million | $2 million | 2024-12 |
| Iole | 501(c)(3) | 2022 | $1.8 million | $3 million | 2024-12 |
| Waikiki Beach Special Improvement District Association | 501(c)(3) | 2015 | $1.4 million | $4.5 million | 2025-06 |
| Hawaii Conservation Alliancefoundation | 501(c)(3) | 2007 | $1.4 million | $2 million | 2024-12 |
| Pacific Rim Conservation Inc | 501(c)(3) | 2015 | $1.3 million | $727,267 | 2024-12 |
| Sustainable Coastlines Hawaii | 501(c)(3) | 2012 | $1.1 million | $878,252 | 2024-12 |
| Waiorg Inc | 501(c)(3) | 2019 | $971,432 | $472,925 | 2024-12 |
| Hawaii Water Environment Association | 501(c)(3) | 1993 | $952,876 | $854,202 | 2025-02 |
| Hawaii Nature Center Inc | 501(c)(3) | 1981 | $916,098 | $5 million | 2024-12 |
| Protect & Preserve Hawaii Inc | 501(c)(3) | 2019 | $523,832 | $114,335 | 2025-12 |
| John T Waterhouse Share No 4 Trust | 501(c)(3) | 1985 | $504,022 | $8.8 million | 2025-12 |
| 808 Cleanups | 501(c)(3) | 2015 | $408,604 | $401,096 | 2025-12 |
| Lyon Arboretum Association | 501(c)(3) | 1975 | $391,828 | $700,775 | 2024-12 |
| Blue Planet Foundation | 501(c)(3) | 2007 | $377,633 | $122,360 | 2024-12 |
| The Outdoor Circle | 501(c)(3) | 1953 | $340,696 | $1.8 million | 2025-09 |
| Maunalua Fishpond Heritage Center | 501(c)(3) | 2015 | $336,176 | $2.5 million | 2024-12 |
| Institute for Climate and Peace | 501(c)(3) | 2019 | $296,775 | $116,842 | 2023-12 |
| Conservation Council for Hawaii | 501(c)(3) | 1980 | $290,722 | $169,726 | 2025-12 |
| Hawaii Audubon Society | 501(c)(3) | 1954 | $273,452 | $163,486 | 2025-12 |
| Hawaii Seafood Council | 501(c)(3) | 2007 | $271,267 | $196,355 | 2025-12 |
| Hawaii Forest Institute | 501(c)(3) | 2004 | $263,830 | $187,821 | 2024-12 |
| Kanu Hawaii | 501(c)(3) | 2007 | $257,751 | $221,555 | 2024-12 |
| Aloha Tree Alliance | 501(c)(3) | 2021 | $256,483 | $177,992 | 2024-12 |
| Hiilei Aloha LLC | 501(c)(3) | 2008 | $204,600 | $20,110 | 2021-12 |
| Trees for Honolulus Future | 501(c)(3) | 2017 | $190,268 | $110,517 | 2025-12 |
| Friends of Honolulu Botanical Gardens | 501(c)(3) | 1963 | $175,294 | $900,059 | 2024-12 |
| Keiki and Plow | 501(c)(3) | 2018 | $172,084 | $58,818 | 2025-12 |
| Kahea the Hawaiian Environmental Alliance | 501(c)(3) | 2000 | $144,243 | $637,452 | 2025-06 |
| Garden Club of Honolulu | 501(c)(3) | 1909 | $131,121 | $551,067 | 2025-06 |
| Kakoo Lahui | 501(c)(3) | 2025 | $125,019 | $31,757 | 2025-12 |
| Plant A Tree Hawaii Inc | 501(c)(3) | 2019 | $103,605 | $79,887 | 2025-12 |
| Livable Hawaii Kai Hui | 501(c)(3) | 2021 | $89,045 | $11.2 million | 2023-12 |
| Worldopt Institute Inc | 501(c)(3) | 2019 | $58,166 | $1.6 million | 2024-12 |
| Friends of Hanauma Bay | 501(c)(3) | 1995 | $24,532 | $277,799 | 2024-12 |
| Friends of the National Parks Trust of the Virgin Islands Uk | 501(c)(3) | 2026 | $20,000 | $19,963 | 2025-12 |
| Trees To Seas Inc | 501(c)(3) | 2014 | $4,673 | $21,707 | 2025-06 |
| Waiea Water Foundation Inc | 501(c)(3) | 2023 | $1,000 | $1 | 2025-12 |
| Malama Pono Nui Loa | 501(c)(3) | 2023 | $195 | $295 | 2023-12 |
| Better Block Hawaii | 501(c)(3) | 2015 | $2 | $10,971 | 2025-12 |
| Aina Wellness Academy Inc | 501(c)(3) | 2021 | $0 | $1 | 2025-12 |
| Aloha Ocean Plus | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Andeerian | 501(c)(3) | 2025 | $0 | $0 | 2023-12 |
| Asta-Ja USA | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Babuhawaii Foundation | 501(c)(3) | 2020 | $0 | $0 | 2023-12 |
| Beach Environmental Awareness Campaign Hawaii | 501(c)(3) | 2013 | $0 | $0 | 2024-12 |
| Blue Ala Wai Canal Foundation | 501(c)(3) | 2024 | $0 | $276 | 2025-12 |
| Blue Ocean Futures | 501(c)(3) | 2026 | |||
| Blue Ocean Warriors | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Castiglione A Casauria Foundation | 501(c)(3) | 1999 | $2.8 million | 2025-12 | |
| Clean Water Initiative Inc | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Conservation Mind | 501(c)(3) | 2025 | $0 | $0 | 2025-06 |
| Dana Anne Yee Foundation | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Developing World Solar | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Exceptional Trees International | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Friends of Hawaiian Islands National Wildlife Refuge | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Friends of Kewalo | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Friends of Tantalus | 501(c)(3) | 2025 | |||
| Global Preservation Initiative Inc | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Halama Street Beach Restoration Inc | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Hawaii - American Nurses Association Foundation | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Hawaii Creative Reuse | 501(c)(3) | 2025 | |||
| Hawaii Harbors Coastal Cleanup | 501(c)(3) | 2025 | |||
| Hawaii Loa Ridge Preserve | 501(c)(3) | 2017 | $388,287 | 2025-12 | |
| Hawaii Nature Hui | 501(c)(3) | 2016 | $0 | $0 | 2024-12 |
| Hawaii Sakura Foundation | 501(c)(3) | 2017 | $7,420 | 2024-12 | |
| Hawaii Water Works Association | 501(c)(3) | 2022 | |||
| Hawaii Youth Climate Coalition | 501(c)(4) | 2021 | $0 | $0 | 2024-12 |
| Hele Mua Inc | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Hokupa A Foundation Incorporated | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Honolulu Orchid Society Inc | 501(c)(3) | 1952 | $0 | $0 | 2025-12 |
| Honolulu Umisakura | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Hoomau Ranch Conservancy | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Huli Hawaii Inc | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Japan Hawaii Wedding Association | 501(c)(3) | 2018 | $4,158 | 2025-03 | |
| Kai Makana Inc | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Kaimuki Orchid Society | 501(c)(5) | 2014 | $0 | $0 | 2024-12 |
| Kaulike Project | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Kohola Foundation | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Kuilei Cliffs | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Kuleana Innovations | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Living Roots Initiative | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Long Spoon Farms | 501(c)(3) | 2021 | $0 | $0 | 2024-03 |
| Love the Sea | 501(c)(3) | 2015 | $0 | $8,982 | 2026-03 |
| Malama Kipuka Hawaii | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Malama Makua | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Mission Sunrise Initiative | 501(c)(3) | 2025 | $0 | $0 | 2024-12 |
| Nanna I Bradford Foundation for Cle Anliness of the Ocean | 501(c)(3) | 2026 | |||
| Native Ecosystem Restoration Solutions | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Ocean Rescue Foundation | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Ohia Legacy Initiative | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Pacific Bonsai Club | 501(c)(5) | 2026 | |||
| Pono Ethos | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| Protect Our Ala Wai Watersheds | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Reef Scuba | 501(c)(3) | 2020 | $0 | $0 | 2025-06 |
| Roberts Hawaii Foundation | 501(c)(3) | 2016 | $0 | $50,926 | 2024-12 |
| Scenic Hawaii Inc | 501(c)(3) | 1996 | $0 | $0 | 2025-12 |
| Sea Inspiration | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Styrophobia | 501(c)(3) | 2015 | $0 | $0 | 2023-12 |
| The Coral Conservancy | 501(c)(3) | 2026 | $2,737 | 2021-12 | |
| Wavewerk | 501(c)(3) | 2025 | |||
| Western Pacific Regional Fishery Management Council | 501(c)(3) | 2013 | |||
| Weylin and Roselyn Eng Family Found Ation | 501(c)(3) | 2025 | $1 million | 2025-12 | |
| Zero Waste Hawaii | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
Other causes in Honolulu, HI
- Education 342
- Arts, culture and humanities 324
- Philanthropy, voluntarism and grantmaking foundations 260
- Religion-related 222
- Recreation and sports 205
- Human services 191
- Community improvement and capacity building 187
- Health care 113
- Youth development 86
- Housing and shelter 82
- Public and societal benefit 74
- International, foreign affairs and national security 39
- Animal-related 39
- Mental health and crisis intervention 37
- Mutual and membership benefit 33
- Employment 30
- Diseases, disorders and medical disciplines 29
- Crime and legal-related 26
- Public safety, disaster preparedness and relief 26
- Food, agriculture and nutrition 24
- Civil rights, social action and advocacy 20
- Science and technology 19
- Medical research 19
- Social science 3
Every nonprofit in Honolulu, HI · 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.