Data / Nonprofits / Wisconsin / Madison / Environment
Environment nonprofits in Madison, WI: 81 registered with the IRS
81 environment nonprofits are registered with the IRS in Madison, WI, 77 of them 501(c)(3) charities; the 37 that report revenue took in $79.5 million. The largest by revenue: Slipstream Group Inc ($41.1 million), Clean Wisconsin Inc ($5 million), Olbrich Botanical Society Inc ($3.7 million).
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Every organization, largest by revenue first
| Organization | Type | Since | Revenue | Assets | Filing |
|---|
| Slipstream Group Inc | 501(c)(3) | 1980 | $41.1 million | $32.1 million | 2024-12 |
| Clean Wisconsin Inc | 501(c)(3) | 1982 | $5 million | $6.6 million | 2025-12 |
| Olbrich Botanical Society Inc | 501(c)(3) | 1980 | $3.7 million | $6 million | 2024-12 |
| Savanna Institute | 501(c)(3) | 2015 | $3.6 million | $20.1 million | 2024-12 |
| Wisconsin Conservation Voices Inc | 501(c)(3) | 2002 | $2.9 million | $3.1 million | 2024-12 |
| Groundswell Conservancy Inc | 501(c)(3) | 1983 | $2.1 million | $10.2 million | 2025-06 |
| Cleantech Partners Inc | 501(c)(3) | 2004 | $2.1 million | $9 million | 2024-12 |
| Madison Environmental Resourcing Inc | 501(c)(3) | 1987 | $2.1 million | $0 | 2024-03 |
| Gathering Waters Inc | 501(c)(3) | 1995 | $1.8 million | $2.1 million | 2025-12 |
| Southern Wisconsin Bird Alliance Inc | 501(c)(3) | 1981 | $1.6 million | $24 million | 2025-12 |
| Wisconsin Land and Water Conservation Association Inc | 501(c)(3) | 1994 | $1.4 million | $1.5 million | 2024-12 |
| Renew Wisconsin Inc | 501(c)(3) | 1992 | $1.4 million | $1.8 million | 2025-06 |
| Olbrich Botanical Society Foundation Inc | 501(c)(3) | 2002 | $1.2 million | $9.6 million | 2024-12 |
| Rooted Wi Inc | 501(c)(3) | 1996 | $1 million | $3.7 million | 2024-12 |
| Sustain Dane Inc | 501(c)(3) | 2003 | $945,786 | $407,272 | 2024-12 |
| Clean Lakes Alliance Inc | 501(c)(3) | 2011 | $938,969 | $818,141 | 2024-12 |
| Wisconsin Wetlands Association Inc | 501(c)(3) | 1996 | $856,095 | $1 million | 2025-06 |
| North American Lake Management Society | 501(c)(3) | 1990 | $675,527 | $888,508 | 2024-12 |
| Wisconsins Green Fire Incorporated | 501(c)(3) | 2018 | $578,281 | $298,359 | 2024-12 |
| Bradley-Sigma Phi Historical Landmark Preservation Fund Inc | 501(c)(3) | 1991 | $513,002 | $527,096 | 2024-12 |
| Healthy Climate Wisconsin | 501(c)(3) | 2020 | $510,353 | $484,415 | 2025-12 |
| River Alliance of Wisconsin Inc | 501(c)(3) | 1994 | $477,469 | $1.2 million | 2025-09 |
| Mississippi River Parkway Commission | 501(c)(3) | 1979 | $475,322 | $902,881 | 2024-12 |
| Ursa Collective Incorporated | 501(c)(3) | 2025 | $414,739 | $758,661 | 2025-12 |
| 350 Wisconsin Inc | 501(c)(3) | 2016 | $410,413 | $102,257 | 2025-06 |
| International Energy Program Evaluation Conference | 501(c)(3) | 2009 | $348,615 | $208,041 | 2025-12 |
| 350 Wisconsin Action Inc | 501(c)(4) | 2023 | $300,666 | $154,815 | 2024-12 |
| Wisconsin Local Government Climate Coalition Inc | 501(c)(3) | 2024 | $186,815 | $383,230 | 2024-12 |
| North American Stormwater and Erosion Control Association of Wis | 501(c)(3) | 2016 | $154,565 | $72,794 | 2025-12 |
| Monarch Butterfly Fund | 501(c)(3) | 1998 | $149,934 | $111,371 | 2025-12 |
| Urban Tree Alliance | 501(c)(3) | 2012 | $127,455 | $21,340 | 2025-12 |
| Wisconsin Conservation and Education Foundation Inc | 501(c)(3) | 1998 | $126,913 | $373,893 | 2025-12 |
| International Union of Soil Sciences Inc | 501(c)(3) | 2014 | $118,811 | $1 million | 2024-12 |
| Environmental Sustainability Rotarian Action Group Inc | 501(c)(3) | 2016 | $109,986 | $168,960 | 2025-06 |
| Friends of the Arboretum | 501(c)(3) | 1989 | $82,297 | $148,112 | 2025-06 |
| International Association of Meteorology and Atmospheric Scienc | 501(c)(3) | 2022 | $60,423 | $385,452 | 2025-12 |
| Friends of Sylvania | 501(c)(3) | 2010 | $2,229 | $419,914 | 2025-12 |
| Ancient Earthworks Society of Wisconsin Inc | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| BT Farms Foundation Inc | 501(c)(3) | 2022 | $0 | $161,973 | 2024-12 |
| Blair Street Gardens Committee Inc | 501(c)(3) | 1985 | $0 | $0 | 2026-02 |
| Capitol Water Trails LTD | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Clean World Benefits Inc | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Climate Action Mapping Project Inc | 501(c)(3) | 2026 | | | |
| Environment & Public Health Networkfor Chinese Students and Scholars | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Environmental Data Institute Inc | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Franklin Lake Improvement Association | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Friends of Allen Centennial Gardens | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Friends of Cherokee Marsh Inc | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Friends of Indian Lake County Park | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Friends of Junction Ridge Park and Prairie | 501(c)(3) | 2026 | | | |
| Friends of Owen Conservation Park Inc | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Friends of Waubesa Wetlands Inc | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of the Lakeshore Nature Preserve Inc | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Gathering Waters Advocacy Fund Inc | 501(c)(4) | 2020 | $0 | $0 | 2025-12 |
| Green Forest Inc | 501(c)(3) | 2008 | | $4.7 million | 2025-12 |
| Healing Roots Collaborative | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Heartland Threads Inc | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Invasive Plants Association of Wisconsin Incorporated | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Ipm Voice Inc | 501(c)(3) | 2012 | $0 | $0 | 2024-12 |
| Land Conservation Association Inc | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Light Straw Clay Collaborative Inc | 501(c)(3) | 2013 | $0 | $0 | 2024-12 |
| Madison Area Master Gardeners Association Inc | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Mining Impact Coalition of Wisconsin Inc | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Mundo Sostenible | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Nationwide Trophy Recycling Program Inc | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Natural Resource Development Association Inc | 501(c)(4) | 2019 | $0 | $0 | 2025-12 |
| Outrider Foundation Inc | 501(c)(3) | 2000 | | $17.4 million | 2025-12 |
| Perch Lake Owners Association | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Quarks | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Rainbow Lake Association Inc | 501(c)(4) | 2005 | $0 | $0 | 2024-12 |
| Returned Peace Corps Volunteers for Environmental Action Inc | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Savanna Oak Foundation Inc | 501(c)(3) | 2000 | | $919,009 | 2024-12 |
| Shorewood Hills Garden Club | 501(c)(3) | 2024 | $0 | $0 | 2026-06 |
| Stop Global Warming Foundation Inc | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Turtles for Tomorrow LTD | 501(c)(3) | 2012 | $0 | $0 | 2023-12 |
| Wedel Oak Woods Foundation Inc | 501(c)(3) | 2018 | | $1.8 million | 2024-12 |
| Wild Harmony Nature Connection Inc | 501(c)(3) | 2026 | | | |
| Wisconsin Climbers Association | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Wisconsin Conservative Energy Forum Inc | 501(c)(3) | 2019 | $0 | $19,153 | 2023-12 |
| Wisconsin Distributed Resources Collaborative Inc | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Wisconsin Hardy Plant Society | 501(c)(3) | 2016 | $0 | $0 | 2025-10 |
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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.