Data / Nonprofits / Connecticut / Environment
Environment nonprofits in Connecticut: 441 registered with the IRS
441 environment nonprofits are registered with the IRS in Connecticut, 434 of them 501(c)(3) charities; the 183 that report revenue took in $179 million. The most are in New Haven (17), Stamford (13), Greenwich (12). The largest by revenue: Ocean Exploration Trust Inc ($19.3 million), Inclusive Prosperity Capital Inc ($10.8 million), Save the Sound Inc ($9.9 million).
SpecStream is the live web data engine for teams and agents. It reads the IRS register of exempt organizations as the IRS updates it, and this page is that reading. Ask for the nonprofits you need by place, cause and size, with their latest Form 990 figures and websites, and they arrive in your sheet, CRM, Slack or agent.
Every organization, largest by revenue first
| Organization | City | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Ocean Exploration Trust Inc | New London | 501(c)(3) | 2008 | $19.3 million | $12.1 million | 2024-12 |
| Inclusive Prosperity Capital Inc | Hartford | 501(c)(3) | 2018 | $10.8 million | $39.2 million | 2024-12 |
| Save the Sound Inc | New Haven | 501(c)(3) | 1994 | $9.9 million | $22 million | 2025-09 |
| Northwest Connecticut Land Conservancy Inc | Kent | 501(c)(3) | 1966 | $9.6 million | $83.2 million | 2024-12 |
| The Connecticut Audubon Society Incorporated | Fairfield | 501(c)(3) | 1942 | $8.4 million | $71.9 million | 2025-04 |
| Keep America Beautiful Inc | Stamford | 501(c)(3) | 1955 | $7.7 million | $4.8 million | 2024-12 |
| Garden Conservancy Inc | Greenwich | 501(c)(3) | 1990 | $7.7 million | $44.9 million | 2025-12 |
| Steep Rock Association Inc | Washington DT | 501(c)(3) | 1943 | $4.6 million | $32.4 million | 2025-09 |
| Connecticut Citizen Research Group Inc | Hartford | 501(c)(3) | 1972 | $4.3 million | $6.7 million | 2024-12 |
| Earthplace the Nature Discovery Center Inc | Westport | 501(c)(3) | 1959 | $4.1 million | $7.8 million | 2025-06 |
| Connecticut Land Conservation Council Inc | Middletown | 501(c)(3) | 2017 | $3.7 million | $4.4 million | 2024-12 |
| CT Energy Efficiency Finance Company | Wallingford | 501(c)(3) | 2012 | $3.6 million | $40.8 million | 2025-03 |
| Sound Waters Inc | Stamford | 501(c)(3) | 1989 | $3.3 million | $17.8 million | 2025-06 |
| Sharon Land Trust Inc | Sharon | 501(c)(3) | 1983 | $3 million | $21.9 million | 2024-12 |
| Aspetuck Land Trust Inc | Fairfield | 501(c)(3) | 1967 | $2.8 million | $64.4 million | 2024-12 |
| Land Trust of Darien Inc | Darien | 501(c)(3) | 1964 | $2.8 million | $38 million | 2025-06 |
| Winchester Land Trust Inc | Winchestr Center | 501(c)(3) | 1994 | $2.7 million | $8.9 million | 2025-12 |
| Wyndham Land Trust Inc | Pomfret Center | 501(c)(3) | 1991 | $2.4 million | $22.4 million | 2025-12 |
| New Canaan Nature Center Association Inc | New Canaan | 501(c)(3) | 1962 | $2.3 million | $4.4 million | 2025-06 |
| Housatonic Valley Association Inc | Cornwall BRG | 501(c)(3) | 1999 | $2.3 million | $1.9 million | 2025-06 |
| Wholesome Wave Inc | Bridgeport | 501(c)(3) | 2007 | $2.1 million | $912,332 | 2024-12 |
| Bridgewater Land Trust Inc | Bridgewater | 501(c)(3) | 1987 | $2 million | $9.1 million | 2025-12 |
| Roxbury Land Trust Inc | Roxbury | 501(c)(3) | 1971 | $1.9 million | $35.6 million | 2025-12 |
| Flanders Nature Center Inc Van Vleck Farm | Woodbury | 501(c)(3) | 1964 | $1.7 million | $12.9 million | 2024-12 |
| Connecticut Resource Conservation and Development Area Inc | Haddam | 501(c)(3) | 1978 | $1.7 million | $1.3 million | 2025-06 |
| Holcomb Farm Inc | West Granby | 501(c)(3) | 1994 | $1.6 million | $1.5 million | 2025-12 |
| Climate Change for All Educators Inc | New Canaan | 501(c)(3) | 2021 | $1.5 million | $0 | 2024-12 |
| Avalonia Land Conservancy Inc | Ledyard | 501(c)(3) | 1968 | $1.4 million | $25.3 million | 2024-12 |
| Denison Pequotsepos Nature Center Inc | Mystic | 501(c)(3) | 1973 | $1.4 million | $10.6 million | 2025-09 |
| Greater Bridgeport Communityenterprises Inc - Gbce | Bridgeport | 501(c)(3) | 2009 | $1.4 million | $1.2 million | 2024-06 |
| Bartlett Arboretum Association Inc | Stamford | 501(c)(3) | 1966 | $1.3 million | $2.5 million | 2025-06 |
| New Pond Farm Education Center Inc | West Redding | 501(c)(3) | 1984 | $1.3 million | $9.6 million | 2025-09 |
| White Memorial Conservation Center Inc | Litchfield | 501(c)(3) | 1964 | $1.3 million | $10.8 million | 2025-12 |
| Environmental Learning Centers of Connecticut Inc | Bristol | 501(c)(3) | 1971 | $1.2 million | $16.2 million | 2025-09 |
| Lyme Land Conservation Trust Inc | Old Lyme | 501(c)(3) | 1966 | $1.2 million | $13 million | 2025-06 |
| Darien Nature Center Inc | Darien | 501(c)(3) | 1981 | $1.2 million | $2.8 million | 2024-12 |
| Renew Northeast Inc | Madison | 501(c)(6) | 2011 | $1.2 million | $1.3 million | 2025-12 |
| North Central Conservation District Inc | Vernon | 501(c)(3) | 1979 | $1.1 million | $1 million | 2025-06 |
| McLean Game Refuge Inc | Simsbury | 501(c)(3) | 2008 | $1.1 million | $5.3 million | 2025-09 |
| The Greenwich Land Trust Inc | Greenwich | 501(c)(3) | 1977 | $1 million | $115 million | 2024-12 |
| The Last Green Valley Inc | Danielson | 501(c)(3) | 1996 | $1 million | $1.3 million | 2025-09 |
| Litchfield Land Trust Inc | Litchfield | 501(c)(3) | 1968 | $999,355 | $12.9 million | 2024-12 |
| East Haddam Land Trust Inc | East Haddam | 501(c)(3) | 1979 | $972,192 | $4.3 million | 2024-12 |
| Reforest the Tropics Inc | Mystic | 501(c)(3) | 1996 | $964,842 | $1.5 million | 2024-12 |
| Colebrook Land Conservancy Inc | Colebrook | 501(c)(3) | 1986 | $930,467 | $4.3 million | 2025-12 |
| Essex Land Trust Inc | Essex | 501(c)(3) | 1968 | $911,371 | $10.6 million | 2024-12 |
| Madison Land Conservation Trust Inc | Madison | 501(c)(3) | 1964 | $866,125 | $793,088 | 2024-12 |
| Greenwich Botanical Center Inc | Cos Cob | 501(c)(3) | 1957 | $820,650 | $886,344 | 2025-06 |
| Pratt Nature Center Inc | New Milford | 501(c)(3) | 1971 | $814,239 | $3.2 million | 2024-12 |
| Gather New Haven | New Haven | 501(c)(3) | 1982 | $800,527 | $1.8 million | 2024-12 |
| Woodcock Nature Center Inc | Wilton | 501(c)(3) | 1972 | $771,667 | $738,191 | 2024-12 |
| Global 2050 Inc | Old Lyme | 501(c)(3) | 2025 | $746,290 | $347,230 | 2025-12 |
| Granby Land Trust Inc | Granby | 501(c)(3) | 1973 | $705,203 | $16.1 million | 2025-12 |
| Warren Land Trust Inc | Warren | 501(c)(3) | 1990 | $673,380 | $5.4 million | 2025-06 |
| Farmington River Watershed Association Inc | Simsbury | 501(c)(3) | 1958 | $645,584 | $2.9 million | 2025-06 |
| Joshuas Tract Conservation & Historic Trust | Mansfield Center | 501(c)(3) | 1967 | $644,297 | $20 million | 2025-06 |
| Westport Womans Club Inc | Westport | 501(c)(3) | 1967 | $640,084 | $2.7 million | 2025-08 |
| Efficiency for All Inc | Windsor | 501(c)(3) | 2018 | $625,455 | $245,357 | 2024-12 |
| Northwest Conservation District Inc | Torrington | 501(c)(3) | 1972 | $598,298 | $1.3 million | 2025-06 |
| Friends of the Norwalk River Valley Trail Inc | Georgetown | 501(c)(3) | 2012 | $582,863 | $653,159 | 2025-06 |
| Southwest Conservation District Inc | Hamden | 501(c)(3) | 1983 | $582,385 | $542,212 | 2025-06 |
| Bolton Land Trust Inc | Bolton | 501(c)(3) | 2001 | $580,842 | $3.4 million | 2025-06 |
| Hartford Land Bank Inc | Hartford | 501(c)(3) | 2019 | $556,507 | $3.6 million | 2025-06 |
| North American Environment Protection Association Inc | Weston | 501(c)(3) | 2009 | $521,785 | $78,183 | 2025-09 |
| Farmington Land Trust Inc | Unionville | 501(c)(3) | 1971 | $498,826 | $7.4 million | 2025-12 |
| Middlebury Land Trust Inc | Middlebury | 501(c)(3) | 1970 | $498,137 | $7 million | 2024-12 |
| Lake Waramaug Task Force Inc | Warren | 501(c)(3) | 1982 | $487,596 | $1.6 million | 2025-12 |
| Waveny Park Conservancy Inc | New Canaan | 501(c)(3) | 2015 | $476,116 | $782,778 | 2024-12 |
| Branford Land Trust Inc | Branford | 501(c)(3) | 1968 | $470,786 | $16.2 million | 2025-04 |
| Guilford Land Conservation Trust Inc | Guilford | 501(c)(3) | 1969 | $466,274 | $11.7 million | 2025-12 |
| Connecticut Roundtable On Climate and Jobs | Clinton | 501(c)(3) | 2018 | $453,965 | $51,369 | 2024-12 |
| Redding Land Trust Incorporated | Redding Center | 501(c)(3) | 1966 | $429,731 | $3.6 million | 2025-12 |
| Live Green Connecticut Inc | Fairfield | 501(c)(3) | 2014 | $415,786 | $32,113 | 2024-12 |
| Wilton Land Conservation Trust | Wilton | 501(c)(3) | 1964 | $403,466 | $3.5 million | 2025-12 |
| Havens Harvest Inc | New Haven | 501(c)(3) | 2023 | $350,790 | $98,355 | 2024-12 |
| Alliance for the Mystic River Watershed Inc | Mystic | 501(c)(3) | 2022 | $346,086 | $71,559 | 2025-12 |
| Kent Land Trust Inc | Kent | 501(c)(3) | 1994 | $335,603 | $13.9 million | 2024-12 |
| Greenwich Tree Conservancy Inc | Greenwich | 501(c)(3) | 2007 | $332,641 | $1.5 million | 2025-12 |
| Chatham Rock Island Inc | Stamford | 501(c)(3) | 2023 | $330,483 | $991,180 | 2025-12 |
| Connecticut River Coastal Conservation District Inc | Middletown | 501(c)(3) | 1986 | $328,181 | $614,984 | 2026-06 |
| Connecticut Tree Protective Association Inc | Wallingford | 501(c)(3) | 1979 | $322,627 | $535,510 | 2025-09 |
| Pomperaug River Watershed Coalition Inc | Woodbury | 501(c)(3) | 2000 | $314,851 | $478,705 | 2025-06 |
| Oseas Conservation Foundation | Ridgefield | 501(c)(3) | 2014 | $311,224 | $206,287 | 2025-12 |
| Connecticut Wind Collaborative Inc | Groton | 501(c)(3) | 2025 | $304,851 | $433,580 | 2024-12 |
| New Canaan Beautification League Inc | New Canaan | 501(c)(3) | 1967 | $259,971 | $1.8 million | 2025-08 |
| Aton Forest Inc Paul Lagel | Norfolk | 501(c)(3) | 1990 | $255,350 | $5.5 million | 2025-12 |
| Huneebee Project Inc | New Haven | 501(c)(3) | 2021 | $245,812 | $52,059 | 2024-12 |
| Bethany Land Trust Incorporated | Bethany | 501(c)(3) | 1968 | $245,524 | $1.5 million | 2025-04 |
| Greenwich Point Conservancy Inc | Old Greenwich | 501(c)(3) | 2024 | $233,590 | $1.3 million | 2025-12 |
| Friends of the Ansonia Nature Center | Ansonia | 501(c)(3) | 1993 | $229,712 | $275,422 | 2025-06 |
| Community Voice Channel | Bolton | 501(c)(3) | 2022 | $224,325 | $408,311 | 2025-12 |
| Norwalk River Watershed Association Inc | Wilton | 501(c)(3) | 1999 | $222,427 | $782,733 | 2025-12 |
| Middlesex Land Trust | Middletown | 501(c)(3) | 1996 | $218,237 | $6.7 million | 2024-12 |
| Simsbury Land Trust Inc | Simsbury | 501(c)(3) | 1977 | $217,828 | $15.8 million | 2025-06 |
| Keep Stamford Beautiful Inc | Stamford | 501(c)(3) | 1999 | $210,544 | $160,776 | 2025-06 |
| Haddam Land Trust Inc | Haddam | 501(c)(3) | 1966 | $209,875 | $3.6 million | 2024-12 |
| Collective Oyster Recycling & Restoration Foundation | Fairfield | 501(c)(3) | 2023 | $199,558 | $122,473 | 2025-12 |
| Federated Garden Clubs of Connecticut Inc | Wallingford | 501(c)(3) | 1967 | $191,991 | $490,519 | 2025-12 |
| Jonah Center Inc | Portland | 501(c)(3) | 2005 | $191,199 | $196,224 | 2026-06 |
| Southbury Land Trust Inc | Southbury | 501(c)(3) | 1978 | $175,863 | $12 million | 2024-12 |
| Direct Air Capture Coalition Inc | Westport | 501(c)(3) | 2023 | $171,185 | $151,062 | 2024-12 |
| Friends of Hammonasset Inc | Madison | 501(c)(3) | 1999 | $167,969 | $780,187 | 2025-12 |
| Buildgreenct Inc | New Haven | 501(c)(3) | 2003 | $161,690 | $61,570 | 2024-12 |
| Bantam Lake Protective Association Incorporated | Bantam | 501(c)(3) | 2012 | $160,739 | $304,102 | 2025-12 |
| Federated Garden Clubs of Connecticut Inc | New Canaan | 501(c)(3) | 1967 | $152,422 | $957,494 | 2025-06 |
| Berlin Land Trust Inc | Berlin | 501(c)(3) | 1988 | $151,976 | $2.5 million | 2025-12 |
| Colchester Land Trust Inc | Colchester | 501(c)(3) | 2004 | $150,649 | $1.1 million | 2024-12 |
| Groton Open Space Association Inc | Groton | 501(c)(3) | 1997 | $150,404 | $7.1 million | 2025-12 |
| Old Lyme Land Trust Inc | Old Lyme | 501(c)(3) | 1966 | $147,480 | $8.8 million | 2025-12 |
| Pollinator Pathway Inc | Wilton | 501(c)(3) | 2022 | $147,458 | $223,544 | 2025-12 |
| Edgerton Park Conservancy Inc | Hamden | 501(c)(3) | 1972 | $146,994 | $511,159 | 2025-05 |
| Everyone Outside | Durham | 501(c)(3) | 2015 | $144,128 | $80,820 | 2025-12 |
| Norfolk Land Trust Inc | Norfolk | 501(c)(3) | 1983 | $144,019 | $5.7 million | 2025-12 |
| Inter Religious Eco-Justice Network | Preston | 501(c)(3) | 2003 | $141,271 | $227,432 | 2024-12 |
| Connecticut Sustainable Business Council Inc | Bethel | 501(c)(3) | 2021 | $132,095 | $43,720 | 2024-12 |
| Blau House & Gardens Inc | Westport | 501(c)(3) | 2022 | $127,420 | $117,335 | 2025-12 |
| Canton Land Conservation Trust Inc | Canton Center | 501(c)(3) | 1972 | $125,994 | $8.9 million | 2024-12 |
| Greenwich Green and Clean Inc | Greenwich | 501(c)(3) | 1987 | $124,449 | $438,254 | 2025-12 |
| Connecticut Horticultural Soc Inc | West Hartford | 501(c)(3) | 1966 | $119,119 | $1.3 million | 2025-08 |
| North Woods Land Conservancy Inc | East Hartland | 501(c)(3) | 2007 | $119,042 | $978,911 | 2024-12 |
| Newtown Forest Association Inc | Newtown | 501(c)(3) | 1940 | $109,387 | $8.8 million | 2025-09 |
| Mill River Wetland Committee Inc | Fairfield | 501(c)(3) | 1970 | $107,773 | $211,498 | 2025-12 |
| The Claire C Ennitt Watershed Fund Inc | New Haven | 501(c)(3) | 1999 | $103,455 | $2 million | 2025-05 |
| Litchfield Hills Audubon Society Inc | Litchfield | 501(c)(3) | 1960 | $102,896 | $2.2 million | 2023-04 |
| The Lake Waramaug Association Inc | New Preston | 501(c)(3) | 1995 | $101,953 | $369,925 | 2025-12 |
| Sisters Journey Inc | New Haven | 501(c)(3) | 2004 | $94,648 | $43,978 | 2025-12 |
| Save the River-Save the Hills | Waterford | 501(c)(3) | 2001 | $93,269 | $282,533 | 2025-12 |
| Litchfield Hills Conservancy Inc | Winsted | 501(c)(3) | 2009 | $90,339 | $29,651 | 2025-12 |
| Federated Garden Clubs of Connecticut Inc | Essex | 501(c)(3) | 1967 | $83,681 | $96,602 | 2025-08 |
| Federated Garden Clubs of Connecticut Inc | Wilton | 501(c)(3) | 1967 | $77,684 | $299,085 | 2025-06 |
| Salem Land Trust | Salem | 501(c)(3) | 1999 | $76,461 | $2.8 million | 2025-12 |
| Rivers Alliance of Connecticut Inc | Litchfield | 501(c)(3) | 1994 | $74,516 | $3,968 | 2025-08 |
| Old Saybrook Land Trust Inc | Old Saybrook | 501(c)(3) | 1997 | $73,834 | $1.7 million | 2025-12 |
| Federated Garden Clubs of Connecticut Inc | Madison | 501(c)(3) | 1967 | $73,109 | $761,918 | 2025-12 |
| Drop of Life Corporation | Southbury | 501(c)(3) | 2020 | $71,456 | $14,550 | 2025-12 |
| Tyler Lake Protective Association | Goshen | 501(c)(3) | 2016 | $69,537 | $87,960 | 2025-12 |
| Hortulus Inc | Greenwich | 501(c)(3) | 1967 | $68,345 | $284,027 | 2026-06 |
| Federated Garden Clubs of Connecticut Inc | Greenwich | 501(c)(3) | 1967 | $68,039 | $295,624 | 2025-06 |
| Federated Garden Clubs of Connecticut Inc | Greenwich | 501(c)(3) | 1967 | $66,526 | $202,984 | 2025-06 |
| Wellspring Commons Stewards Inc | Litchfield | 501(c)(3) | 2023 | $65,778 | $30,567 | 2024-12 |
| National Environmental Balancing Inc | Windsor | 501(c)(6) | 1973 | $65,126 | $82,286 | 2025-12 |
| Stamford Land Conservation Trust Inc | Stamford | 501(c)(3) | 1972 | $63,633 | $60.8 million | 2025-12 |
| Kent Land Trust Foundation Inc | Kent | 501(c)(3) | 2001 | $63,468 | $3.3 million | 2024-12 |
| Suffield Land Conservancy Inc | Suffield | 501(c)(3) | 1980 | $63,342 | $4.1 million | 2025-09 |
| Ash Creek Conservation Association Inc | Bridgeport | 501(c)(3) | 2004 | $61,141 | $53,861 | 2025-12 |
| Northern Connecticut Land Trust Inc | Somers | 501(c)(3) | 1988 | $58,943 | $8.1 million | 2025-07 |
| Hudson Bay Project Corporation | Redding | 501(c)(3) | 1996 | $57,673 | $306,518 | 2025-12 |
| Friends of the Lake Inc | Bridgewater | 501(c)(3) | 2004 | $55,918 | $146,652 | 2025-12 |
| Save New Canaan Inc | New Canaan | 501(c)(3) | 2023 | $54,559 | $17,090 | 2025-12 |
| Sasco Creek Neighbors Environmental Trust | Southport | 501(c)(3) | 2023 | $53,046 | $66,032 | 2025-12 |
| New Haven Green Fund Inc | New Haven | 501(c)(3) | 2009 | $51,921 | $1.5 million | 2024-12 |
| Ecoworks Inc | North Haven | 501(c)(3) | 2014 | $45,888 | $22,640 | 2025-12 |
| Reconnstruction Center Inc | New Britain | 501(c)(3) | 2003 | $45,200 | $11,358 | 2025-06 |
| Brass Center LTD | Waterbury | 501(c)(3) | 1995 | $45,000 | $613 | 2025-05 |
| Friends of Gillette Castle State Park Inc | East Haddam | 501(c)(3) | 2015 | $44,351 | $110,236 | 2025-12 |
| Perry House Foundation Inc | Stratford | 501(c)(3) | 2004 | $43,700 | $61,785 | 2024-12 |
| Indian Lake Association of CT & Ny | Sharon | 501(c)(3) | 2008 | $40,500 | $34,834 | 2025-06 |
| Lake Quassapaug Association Inc | Middlebury | 501(c)(3) | 2014 | $40,391 | $96,113 | 2025-12 |
| The Woodbridge Land Trust Incorporated | Woodbridge | 501(c)(3) | 1964 | $37,911 | $3.3 million | 2024-12 |
| Great Island Preservation Inc | Darien | 501(c)(3) | 2025 | $36,148 | $234 | 2025-12 |
| Ridgefield Garden Club Inc | Ridgefield | 501(c)(3) | 1999 | $34,022 | $100,326 | 2025-06 |
| Stonington Land Trust Inc | Stonington | 501(c)(3) | 2007 | $32,415 | $2.8 million | 2025-06 |
| Going Coastal Inc | Stamford | 501(c)(3) | 2003 | $29,682 | $592,003 | 2025-12 |
| Quinnipiac River Watershed Association | Meriden | 501(c)(3) | 1983 | $27,372 | $62,952 | 2025-12 |
| Mad Gardeners Inc | Sherman | 501(c)(3) | 2002 | $25,294 | $47,275 | 2025-12 |
| Morris Land Trust Inc | Bantam | 501(c)(3) | 2008 | $24,978 | $2.2 million | 2025-12 |
| The Fairfield Garden Club Inc | Southport | 501(c)(3) | 2019 | $21,048 | $139,237 | 2025-06 |
| Merritt Parkway Conservancy Inc | Stamford | 501(c)(3) | 2002 | $20,158 | $139,532 | 2025-06 |
| Land Conservancy of Ridgefield Inc | Ridgefield | 501(c)(3) | 1967 | $19,880 | $9.5 million | 2025-12 |
| Park City Compost Initiative Inc | Bridgeport | 501(c)(3) | 2022 | $16,577 | $53,245 | 2025-12 |
| Save Ocean Beach Inc | New London | 501(c)(3) | 2000 | $16,020 | $47,699 | 2025-12 |
| Race Against Time Inc | Hartford | 501(c)(3) | 2023 | $13,700 | $1 | 2024-12 |
| Institute for Ocean Studies | North Haven | 501(c)(3) | 1998 | $10,021 | $198,825 | 2025-12 |
| Heritage Land Preservation Trust Inc | Torrington | 501(c)(3) | 2016 | $8,869 | $2.1 million | 2026-02 |
| Remarkable Steam Inc | Westport | 501(c)(3) | 2014 | $4,834 | $9,309 | 2025-12 |
| King Cobra Conservancy | Berlin | 501(c)(3) | 2017 | $3,694 | $3,303 | 2025-12 |
| Stony Hill Preserve | Hawleyville | 501(c)(3) | 2017 | $3,036 | $101,925 | 2025-09 |
| East River Watershed Research Institute Inc | Orange | 501(c)(3) | 2022 | $978 | $1 | 2024-12 |
| Rockwell Street Gardens Inc | Norwich | 501(c)(3) | 2020 | $900 | $1,974 | 2023-12 |
| Green Eco Warriors Inc | Windsor | 501(c)(3) | 2014 | $762 | $20,129 | 2024-12 |
| Friends of White Deer Rock Inc | Middlebury | 501(c)(3) | 2020 | $200 | $18,953 | 2025-12 |
| Caretakers of Soapstone Mountain Inc | Somers | 501(c)(3) | 2016 | $20 | $14,568 | 2024-12 |
| Environmental Health Institute of Connecticut Inc | Ellington | 501(c)(3) | 2022 | $5 | $10,504 | 2024-12 |
| 10000 Hawks Inc | New Haven | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| 36 Tower Lane Inc | New Haven | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| 4 Conservation Charitable Foundation | New London | 501(c)(3) | 2024 | $0 | $0 | 2025-07 |
| Alewife Cove Conservancy | New London | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| American Wanderer Foundation | Weston | 501(c)(3) | 2008 | $0 | $0 | 2025-12 |
| Amos Lake Association | Preston | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Ar Rahman Corp | West Hartford | 501(c)(3) | 2025 | |||
| Art for A Cause Pollinator Garden | Southington | 501(c)(3) | 2024 | $0 | $0 | 2025-03 |
| Association for the Protection of C Onnecticut Lakes | Washington DT | 501(c)(3) | 2026 | |||
| Avon Land Trust Inc | Avon | 501(c)(3) | 2020 | $0 | $0 | 2025-06 |
| Bashan Lake Association | East Haddam | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Bayside Beach Association Inc | Waterford | 501(c)(7) | 2012 | $0 | $0 | 2026-05 |
| Bethany Community Garden Inc | Bethany | 501(c)(3) | 2016 | $0 | $0 | 2025-11 |
| Better Planet Fund | Wilton | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Beverage Container Stewardship Connecticut Inc | West Hartford | 501(c)(3) | 2022 | $0 | $0 | 2025-06 |
| Bioplanning Institute Inc | South Kent | 501(c)(3) | 2025 | |||
| Bird Conservation Research Inc | East Haddam | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Blackberry River Valley Protection Alliance Inc | East Canaan | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Blueoceanz Inc | New Canaan | 501(c)(3) | 2024 | $0 | $21,344 | 2025-12 |
| Brandegee Lake Association Co | Waterford | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Bridle Path Conservancy Inc | Westbrook | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Bringing Accountability for Sherwin S Harms-Bash | Stamford | 501(c)(3) | 2026 | |||
| Burleson Institute Inc | Cos Cob | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| CT Feral Cats Metal for Meals Inc | Manchester | 501(c)(3) | 2023 | |||
| Cans-4-A-Cause of Greater Middletown | Middletown | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Center for Coastal Preservation Inc | Wilton | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Chantecaille Family Foundation | Greenwich | 501(c)(3) | 2022 | $154.4 million | 2024-12 | |
| Charles Island Reforestation LLC | Wallingford | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Cheshire Pollinator Pathway Inc | Cheshire | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Chester Land Trust | Chester | 501(c)(3) | 1989 | $0 | $0 | 2025-12 |
| Citizens for Easton | Easton | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Clinton Arbor Garden Club | Clinton | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Coastal Environmental Services Inc | Mystic | 501(c)(3) | 2008 | $0 | $0 | 2024-12 |
| Coeea Fund Inc | West Hartford | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Connecticut Agricultural Experiment Station Research Foundation Inc | New Haven | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Connecticut Association of Conservation & Inland Wetlands | Middletown | 501(c)(3) | 1997 | $0 | $0 | 2026-06 |
| Connecticut Botanical Society Inc | Kensington | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Connecticut Brownfield Land Bank | Essex | 501(c)(3) | 2023 | |||
| Connecticut Butterfly Association Inc | Wallingford | 501(c)(3) | 1995 | $0 | $0 | 2026-03 |
| Connecticut Chapter of Achmm Inc | Plainville | 501(c)(3) | 2007 | $453 | 2025-12 | |
| Connecticut Clean Communities Advisory Inc | Woodbury | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Connecticut Clean Waterways Project Inc | Old Saybrook | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Connecticut Community Gardening Association | New Haven | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Connecticut Federation of Lakes Inc | Bridgewater | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Connecticut Master Gardener Assoc Inc | Farmington | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Connecticut Orchid Society Inc | Farmington | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Connecticut Outdoor Recreation Alliance | Rockfall | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Connecticut Recyclers Coalition Inc | New Haven | 501(c)(3) | 2012 | $0 | $0 | 2025-06 |
| Connecticut Waterfowl Association Inc | Cheshire | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Conneticut Maritime Foundation Inc | Stonington | 501(c)(3) | 2003 | $7,054 | 2025-12 | |
| Consortium for Sustainable Development Inc | Higganum | 501(c)(3) | 2023 | $0 | $0 | 2023-12 |
| Cove Island Park Conservancy | Stamford | 501(c)(3) | 2011 | $0 | $0 | 2024-12 |
| Cove Island Wildlife Sanctuary | Stamford | 501(c)(3) | 2008 | $0 | $0 | 2024-12 |
| Crew 3000 Inc | Watertown | 501(c)(3) | 2019 | $0 | $0 | 2025-03 |
| Crystal Pond Association Inc | Eastford | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| DS Brown Farm Inc | East Hampton | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Do Good | Farmington | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Dogwood Park Association Inc | Riverside | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Down To Earth Garden Club | South Windsor | 501(c)(3) | 2022 | $0 | $0 | 2026-08 |
| Earth Day Every Day CT Inc | Waterford | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Earth Optimist Club | Stonington | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| East Lyme Public Trust Foundation Inc | Niantic | 501(c)(3) | 1995 | $0 | $0 | 2025-12 |
| Eastern Connecticut Land Bank Inc | Pawcatuck | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Eco Titans Inc | Manchester | 501(c)(3) | 2020 | $0 | $0 | 2025-09 |
| Ecobottle Pickup | Waterbury | 501(c)(3) | 2025 | |||
| Ecotone Systems Incorporated | Hartford | 501(c)(3) | 2026 | |||
| Elis Garden of Healing | Hamden | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Enfield Garden Club | Enfield | 501(c)(3) | 2003 | $0 | $0 | 2026-06 |
| Equitable Earth Charitable Foundation | Norwalk | 501(c)(3) | 2024 | $1 | 2024-12 | |
| Eversource Energy Land Trust Inc | Hartford | 501(c)(3) | 2014 | $11.9 million | 2024-12 | |
| FLS Foundation Inc | East Haven | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Fairfield Bridle Trails Assoc Inc | Westport | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Fairwindct Inc | Colebrook | 501(c)(4) | 2011 | $0 | $0 | 2025-12 |
| Farmington River Anglers Association Inc | New Hartford | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Federated Garden Clubs of CT | Stamford | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Federated Garden Clubs of Connecticut Inc | Southport | 501(c)(3) | 1967 | $0 | $0 | 2026-06 |
| Federated Garden Clubs of Connecticut Inc | Stonington | 501(c)(3) | 1967 | $0 | $0 | 2025-06 |
| Federated Garden Clubs of Connecticut Inc | Washington DT | 501(c)(3) | 1967 | $0 | $0 | 2025-06 |
| Financial Industry Climate Leadership Network LTD | Washington DT | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Flower Again Inc | New Canaan | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Flyway Institute | West Granby | 501(c)(3) | 2026 | |||
| Friends of Bennetts Pond Inc | Ridgefield | 501(c)(3) | 2002 | $0 | $0 | 2025-06 |
| Friends of Bolton Lakes Inc | Manchester | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Friends of Connecticut State Parks Inc | West Hartford | 501(c)(3) | 1996 | $0 | $0 | 2025-12 |
| Friends of Dog Pond Inc | Goshen | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Friends of Great Hill Pond CT Inc | Portland | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Friends of Lake Pocotopaug Inc | East Hampton | 501(c)(3) | 2008 | $0 | $0 | 2025-12 |
| Friends of Lake Williams Inc | Hebron | 501(c)(3) | 1999 | $0 | $0 | 2026-06 |
| Friends of Long Hill Estate Inc | Middletown | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Friends of Manitook Lake | Granby | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Friends of Mono Pond State Park Inc | Columbia | 501(c)(3) | 2022 | $0 | $0 | 2026-06 |
| Friends of North Cove | Old Saybrook | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Outer Island Inc | Branford | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Friends of Pachaug Forest Inc | Griswold | 501(c)(3) | 2018 | $0 | $0 | 2026-06 |
| Friends of Pameacha Pond-Long Hill Brook Inc | Middletown | 501(c)(3) | 2023 | $0 | $0 | 2025-06 |
| Friends of Pope Park Inc | Hartford | 501(c)(3) | 2015 | $0 | $0 | 2023-12 |
| Friends of Rockville Fish & Game Club | Vernon | 501(c)(3) | 2026 | |||
| Friends of Scarritts Mill | West Hartford | 501(c)(3) | 2026 | |||
| Friends of Seaside State Park | New Canaan | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Friends of Sellecks Woods Inc | Darien | 501(c)(3) | 1991 | $0 | $0 | 2025-12 |
| Friends of Sherwood Island State Park | Westport | 501(c)(3) | 1997 | $0 | $0 | 2024-12 |
| Friends of Topsmead State Forest Inc | Litchfield | 501(c)(3) | 2018 | $0 | $0 | 2025-06 |
| Friends of West Side Pond Inc | Goshen | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Friends of the Farm River Estuary Inc | Branford | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Friends of the Hoppers-Birge Pond Nature Preserve Inc | Bristol | 501(c)(3) | 2024 | $28,963 | 2025-12 | |
| Friends of the Oswegatchie Hills Nature Preserve Inc | Niantic | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Friends of the Shetucket River Valley | Baltic | 501(c)(3) | 2013 | $0 | $0 | 2026-06 |
| Fromearth4earth Inc | Middlebury | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Georgetown Lions Club Inc | Redding | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Glastonbury Partners in Planting Inc | S Glastonbury | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Goats for Good | Glastonbury | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Good for Morris Cove Corp | New Haven | 501(c)(3) | 2026 | |||
| Granby Wildflower Meadow | Granby | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Great River Land Trust Inc | East Hartford | 501(c)(3) | 2015 | $0 | $0 | 2025-06 |
| Greater Macs Harbor Improvement Ass Ociation Inc | Stratford | 501(c)(3) | 2026 | |||
| Green Line Albania Inc | Storrs Manfld | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Groton Conservation Advocate Inc | Noank | 501(c)(4) | 2019 | $0 | $0 | 2025-12 |
| Guilford Community Garden Hub Inc | Guilford | 501(c)(3) | 2015 | $0 | $0 | 2024-12 |
| Hamden Homicide Memorial Botanical Garden of Healing | Hamden | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Hartford Audubon Society Inc | West Hartford | 501(c)(3) | 1971 | $0 | $0 | 2024-12 |
| Highland Lake Watershed Association Inc | Winsted | 501(c)(3) | 1996 | $0 | $0 | 2025-12 |
| Hop River Trail Alliance Inc | Bolton | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Housatonic Environmental Action League Inc | Cornwall BRG | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Hunt Hill Farm Trust Inc | New Milford | 501(c)(3) | 2003 | $800,525 | 2024-12 | |
| In the Forest | Old Lyme | 501(c)(3) | 2025 | |||
| Inner Sound Habitats | West Hartford | 501(c)(3) | 2023 | $0 | $0 | 2025-06 |
| Institute of Material Science and Sustainability Co | Weston | 501(c)(3) | 2025 | |||
| Ives Trail and Greenway Regional Association | Danbury | 501(c)(3) | 2016 | $0 | $0 | 2026-07 |
| Jeffersonian Enterprise for Flora and Fauna | Easton | 501(c)(3) | 2024 | $0 | $0 | 2026-03 |
| Kent Garden Club | South Kent | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Lake Beebe Watershed Association LTD | West Hartford | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Lakeville Community Conservancy Inc | Lakeville | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Land Heritage Coalition of Glastonbury Inc | S Glastonbury | 501(c)(3) | 2023 | $0 | $0 | 2026-07 |
| Land Trust of West Haven Inc | West Haven | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Lantern Hill Valley Alliance Inc | Ledyard | 501(c)(3) | 2024 | $0 | $0 | 2025-08 |
| Laurel Garden Club of Beacon Falls | Beacon Falls | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Lesleys Recycling Corp | Stamford | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Litchfield Green Conservancy Inc | Waterbury | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Little Pond Improvement Association | Thompson | 501(c)(3) | 2025 | $0 | $0 | 2026-06 |
| Long Pond Common Land Trust Co | Ledyard | 501(c)(3) | 2014 | $2,686 | 2025-12 | |
| Lower Connecticut River Land Trust Inc | Essex | 501(c)(3) | 1986 | $0 | $0 | 2024-12 |
| Magnaverde Foundation Inc | Greenwich | 501(c)(3) | 1996 | $47,876 | 2025-12 | |
| Manresa Association | Norwalk | 501(c)(3) | 2015 | $0 | $0 | 2026-02 |
| Mansfield Environmental Trust Inc | Storrs Manfld | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| March Against Revenge Porn Inc | Wolcott | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Meriden Land Trust Inc | Meriden | 501(c)(3) | 1992 | $0 | $0 | 2026-03 |
| Meshomasic Hiking Club Inc | Cobalt | 501(c)(3) | 2007 | $0 | $0 | 2026-06 |
| Milford Trees Incorporated | Milford | 501(c)(3) | 2001 | $0 | $0 | 2024-12 |
| Mill River Estuary Foundation Inc | Fairfield | 501(c)(3) | 2026 | |||
| Monroe Land Trust and Tree Conservancy Inc | Monroe | 501(c)(3) | 2014 | $0 | $0 | 2023-04 |
| Moosup Pond Lakefront Association | Moosup | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Morse Wilson Family Foundation | Trumbull | 501(c)(3) | 2022 | $342,579 | 2025-12 | |
| Mother Natures Garden of Killingly Connecticut | Danielson | 501(c)(3) | 2016 | $0 | $3,796 | 2025-06 |
| Mudge Pond Association Inc | Sharon | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Nanoroots Foundation Inc | Guilford | 501(c)(3) | 2026 | |||
| Natural Dividends Inc | West Hartford | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Nature Initiative Inc | Rowayton | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Naugatuck Land Trust Corp | Naugatuck | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Naugatuck River Revival Group | Naugatuck | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| New England Historic Cemetery Restoration Project Inc | Danielson | 501(c)(3) | 2020 | $0 | $0 | 2023-12 |
| New England Native Plant Rescue Inc | Woodstock | 501(c)(3) | 2024 | |||
| New Haven Bonsai Society Inc | New Haven | 501(c)(3) | 2001 | $0 | $0 | 2025-06 |
| New London Trees Inc | New London | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Newtown Earth Day | Newtown | 501(c)(3) | 2017 | $3,115 | 2024-12 | |
| Nexus Regenerative Group Inc | Norwalk | 501(c)(3) | 2026 | |||
| Niantic Watershed Committee Inc | East Lyme | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Nod Road Preservation Inc | Avon | 501(c)(3) | 2018 | $0 | $45 | 2025-12 |
| North Branford Conservation Trust Inc | N Branford | 501(c)(3) | 2012 | $0 | $0 | 2026-05 |
| Northington Meadow | Avon | 501(c)(3) | 2005 | $59,392 | 2026-06 | |
| Northwest Connecticut Sportsmans Land Trust Inc | Harwinton | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Norwalk Tree Alliance Inc | Norwalk | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Nutmeg State Orchid Society | Bristol | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Ocean Connect Inc | Wilton | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Old Saybrook Coastal Resilience Coalition Inc | Old Saybrook | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Old Stone Mill Foundation Trust | Colchester | 501(c)(3) | 2017 | $3.2 million | 2024-12 | |
| On the Salt Co | Deep River | 501(c)(3) | 2024 | $0 | $0 | 2025-03 |
| Oxford Main Street Project Corporation | Oxford | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Pachaug Pond Weed Control Association Inc | Jewett City | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Park City Conservancy Inc | Bridgeport | 501(c)(3) | 2026 | |||
| Park Watershed Inc | Hartford | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Pattagansett Lake Association | East Lyme | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Pemberwick Glenville Association Inc | Greenwich | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Pequabuck River Watershed Assoc | Bristol | 501(c)(3) | 1997 | $0 | $0 | 2025-08 |
| Peters Rock Association Inc | North Haven | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Planet New Canaan Inc | New Canaan | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Planned Development Alliance of Northwest Connecticut Inc | Salisbury | 501(c)(3) | 2006 | $0 | $0 | 2023-12 |
| Plantin Seeds Inc | Falls Village | 501(c)(3) | 2017 | $0 | $0 | 2025-09 |
| Plugwell | Ridgefield | 501(c)(3) | 2024 | $0 | $0 | 2024-08 |
| Pollinator Pathway East Lyme | East Lyme | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Pond Mountain Trust Inc | Kent | 501(c)(3) | 1967 | $2.4 million | 2025-12 | |
| Pootatuck Watershed Asscoaition Inc | Newtown | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Prospect Land Trust Inc | Prospect | 501(c)(3) | 1995 | $0 | $0 | 2025-12 |
| Protect Our Pollinators | Newtown | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Rainbow Recycling Inc | New Haven | 501(c)(3) | 1991 | $0 | $0 | 2022-12 |
| Recyclect Foundation Inc | Hartford | 501(c)(3) | 2017 | $0 | $0 | 2025-06 |
| Red Wing Foundation Inc | Clinton | 501(c)(3) | 2012 | $0 | $0 | 2025-08 |
| Ridgefield Open Space Association Inc | Ridgefield | 501(c)(4) | 1999 | $0 | $0 | 2025-06 |
| Ring One Boxing Inc | Orange | 501(c)(3) | 1997 | $0 | $0 | 2024-12 |
| River Advocates of South Central Connecticut Inc | Wallingford | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Riverquest Inc | Haddam | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Rubicon Seven Foundation | Ridgefield | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Saugatuck Safe Harbor Foundation | Westport | 501(c)(3) | 2026 | |||
| Save Our Stepney Task Force Incorporated | Monroe | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Save the Choc Corporation | Riverside | 501(c)(3) | 2025 | $0 | $0 | 2026-01 |
| Scantic River Watershed Association Inc | Somers | 501(c)(3) | 2004 | $0 | $0 | 2025-07 |
| Schumas Path Inc | Bristol | 501(c)(3) | 2026 | |||
| Seymour Land Conservation Trust Inc | Seymour | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Sharon Green Preservation Association Inc | Sharon | 501(c)(3) | 1995 | $0 | $0 | 2025-12 |
| Shelton Clean-Up Project | Shelton | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Shepaug River Association Inc | New Preston | 501(c)(3) | 1998 | $0 | $0 | 2024-12 |
| Shoreride Inc | Deep River | 501(c)(3) | 2025 | $0 | $0 | 2024-12 |
| Simsbury Pollinator Pathway Inc | Simsbury | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Solar Security Net Inc | Andover | 501(c)(3) | 2024 | |||
| Somers Beautification | Somers | 501(c)(3) | 2022 | $11,382 | 2025-12 | |
| Sonic Haven | New Haven | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Sovereign Land Trust Inc | Bridgeport | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Susan Elaine Foundation Inc | Old Saybrook | 501(c)(3) | 2021 | $1.1 million | 2025-12 | |
| Sustain Music and Nature Inc | Colchester | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Sustainable Learning Inc | Roxbury | 501(c)(3) | 2013 | $0 | $39,702 | 2025-09 |
| Sustainable Westport Inc | Westport | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Tamoray Land Trust | Sharon | 501(c)(3) | 2000 | $177,700 | 2025-12 | |
| Thames River Innovation Places Inc | Groton | 501(c)(3) | 2019 | $0 | $0 | 2024-06 |
| The Crystal Lake Association Inc | Ellington | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| The Drinking Water Project Corporation | Quaker Hill | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| The Lake Basile Association | Granby | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| The Sea Life Foundation Inc | Stonington | 501(c)(3) | 2026 | $0 | $0 | 2026-03 |
| The@ocean View Foundation Inc | Cos Cob | 501(c)(3) | 1999 | $4 million | 2026-01 | |
| Three Tiers for Connecticut Inc | Norwalk | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| Tidewater Institute | Old Saybrook | 501(c)(3) | 2007 | $0 | $0 | 2025-06 |
| Tightlined Conservation Coalition Inc | Lyme | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Tributary Mill Conservancy | Old Lyme | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Tucker Memorial Fund | Fairfield | 501(c)(3) | 2023 | $0 | $0 | 2025-09 |
| Village Creek Coastal Management Co Rporation | Norwalk | 501(c)(3) | 2025 | |||
| Voda Foundation | Greenwich | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Wallingford Land Trust Inc the | Wallingford | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Washington Environmental Council Inc | Washington | 501(c)(3) | 1975 | $0 | $0 | 2025-09 |
| Waste Free Greenwich Inc | Old Greenwich | 501(c)(3) | 2023 | $0 | $0 | 2025-06 |
| Water Innovations Alliance Foundation | Fairfield | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Waterbury Environmental Health Fund | Waterbury | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Waterford Land Trust Inc | Waterford | 501(c)(3) | 1974 | $0 | $0 | 2025-06 |
| Webb Mountain Discovery Zone Incorporated | Monroe | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Wernickes Foundation of America Inc | Greenwich | 501(c)(3) | 2019 | $0 | $0 | 2023-12 |
| West Beach Association | Westbrook | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| West Hartford Tree Project | West Hartford | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| West Rock Ridge Park Association Inc | Hamden | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| West Woodstock Library Association | Woodstock | 501(c)(3) | 2013 | $0 | $0 | 2025-06 |
| Weston Garden Club Inc | Weston | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Westport Evergreen Inc | Westport | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Wharton Neighbors | Woodbridge | 501(c)(3) | 2026 | |||
| Wild Lake Association Inc | Meriden | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Wildlands Stewardship Foundation | Central Village | 501(c)(3) | 2026 | |||
| Wildshare Inc | Georgetown | 501(c)(3) | 1998 | $23,885 | 2024-12 | |
| Willimantic River Alliance Inc | Bolton | 501(c)(3) | 2005 | $0 | $0 | 2024-12 |
| Windows-On-Our-Waters | Mystic | 501(c)(3) | 2001 | |||
| Windsor Land Trust Inc | Windsor | 501(c)(3) | 2003 | $0 | $0 | 2024-12 |
| Woodland Heights Open Space Association Inc | Southington | 501(c)(4) | 2022 | $0 | $0 | 2025-12 |
| Wyassup Lake Improvement Association Inc | N Stonington | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Yale Blue Green Inc | Fairfield | 501(c)(3) | 2025 | $0 | $0 | 2026-04 |
Every nonprofit in Connecticut
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.