Environment nonprofits in Connecticut

Environment nonprofits in Connecticut. Browse 566 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

  1. 10000 Hawks Inc

    EIN 931498175 · Headquarters: New Haven, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  2. 36 Tower Lane Inc

    EIN 392506114 · Headquarters: New Haven, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  3. 4 Conservation Charitable Foundation

    EIN 993849804 · Headquarters: New London, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  4. Air Conservation Trust Inc

    EIN 061042992 · Headquarters: Greenwich, CT, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  5. Alewife Cove Conservancy

    EIN 820834289 · Headquarters: New London, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  6. Alliance for the Mystic River Watershed

    EIN 883766501 · Headquarters: MYSTIC, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  7. American Wanderer Foundation

    EIN 262807643 · Headquarters: Weston, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  8. Amos Lake Association

    EIN 204081517 · Headquarters: Preston, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  9. Art for a Cause Pollinator Garden

    EIN 991256684 · Headquarters: Southington, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  10. Ash Creek Conservation Assoc Inc

    EIN 320075215 · Headquarters: Bridgeport, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  11. Aspetuck Land Trust

    EIN 066088827 · Headquarters: Westport, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  12. Aton Forest Inc

    EIN 061288452 · Headquarters: NORFOLK, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  13. Avalonia Land Conservancy Inc

    EIN 066103893 · Headquarters: OLD MYSTIC, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. Avon Land Trust Inc

    EIN 060897842 · Headquarters: Avon, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  15. Azdaks Garden Inc

    EIN 061357912 · Headquarters: New Haven, CT, US · Environment · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  16. Bantam Lake Protective Association Incorporated

    EIN 061312754 · Headquarters: Bantam, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  17. Bantam River Watershed Association Inc

    EIN 510457348 · Headquarters: Washington Depot, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  18. Bartlett Arboretum Association Inc

    EIN 066079591 · Headquarters: STAMFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  19. Bashan Lake Association

    EIN 061339061 · Headquarters: East Haddam, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  20. Bayside Beach Association Inc

    EIN 222533480 · Headquarters: Waterford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  21. Berlin Land Trust Inc

    EIN 222889950 · Headquarters: BERLIN, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  22. Bethany Community Garden Inc

    EIN 811743662 · Headquarters: Bethany, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  23. Bethany Land Trust Inc C/o Peter Simon Treasurer

    EIN 066105317 · Headquarters: BETHANY, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  24. Better Planet Fund Inc

    EIN 334319612 · Headquarters: WILTON, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  25. Beverage Container Stewardship Connecticut Inc

    EIN 883048330 · Headquarters: West Hartford, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  26. Bird Conservation Research Inc

    EIN 061525730 · Headquarters: East Haddam, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  27. Blackberry River Valley Protection Alliance Inc

    EIN 872604052 · Headquarters: East Canaan, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Blau House & Gardens Inc

    EIN 880753928 · Headquarters: Westport, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  29. Blueoceanz Inc

    EIN 923004791 · Headquarters: New Canaan, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  30. Bolton Land Trust Inc

    EIN 061615351 · Headquarters: BOLTON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  31. Brandegee Lake Association Co

    EIN 332406195 · Headquarters: waterford, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  32. Branford Land Trust Inc

    EIN 066107860 · Headquarters: BRANFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  33. Branford River Raptor Center Inc

    EIN 061507501 · Headquarters: Branford, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  34. Brass Center Limited

    EIN 061384466 · Headquarters: WATERBURY, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  35. Bridgeport Community Land Trust

    EIN 205413867 · Headquarters: Bridgeport, CT, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  36. Bridgewater Land Trust

    EIN 061212623 · Headquarters: Bridgewater, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  37. Bridle Path Conservancy Inc

    EIN 201894760 · Headquarters: Westbrook, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  38. Buildgreenct Inc

    EIN 061636430 · Headquarters: NEW HAVEN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  39. Burleson Institute Inc

    EIN 800940439 · Headquarters: Cos Cob, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  40. Calf Island Conservancy Inc

    EIN 010809168 · Headquarters: Westbrook, CT, US · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  41. Cans-4-A-Cause of Greater Middletown

    EIN 863459602 · Headquarters: Middletown, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  42. Canton Land Conservation Trust Inc

    EIN 237187569 · Headquarters: CANTON CENTER, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  43. Caprilands Institute Inc

    EIN 263925974 · Headquarters: Coventry, CT, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  44. Caretakers of Soapstone Mountain In

    EIN 814358393 · Headquarters: SOMERS, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  45. Center for Coastal Preservation Inc

    EIN 273597258 · Headquarters: Wilton, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  46. Charles Island Reforestation Llc

    EIN 870872875 · Headquarters: WALLINGFORD, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  47. Chatham Rock Island Inc

    EIN 921044248 · Headquarters: STAMFORD, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  48. Chelsea Gardens Foundation Inc

    EIN 061377136 · Headquarters: NORWICH, CT, USA · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990

  49. Cheshire Pollinator Pathway Inc

    EIN 932281335 · Headquarters: CHESHIRE, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Chester Land Trust

    EIN 061275067 · Headquarters: Chester, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Citizens for Bransford Environment Inc

    EIN 061563757 · Headquarters: Branford, CT, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  52. Citizens for Clean Groundwater Inc

    EIN 264436547 · Headquarters: OLD LYME, CT, US · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  53. Citizens for Easton

    EIN 060989528 · Headquarters: Easton, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. Citizens for Public Commons Inc

    EIN 812601509 · Headquarters: Sandy Hook, CT, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  55. Clean Energy Clean Environment

    EIN 050611702 · Headquarters: New Hartford, CT, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  56. Cleanpeace Inc

    EIN 300326233 · Headquarters: Bridgeport, CT, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  57. Clinton Arbor Garden Club

    EIN 066080244 · Headquarters: Clinton, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  58. Closed Loop Initiative Partners

    EIN 812935199 · Headquarters: Stamford, CT, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  59. Coalition for Sound Growth of Norfolk Inc

    EIN 113696037 · Headquarters: NORFOLK, CT, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  60. Coastal Environmental Services Inc

    EIN 412257085 · Headquarters: Mystic, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  61. Coeea Fund Inc

    EIN 271497607 · Headquarters: West Hartford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  62. Colchester Land Trust Inc

    EIN 810622538 · Headquarters: COLCHESTER, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  63. Colebrook Land Conservancy Inc

    EIN 061165984 · Headquarters: COLEBROOK, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  64. Collective Oyster Recycling & Restoration Foundation

    EIN 921890360 · Headquarters: FAIRFIELD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  65. Committee to Save Guilford Shoreline Inc

    EIN 311623698 · Headquarters: Guilford, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  66. Community Voice Channel

    EIN 061313156 · Headquarters: Bolton, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  67. Concerned Citizens for the Preservation of Watertown Inc

    EIN 061277084 · Headquarters: oakville, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  68. Congamond Lakes Enviromental Protection Organization

    EIN 471174091 · Headquarters: West Suffield, CT, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  69. Connecticut Agricultural Experiment Station Research Foundation Inc

    EIN 260367921 · Headquarters: New Haven, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  70. Connecticut Association of Conservation & Inland Wetlands

    EIN 223209645 · Headquarters: MIDDLETOWN, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  71. Connecticut Audubon Society Inc

    EIN 060653531 · Headquarters: FAIRFIELD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  72. Connecticut Botanical Society Inc

    EIN 066051998 · Headquarters: Kensington, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  73. Connecticut Brownfield Land Bank

    EIN 463377961 · Headquarters: Essex, CT, US · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  74. Connecticut Business Environmental Council Inc

    EIN 061388970 · Headquarters: Bristol, CT, US · Environment · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  75. Connecticut Butterfly Association Inc

    EIN 223345360 · Headquarters: Wallingford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  76. Connecticut Chapter of ACHMM Inc

    EIN 300432691 · Headquarters: Plainville, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  77. Connecticut Chapter of the Air and Wast Management Association

    EIN 061369613 · Headquarters: Middletown, CT, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  78. Connecticut Citizen Research Group Inc

    EIN 060889894 · Headquarters: HARTFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  79. Connecticut Clean Communities Advisory Inc

    EIN 934746851 · Headquarters: Woodbury, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  80. Connecticut Clean Waterways Project Inc

    EIN 880714938 · Headquarters: old saybrook, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  81. Connecticut Coalition for Environmental Justice Inc

    EIN 061511861 · Headquarters: HARTFORD, CT, USA · Environment · Latest available filing year: 2015 · Primary form: IRS Form 990

  82. Connecticut Community Gardening Association

    EIN 680603309 · Headquarters: New Haven, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  83. Connecticut Conservation Associatio

    EIN 060880962 · Headquarters: Bridgeport, CT, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  84. Connecticut Earth Network Inc

    EIN 331148129 · Headquarters: Georgetown, CT, US · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  85. Connecticut Federation of Lakes Inc

    EIN 061442427 · Headquarters: Bridgewater, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  86. Connecticut Fuel Oil Conservation Fund Inc

    EIN 450592873 · Headquarters: LITCHFIELD, CT, US · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  87. Connecticut Ground Water Association Inc

    EIN 223043350 · Headquarters: New London, CT, US · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  88. Connecticut Land Conservation Council Inc

    EIN 822683386 · Headquarters: Middletown, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  89. Connecticut Maritime Foundation in Inc

    EIN 383679300 · Headquarters: STONINGTON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  90. Connecticut Master Gardener Assoc Inc

    EIN 061221782 · Headquarters: Farmington, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  91. Connecticut Orchid Society Inc

    EIN 050634357 · Headquarters: Farmington, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  92. Connecticut Outdoor Recreation Alliance

    EIN 871497818 · Headquarters: Rockfall, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. Connecticut Recyclers Coalition Inc

    EIN 223086715 · Headquarters: New Haven, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  94. Connecticut Resource Conservation & Dev Area Inc

    EIN 060976326 · Headquarters: HADDAM, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  95. Connecticut River Coastal Conservation District Inc

    EIN 060733567 · Headquarters: MIDDLETOWN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  96. Connecticut Roundtable on Climate and Jobs

    EIN 824185276 · Headquarters: Clinton, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  97. Connecticut Sustainable Business Council Inc

    EIN 813372785 · Headquarters: Bethel, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  98. Connecticut Waterfowl Association Inc

    EIN 066099895 · Headquarters: Cheshire, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  99. Connecticut Wind Collaborative Inc

    EIN 934487800 · Headquarters: GROTON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  100. Conneticut Valley Garden Club

    EIN 066040380 · Headquarters: Simsbury, CT, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N

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