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. Conscious Inc

    EIN 842813582 · Headquarters: HARTFORD, CT, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  2. Conserving Tolland Inc

    EIN 061829646 · Headquarters: tolland, CT, US · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  3. Consortium for Sustainable Development Inc

    EIN 921582656 · Headquarters: Higganum, CT, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  4. Cool Thinking Inc

    EIN 260570001 · Headquarters: Rowayton, CT, US · Environment · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  5. Cove Island Park Conservancy

    EIN 274156544 · Headquarters: Stamford, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  6. Cove Island Wildlife Sanctuary

    EIN 161772159 · Headquarters: Stamford, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  7. Coventry Garden Club

    EIN 066059442 · Headquarters: Coventry, CT, US · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  8. Crew 3000 Inc

    EIN 364906051 · Headquarters: Watertown, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  9. Crystal Pond Association Inc

    EIN 061254986 · Headquarters: Eastford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  10. Ct Energy Efficiency Financing Company C/o Capital for Change Inc

    EIN 452412035 · Headquarters: WALLINGFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  11. Ct Feral Cats Metal for Meals Inc

    EIN 830765694 · Headquarters: manchester, CT, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  12. Ct Tree Protective Association Inc

    EIN 060990196 · Headquarters: WALLINGFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  13. Darien Nature Center Inc

    EIN 061051768 · Headquarters: DARIEN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. Denison Pequotsepos Nature Center

    EIN 060884024 · Headquarters: MYSTIC, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  15. Do Good Incorporaiton

    EIN 994606476 · Headquarters: FARMINGTON, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  16. Dogwood Park Association Inc

    EIN 061184802 · Headquarters: Riverside, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  17. Down to Earth Garden Club

    EIN 882910169 · Headquarters: South Windsor, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  18. Drop of Life Corporation

    EIN 843404938 · Headquarters: Southbury, Connecticut, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  19. Ds Brown Farm Inc

    EIN 392389907 · Headquarters: East Hampton, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  20. Earth Day Every Day Ct Inc

    EIN 844355735 · Headquarters: Waterford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  21. Earth Optimist Club

    EIN 932137247 · Headquarters: Stonington, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  22. Earthplace Inc

    EIN 060740523 · Headquarters: WESTPORT, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  23. Earthwise Living Foundation

    EIN 260378910 · Headquarters: Fairfield, CT, US · Environment · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  24. East Haddam Land Trust Inc

    EIN 061006484 · Headquarters: EAST HADDAM, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  25. East Lyme Land Trust Inc

    EIN 237169068 · Headquarters: East Lyme, CT, USA · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990

  26. East Lyme Public Trust Foundation Inc

    EIN 061430188 · Headquarters: Niantic, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  27. East River Watershed Research Institute

    EIN 873800202 · Headquarters: ORANGE, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  28. East Shore Neighborhood Preservation Assoc Inc

    EIN 223106699 · Headquarters: New Haven, CT, US · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  29. Eastern Connecticut Green Action

    EIN 832396528 · Headquarters: Storrs, CT, US · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  30. Eastern Connecticut Land Bank Inc

    EIN 843728285 · Headquarters: CENTRAL VILLAGE, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  31. Eco Titans Inc

    EIN 845122410 · Headquarters: Manchester, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  32. Ecoworks Inc

    EIN 463567282 · Headquarters: North Haven, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  33. Edgerton Park Conservancy Inc

    EIN 060881839 · Headquarters: HAMDEN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  34. Efficiency for All

    EIN 821102651 · Headquarters: WINDSOR, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  35. Elis Garden of Healing

    EIN 882835491 · Headquarters: Hamden, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  36. Enfield Energy Alliance Inc

    EIN 463441729 · Headquarters: MIDDLETOWN, CT, USA · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-PF

  37. Enfield Garden Club

    EIN 820541346 · Headquarters: Enfield, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  38. Environment Connecticut Research & Policy Center Inc

    EIN 331151595 · Headquarters: WEST HARTFORD, CT, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  39. Environmental Council of Stamford Inc

    EIN 237063527 · Headquarters: Stamford, CT, US · Environment · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  40. Environmental Health Institute of Connecticut Inc

    EIN 872461558 · Headquarters: ELLINGTON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  41. Environmental Learning Centers of Connecticut Inc

    EIN 237094283 · Headquarters: BRISTOL, CT, USA · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990

  42. Equitable Earth Charitable Foundation

    EIN 331848684 · Headquarters: Norwalk, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  43. Essex Land Trust Inc

    EIN 066104076 · Headquarters: ESSEX, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  44. Eversource Energy Land Trust Inc

    EIN 461387121 · Headquarters: HARTFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  45. Everyone Outside

    EIN 474740244 · Headquarters: Durham, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  46. Expedition Earth Productions Inc

    EIN 271812865 · Headquarters: Madison, CT, US · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  47. Fairfield Bridle Trails Assoc Inc

    EIN 066087490 · Headquarters: Westport, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. Fairwindct Inc

    EIN 274238311 · Headquarters: COLEBROOK, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. Farmcreek Org Inc

    EIN 141913015 · Headquarters: Norwalk, CT, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  50. Farmington Land Trust

    EIN 237107644 · Headquarters: Unionville, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  51. Farmington River Anglers Association Inc

    EIN 300093975 · Headquarters: New Hartford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  52. Farmington River Watershed Association

    EIN 060741585 · Headquarters: Simsbury, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  53. Federated Garden Club of Connecticut Inc

    EIN 066084091 · Headquarters: GREENWICH, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  54. Federated Garden Clubs of Connecticut Inc

    EIN 061027335 · Headquarters: Seymour, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  55. Federated Garden Clubs of Connecticut Inc

    EIN 061073370 · Headquarters: Middlebury, CT, US · Environment · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  56. Federated Garden Clubs of Connecticut Inc

    EIN 061292779 · Headquarters: W Granby, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  57. Federated Garden Clubs of Connecticut Inc

    EIN 061386019 · Headquarters: Weston, CT, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  58. Federated Garden Clubs of Connecticut Inc

    EIN 061541866 · Headquarters: Washington Depot, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  59. Federated Garden Clubs of Connecticut Inc

    EIN 066040512 · Headquarters: Wethersfield, CT, US · Environment · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  60. Federated Garden Clubs of Connecticut Inc

    EIN 066057606 · Headquarters: Rocky Hill, CT, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  61. Federated Garden Clubs of Connecticut Inc

    EIN 066058977 · Headquarters: Wethersfield, CT, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  62. Federated Garden Clubs of Connecticut Inc

    EIN 066077633 · Headquarters: South Glastonbury, CT, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  63. Federated Garden Clubs of Connecticut Inc

    EIN 066080228 · Headquarters: WESTON, CT, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  64. Federated Garden Clubs of Connecticut Inc

    EIN 066080328 · Headquarters: W Hartford, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  65. Federated Garden Clubs of Connecticut Inc

    EIN 066080377 · Headquarters: Stonington, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  66. Federated Garden Clubs of Connecticut Inc

    EIN 066080618 · Headquarters: Durham, CT, US · Environment · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  67. Federated Garden Clubs of Connecticut Inc

    EIN 066080755 · Headquarters: Stamford, CT, US · Environment · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  68. Federated Garden Clubs of Connecticut Inc

    EIN 066081121 · Headquarters: West Hartford, CT, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  69. Federated Garden Clubs of Connecticut Inc

    EIN 066081235 · Headquarters: Kensington, CT, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  70. Federated Garden Clubs of Connecticut Inc

    EIN 066081632 · Headquarters: Wethersfield, CT, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  71. Federated Garden Clubs of Connecticut Inc

    EIN 066081707 · Headquarters: East Hartford, CT, US · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  72. Federated Garden Clubs of Connecticut Inc

    EIN 066081779 · Headquarters: Glastonbury, CT, US · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  73. Federated Garden Clubs of Connecticut Inc

    EIN 066084076 · Headquarters: Portland, CT, US · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  74. Federated Garden Clubs of Connecticut Inc

    EIN 066084080 · Headquarters: South Glastonbury, CT, US · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  75. Federated Garden Clubs of Connecticut Inc

    EIN 066084096 · Headquarters: Easton, CT, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  76. Federated Garden Clubs of Connecticut Inc

    EIN 066084122 · Headquarters: Farmington, CT, US · Environment · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  77. Federated Garden Clubs of Connecticut Inc

    EIN 223284636 · Headquarters: Southport, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  78. Federated Garden Clubs of Connecticut Inc

    EIN 237300550 · Headquarters: West Hartford, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  79. Federated Garden Clubs of Connecticut Inc

    EIN 510191120 · Headquarters: glastonbury, CT, US · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  80. Federated Garden Clubs of Connecticut Inc

    EIN 562439366 · Headquarters: Sherman, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  81. Federated Garden Clubs of Connecticut Inc

    EIN 850691321 · Headquarters: East Hartford, CT, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  82. Federated Garden Clubs of Connecticut Inc

    EIN 912015044 · Headquarters: Woodstock, CT, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  83. Federated Garden Clubs of Connecticut Inc Dba Essex Garden Club Inc

    EIN 066055281 · Headquarters: ESSEX, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  84. Federated Garden Clubs of Ct

    EIN 066055473 · Headquarters: Stamford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. Federated Garden Clubs of Ct Inc

    EIN 066060890 · Headquarters: WALLINGFORD, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  86. Fin and Feather Nature Conservancy Inc

    EIN 473195634 · Headquarters: FAIRFIELD, CT, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  87. Financial Industry Climate Leadership Network Ltd

    EIN 872756845 · Headquarters: Washington Depot, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  88. Flanders Nature Center & Land Trust Inc

    EIN 060791823 · Headquarters: Woodbury, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  89. Flower Again Inc

    EIN 880924608 · Headquarters: New Canaan, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. Fls Foundation Inc

    EIN 881729179 · Headquarters: East Haven, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  91. Foundation for Regional Water Resource Development Inc

    EIN 261798345 · Headquarters: Fairfield, CT, US · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  92. Friends of Ansonia Nature Center Inc

    EIN 061339876 · Headquarters: ANSONIA, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  93. Friends of Bennetts Pond Inc

    EIN 364509042 · Headquarters: Ridgefield, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  94. Friends of Bolton Lakes Inc

    EIN 320399479 · Headquarters: MANCHESTER, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  95. Friends of Connecticut State Parks Inc

    EIN 061424189 · Headquarters: West Hartford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  96. Friends of Dog Pond Inc

    EIN 881074635 · Headquarters: Goshen, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  97. Friends of Gillette Castle State Park Inc

    EIN 300060245 · Headquarters: East Haddam, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  98. Friends of Goodwives River Inc

    EIN 061437112 · Headquarters: Darien, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  99. Friends of Great Hill Pond Ct Inc

    EIN 933663902 · Headquarters: Portland, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  100. Friends of Hammonasset Inc

    EIN 061546997 · Headquarters: MADISON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

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