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. Pattagansett Lake Association

    EIN 061538383 · Headquarters: East Lyme, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  2. Pemberwick Glenville Association Inc

    EIN 364647509 · Headquarters: Greenwich, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  3. Pequabuck River Watershed Assoc

    EIN 061415986 · Headquarters: Bristol, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  4. Peters Rock Association Inc

    EIN 202262231 · Headquarters: North Haven, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  5. Pick-up Planet Earth

    EIN 882344633 · Headquarters: Newington, CT, US · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  6. Planet New Canaan Inc

    EIN 861394396 · Headquarters: New Canaan, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  7. Planned Development Alliance of Northwest Connecticut Inc

    EIN 203541203 · Headquarters: Salisbury, CT, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  8. Plantin Seeds Inc

    EIN 814307765 · Headquarters: FALLS VILLAGE, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  9. Pleasant Valley Association

    EIN 134234549 · Headquarters: LYME, CT, USA · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-EZ

  10. Plugwell

    EIN 994233805 · Headquarters: Ridgefield, CT, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  11. Pollinator Pathway East Lyme

    EIN 852779240 · Headquarters: EAST LYME, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  12. Pollinator Pathway Inc

    EIN 872704374 · Headquarters: Wilton, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  13. Pond Mountain Trust Inc

    EIN 066088679 · Headquarters: KENT, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  14. Pootatuck Watershed Asscoaition Inc

    EIN 204884669 · Headquarters: Newtown, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  15. Ports of Cause Inc

    EIN 463930494 · Headquarters: WESTON, CT, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  16. Pratt Nature Center Inc

    EIN 060873675 · Headquarters: NEW MILFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  17. Professional Gardeners Guild

    EIN 020553277 · Headquarters: Cornwall Bridge, CT, US · Environment · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  18. Prospect Land Trust Inc

    EIN 114349128 · Headquarters: Prospect, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  19. Protect Our Pollinators

    EIN 833051531 · Headquarters: NEWTOWN, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  20. Protect Your Environment Pye of Stratford Conn Inc

    EIN 237089972 · Headquarters: Stratford, CT, US · Environment · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  21. Quinnipiac River Watershed Association

    EIN 061052011 · Headquarters: MERIDEN, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  22. Race Against Time Inc

    EIN 884318647 · Headquarters: Hartford, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  23. Rainbow Recycling Inc

    EIN 061289760 · Headquarters: NEW HAVEN, CT, US · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  24. Real Estate Agents Recycle Inc

    EIN 813016854 · Headquarters: WEST HARTFORD, CT, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  25. Recyclect Foundation Inc

    EIN 474182172 · Headquarters: HARTFORD, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  26. Recycling for Rhode Island Education

    EIN 061478787 · Headquarters: NEW LONDON, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  27. Red Wing Foundation Inc

    EIN 061560027 · Headquarters: Clinton, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Redding Land Trust Inc

    EIN 066080949 · Headquarters: Redding, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  29. Reforest the Tropics Incorporated

    EIN 061449475 · Headquarters: MYSTIC, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  30. Remarkable Steam Inc

    EIN 461803605 · Headquarters: Westport, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  31. Renew Northeast Inc

    EIN 300557554 · Headquarters: MADISON, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  32. Residents Advocationg Conservation Inc

    EIN 223027756 · Headquarters: MARLBOROUGH, CT, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  33. Ridgefield Open Space Association Inc

    EIN 061536217 · Headquarters: Ridgefield, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  34. Ring One Boxing Inc

    EIN 061443363 · Headquarters: ORANGE, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  35. River Advocates of South Central Connecticut Inc

    EIN 810914639 · Headquarters: Wallingford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  36. Riverquest Inc

    EIN 471549226 · Headquarters: Haddam, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  37. Rivers Alliance of Connecticut Inc

    EIN 061361719 · Headquarters: LITCHFIELD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  38. Rockwell Street Gardens Inc

    EIN 270165396 · Headquarters: Norwich, CT, USA · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  39. Roxbury Land Trust

    EIN 237098549 · Headquarters: Roxbury, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  40. Rubicon Seven Foundation

    EIN 263453469 · Headquarters: Ridgefield, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  41. Salem Land Trust Inc

    EIN 061476028 · Headquarters: Salem, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  42. Salisbury-lakeville Beautification Committee

    EIN 465759651 · Headquarters: Salisbury, CT, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  43. Salmon Brook Watershed Association Inc

    EIN 743050443 · Headquarters: Granby, CT, US · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  44. Sasco Creek Neighbors Environmental Trust Inc

    EIN 932996480 · Headquarters: SOUTHPORT, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  45. Saugatuck Land Trust Co

    EIN 061497788 · Headquarters: NORWALK, CT, USA · Environment · Latest available filing year: 2014 · Primary form: IRS Form 990-PF

  46. Save Darien Wetlands

    EIN 061607952 · Headquarters: Newtown, CT, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  47. Save New Canaan Inc

    EIN 882241989 · Headquarters: NEW CANAAN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  48. Save Ocean Beach Inc

    EIN 061559090 · Headquarters: NEW LONDON, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  49. Save Our Stepney Task Force Incorporated

    EIN 571150710 · Headquarters: MONROE, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Save the Choc Corporation

    EIN 993172676 · Headquarters: RIVERSIDE, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Save the River - Save the Hills Inc

    EIN 061613767 · Headquarters: WATERFORD, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  52. Save the Sound

    EIN 060990195 · Headquarters: NEW HAVEN, CT, USA · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990

  53. Scantic River Watershed Association Inc

    EIN 562304289 · Headquarters: Somers, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  54. Sea Life Foundation Inc

    EIN 394778416 · Headquarters: STONINGTON, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  55. Seymour Land Conservation Trust Inc

    EIN 222753617 · Headquarters: seymour, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  56. Sharon Green Preservation Association Inc

    EIN 223382426 · Headquarters: Sharon, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  57. Sharon Land Trust Inc

    EIN 061069118 · Headquarters: SHARON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  58. Shelton Clean-up Project

    EIN 874401842 · Headquarters: Shelton, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  59. Shepaug River Association Inc

    EIN 061499394 · Headquarters: New Preston, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  60. Shoreride Inc

    EIN 394302817 · Headquarters: Deep River, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  61. Simsbury Horticultural Society

    EIN 843585743 · Headquarters: Simsbury, CT, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  62. Simsbury Land Trust Inc

    EIN 060958573 · Headquarters: SIMSBURY, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  63. Simsbury Pollinator Pathway Inc

    EIN 863147889 · Headquarters: Simsbury, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. Sister's Journey Inc

    EIN 200664996 · Headquarters: North Haven, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  65. Society for the Archeological Study of the Mary Rose Inc

    EIN 061043551 · Headquarters: Greenwich, CT, US · Environment · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  66. Society of Women Environmental Professionals

    EIN 550829998 · Headquarters: Southbury, CT, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  67. Solerico Foundation Inc

    EIN 825475193 · Headquarters: Westport, CT, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  68. Somers Beautification

    EIN 873054539 · Headquarters: Somers, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  69. Soundkeeper Inc C/o Save the Sound

    EIN 061224565 · Headquarters: NEW HAVEN, CT, USA · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990

  70. Soundwaters Inc

    EIN 061263947 · Headquarters: STAMFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  71. Southbury Land Trust Inc

    EIN 060977326 · Headquarters: SOUTHBURY, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  72. Southwest Conservation District Inc

    EIN 060918194 · Headquarters: Hamden, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  73. Sovereign Land Trust Inc

    EIN 992746493 · Headquarters: Bridgeport, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  74. Stamford Garden Club

    EIN 550895904 · Headquarters: Stamford, CT, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  75. Stamford Land Conservation Trust Inc

    EIN 237169603 · Headquarters: Stamford, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  76. Steep Rock Association Inc

    EIN 066069060 · Headquarters: WASHINGTON DEPOT, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  77. Stonington Land Trust Inc

    EIN 412228108 · Headquarters: STONINGTON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  78. Stony Hill Preserve Inc

    EIN 820657642 · Headquarters: HAWLEYVILLE, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  79. Suffield Land Conservancy Inc

    EIN 061031536 · Headquarters: SUFFIELD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  80. Sustain Music and Nature Inc

    EIN 474722702 · Headquarters: Colchester, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  81. Sustainable Westport Inc

    EIN 922390110 · Headquarters: Westport, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  82. Swan Society Inc

    EIN 061453693 · Headquarters: Shelton, CT, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  83. T I P of Connecticut Inc

    EIN 061326266 · Headquarters: West Hartford, CT, US · Environment · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  84. Tamoray Land Trust

    EIN 316652125 · Headquarters: SHARON, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  85. Thames River Innovation Places Inc

    EIN 830544046 · Headquarters: GROTON, CT, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  86. The Celine Cousteau Film Fellowship Inc

    EIN 273264552 · Headquarters: SHERMAN, CT, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  87. The Claire C Bennitt Watershed Fund Inc

    EIN 061534484 · Headquarters: NEW HAVEN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  88. The Connecticut Horticultural Society Inc

    EIN 066048899 · Headquarters: WEST HARTFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  89. The Crystal Lake Association Inc

    EIN 061363644 · Headquarters: Ellington, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. The Drinking Water Project Corporation

    EIN 883331128 · Headquarters: Quaker Hill, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  91. THE FAIRFIELD GARDEN CLUBINC AttnTreasurer

    EIN 066047747 · Headquarters: SOUTHPORT, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  92. The Global Preservation Soci Inc

    EIN 832631077 · Headquarters: WESTON, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  93. The Greenwich Land Trust Inc

    EIN 060950851 · Headquarters: GREENWICH, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  94. The Greenwich Tree Conservancy Inc

    EIN 208181832 · Headquarters: GREENWICH, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  95. The Jonah Center for Earth and Art

    EIN 050610255 · Headquarters: PORTLAND, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  96. The Lake Basile Association

    EIN 452052177 · Headquarters: GRANBY, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  97. The Lake Waramaug Association Inc

    EIN 066178754 · Headquarters: NEW PRESTON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  98. The Last Green Valley Inc the Last Green Valley Inc

    EIN 061418894 · Headquarters: DANIELSON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  99. The Long Island Sound Foundation Inc

    EIN 061332276 · Headquarters: ESSEX, CT, USA · Environment · Latest available filing year: 2015 · Primary form: IRS Form 990-EZ

  100. The Magnaverde Foundation Inc

    EIN 061442891 · Headquarters: GREENWICH, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

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