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. The Natural Guard

    EIN 521656756 · Headquarters: new haven, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  2. The Ocean View Foundation Inc

    EIN 223636378 · Headquarters: COS COB, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  3. The Old Stone Mill Foundation

    EIN 813365000 · Headquarters: Colchester, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  4. The Perry House Foundation Inc

    EIN 134268594 · Headquarters: STRATFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  5. The Pomperaug River Watershed Coalition Inc

    EIN 061583895 · Headquarters: WOODBURY, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  6. The Reconnstruction Center Inc

    EIN 651160727 · Headquarters: New Britain, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  7. The Ridgefield Garden Club

    EIN 061527913 · Headquarters: Ridgefield, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  8. The Solar Building Association Incorporated

    EIN 237651008 · Headquarters: Rocky Hill, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  9. The Susan Elaine Foundation Inc

    EIN 853752468 · Headquarters: OLD SAYBROOK, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  10. The Trumbull Land Trust Inc

    EIN 061233677 · Headquarters: Trumbull, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  11. The Wellspring Commons Stewards Inc

    EIN 921325951 · Headquarters: Litchfield, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  12. The Westport Woman's Club Incorporated

    EIN 060646962 · Headquarters: WESTPORT, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  13. The White Memorial Conservation Center

    EIN 066065807 · Headquarters: LITCHFIELD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. The Woodbridge Land Trust Incorporated

    EIN 066067127 · Headquarters: WOODBRIDGE, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  15. Three Tiers for Connecticut Inc

    EIN 841940167 · Headquarters: NORWALK, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  16. Tidewater Institute

    EIN 205674863 · Headquarters: Old Saybrook, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  17. Tightlined Conservation Coalition Inc

    EIN 834482511 · Headquarters: Lyme, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  18. Transportation Energy Partnership

    EIN 043398439 · Headquarters: South Windsor, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  19. Transportation Energy Partnership - Greater New Haven Clean Cities Coalition

    EIN 061572258 · Headquarters: NEW HAVEN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  20. Tree Conservancy of Darien

    EIN 272139746 · Headquarters: Darien, CT, US · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  21. Tree Wardens Association of Connecticut Inc

    EIN 223292354 · Headquarters: Wallingford, CT, US · Environment · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  22. Tributary Mill Conservancy

    EIN 611460758 · Headquarters: Old Lyme, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  23. Tucker Memorial Fund

    EIN 830592170 · Headquarters: Fairfield, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. Tyler Lake Protective Association

    EIN 814036933 · Headquarters: Goshen, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  25. United States Green Parking Co

    EIN 272760767 · Headquarters: NEW HAVEN, CT, USA · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990

  26. Upcycle4good Foundation

    EIN 850557721 · Headquarters: Windsor Locks, CT, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  27. Valley Shore Waterfowers Inc

    EIN 061212514 · Headquarters: GUILFORD, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  28. Vernon Garden Club

    EIN 061627888 · Headquarters: Vernon, CT, US · Environment · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  29. Voda Foundation

    EIN 815224093 · Headquarters: Greenwich, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  30. Wallingford Land Trust Inc The

    EIN 060982140 · Headquarters: Wallingford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  31. Warren Land Trust Inc

    EIN 223018018 · Headquarters: WARREN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  32. Washington Environmental Council Inc

    EIN 060916292 · Headquarters: Washington, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  33. Waste Free Greenwich Inc

    EIN 922949060 · Headquarters: Old Greenwich, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  34. Water Innovations Alliance Foundation

    EIN 270624903 · Headquarters: FAIRFIELD, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  35. Waterbury Environmental Health Fund

    EIN 394465819 · Headquarters: Waterbury, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  36. Waterbury Land Trust Inc

    EIN 061526265 · Headquarters: Waterbury, CT, US · Environment · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  37. Waterford Land Trust Inc

    EIN 237350401 · Headquarters: Waterford, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  38. Watershed Partnership Inc

    EIN 300273485 · Headquarters: Gulford, CT, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  39. Waveny Park Conservancy Inc

    EIN 474280308 · Headquarters: NEW CANAAN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  40. Webb Mountain Discovery Zone Incorporated

    EIN 845151957 · Headquarters: Monroe, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  41. Wernickes Foundation of America Inc

    EIN 824047166 · Headquarters: Greenwich, CT, US · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  42. West Beach Association

    EIN 471047862 · Headquarters: Westbrook, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  43. West Hartford Land Trust Inc C/o David Sagers

    EIN 043724571 · Headquarters: WEST HARTFORD, CT, USA · Environment · Latest available filing year: 2022 · Primary form: IRS Form 990-EZ

  44. West Hartford Tree Project

    EIN 372173520 · Headquarters: West Hartford, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. West Haven Center for Coastal Ecology

    EIN 061496708 · Headquarters: West Haven, CT, US · Environment · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  46. West Rock Ridge Park Association Inc

    EIN 862014812 · Headquarters: Hamden, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  47. West Woodstock Library Association

    EIN 061516277 · Headquarters: Woodstock, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  48. Western United Extreme Inc

    EIN 711052088 · Headquarters: Newtown, CT, USA · Environment · Latest available filing year: 2013 · Primary form: IRS Form 990-EZ

  49. Weston Garden Club Inc

    EIN 854348878 · Headquarters: Weston, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  50. Westport Evergreen Inc

    EIN 814711618 · Headquarters: Westport, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Wholesome Wave Inc

    EIN 260352899 · Headquarters: BRIDGEPORT, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  52. Wild Lake Association Inc

    EIN 113807405 · Headquarters: MERIDEN, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  53. Wildshare Inc

    EIN 061508616 · Headquarters: GEORGETOWN, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  54. Willimantic River Alliance Inc

    EIN 203121941 · Headquarters: Bolton, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  55. Willimantic Whitewater Partnership Inc

    EIN 200905978 · Headquarters: Willimantic, CT, US · Environment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  56. Wilton Garden Club

    EIN 066039718 · Headquarters: WILTON, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  57. Wilton Land Conservation Trust

    EIN 066070618 · Headquarters: Wilton, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  58. Winchester Land Trust Inc

    EIN 061263180 · Headquarters: WINCHESTER CENTER, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  59. Windsor Land Trust Inc

    EIN 134222707 · Headquarters: Windsor, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  60. Woodcock Nature Center

    EIN 237232984 · Headquarters: Wilton, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  61. Woodland Heights Open Space Association Inc

    EIN 822486440 · Headquarters: SOUTHINGTON, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  62. Woodsmen Land Trust Inc

    EIN 273781914 · Headquarters: Old Saybrook, CT, US · Environment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  63. Wyassup Lake Improvement Association Inc

    EIN 994772028 · Headquarters: North Stonington, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. Wyndham Land Trust Inc

    EIN 060948844 · Headquarters: POMFRET CENTER, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  65. Y-house

    EIN 474357018 · Headquarters: New Haven, CT, US · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  66. Yale Blue Green Inc

    EIN 393844027 · Headquarters: Fairfield, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

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