| Biodiversity Research Institute: Loons: Small, nonprofit group dedicated to progressive environmental research and education. Specialty is avian (bird) studies, and aquatic toxicology with a focus on the loon. |
| Echo Lake Association: Property owners and other parties interested in lake quality in Fayette, Mt Vernon, and Readfield. |
| Environmental Protection Agency Region 1: Superfund Site Index: Places targeted in Maine for government sponsored toxic waste cleanup. |
| Forest Ecology Network: Mission is to protect, preserve, and defend the native forest environment of Maine through public awareness, grassroots citizen activism, and education. |
| Friends of Hog Island: Non-profit dedicated to the preservation of the Audubon Camp on Hog Island and the support and enhancement of its educational goals. |
| Friends of Schoodic: A non-profit organization dedicated to protecting the natural environment of the Schoodic District of Acadia National Park.. |
| Gulf of Maine Council: Promotes stewardship activities in the Gulf of Maine and its watershed, to enhance environmental quality and secure resource use for all generations. |
| Humboldt Field Research Institute: Institute for the study of natural history in Maine. |
| Lakes Environmental Association: A private, non-profit organization founded in Naples to protect the water quality and watersheds of the Sebago-Long Lake Region. Covers the towns of Bridgton, Denmark, Harrison, Naples, Sweden, Waterford and Sebago Lake. |
| Maine Coast Heritage Trust: Conserving Maine shorelands and islands by working with communities and individuals along the coast. Links to Maine Land Trust. Newsletter and membership information. |
| Maine Environmental Policy Institute: Dedicated to researching environmental challenges facing the state and reporting the research to policy makers and the public. |
| Maine Olmsted Alliance: Promotes the preservation and protection of state historic parks and cultural landscapes. Provides pictures, survey, journal, news, and information. |
| Maine WasteWater Control Association: Promotes environmental management practices to protect and improve the waters and related environments. Includes membership, position, calendar, and directory. |
| Marine Environmental Research Institute: Dedicated to researching pollution of the ocean, unsustainable coastal development, species and habitat degradation, and environmental emergencies (toxic spills, releases) affecting marine life. |
| Penobscot BayWatch: Protecting and restoring the ecology and environment of Penobscot Bay, through research, advocacy, and community empowerment. |
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