Index Every US public charity, on the record

Environment in Maine

407 public charities the IRS codes as environment, 149 of them reporting revenue of $50,000 or more.

Organizations

Largest first

By revenue on the last return. Organizations that file Form 990-N report no figures and come last.

Organization	Return	Revenue
Owls Head South Thomaston and Thomaston Solid Waste CorporationThomaston	None required	No figure
Center for an Ecology-Based EconomyNorway	Form 990 or 990-EZ	No figure
Royal River AllianceYarmouth	Form 990-N	No figure
Webber Pond Association IncVassalboro	Form 990-N	No figure
SharecenterLewiston	Form 990-N	No figure
Biddeford Pool Conservation TrustBiddeford Pool	Form 990 or 990-EZ	No figure
Sabattus Pond Watershed ProjectSabattus	Form 990-N	No figure

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By size

Under $50K233
$50K to $500K80
$500K to $1M28
$1M to $2.5M19
$2.5M to $5M14
Over $5M8
No figure on file25

Size classes

Peers are ranked inside these.

$50K to $500K
80 organizations, median $196K
$500K to $5M
61 organizations, median $1.13M
Over $5M
8 organizations, median $8.91M

Most common codes

Natural resources conservation and protection
NTEE C30
85
Water resources, wetlands conservation and management
NTEE C32
84
Land resources conservation
NTEE C34
60
Environmental education
NTEE C60
33
Garden clubs
NTEE C42
28
Other environment
NTEE C99
27
Alliances and advocacy
NTEE C01
14
Environmental beautification
NTEE C50
14

Cities

Portland
25
Augusta
18
Yarmouth
11
Camden
8
Blue Hill
7
South Portland
7
Bridgton
6
Scarborough
6
York
6
Auburn
5

Source. IRS public records, as of October 13, 2026. Financial figures are from the most recent return on file. Street addresses are not published here.

Peers. Public charities with the same focus group, state and size class, and a return no more than 33 months old.

Scope. The Index covers the 501(c)(3) organizations the IRS classes as publicly supported charities, in the 50 states and the District of Columbia. Churches, schools, hospitals and supporting organizations are classed separately and are not included.