Index Every US public charity, on the record

Environment in Wisconsin

805 public charities the IRS codes as environment, 243 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
Areca Sol CorporationHartford	Form 990-N	No figure
Turners Nuture in Nature Preserve IncWaupaca	Form 990-N	No figure
Crescent Cactus CorporationMilwaukee	Form 990-N	No figure
Strohman ParkMarshfield	Form 990-N	No figure
Steel the FuturePewaukee	Form 990-N	No figure

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By size

Under $50K523
$50K to $500K159
$500K to $1M33
$1M to $2.5M30
$2.5M to $5M13
Over $5M9
No figure on file38

Size classes

Peers are ranked inside these.

$50K to $500K
158 organizations, median $136K
$500K to $5M
76 organizations, median $1.18M
Over $5M
9 organizations, median $6.04M

Most common codes

Natural resources conservation and protection
NTEE C30
208
Water resources, wetlands conservation and management
NTEE C32
187
Environmental education
NTEE C60
70
Garden clubs
NTEE C42
60
Land resources conservation
NTEE C34
49
Other environment
NTEE C99
46
Environmental beautification
NTEE C50
32
Alliances and advocacy
NTEE C01
25

Cities

Madison
71
Milwaukee
43
Appleton
14
Hayward
12
Eagle River
11
Green Bay
10
Stevens Point
9
Viroqua
9
West Bend
9
Hudson
8

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.