Charities United States Environment 3rivers Incorporated
3rivers Incorporated logo

3rivers Incorporated

The Agency provides a residential setting to assist adults with developmental disabilities to accomplish and maintain their highest attainable living skills and to improve their quality of life …

Group Main Stream Incorporated

Westbrook, ME EIN 010371245 · IRS Sign up to see website
Claim this charity
Ready to give?
100% goes to 3rivers Incorporated

GiveRadar doesn't take a cut. Donate directly on their site.

Make your donation
89
Integrity Assessment
Strong transparency
89/100 · methodology

About 3rivers Incorporated

At 3Rivers, we support people with disabilities across Maine to live purposeful, connected, and independent lives with dignity, choice, and joy

Founded
Headquarters
Westbrook, ME
Foundation type
Publicly-supported charity (509(a)(2))
IRS subsection
501(c)(03)
Ruling date
Size
large

Verified certifications

Confirmed against the issuing authority - not self-reported.

IRS Tax-Deductible since 1988

Mission

The Agency provides a residential setting to assist adults with developmental disabilities to accomplish and maintain their highest attainable living skills and to improve their quality of life by supporting independence.The Agency owns and operates 8 group homes in Portland, Maine. The Agency also rents a house and apartments in the greater Portland, Maine area to provide supported living programs for its consumers.

Focus areas & reach

· What they work on and where
🌿 Environment
Cause tags

How it stacks up against peers

· vs. 5 similar environment in United States
Program spending This charity: 0%
Peer average: 0%
CEO comp as % of revenue This charity: 0.95%
Peer average: 0.48%
Integrity Assessment This charity: 89
Peer average: 89

Red flags

· All clear
IRS revocation history
OFAC / EU / UN sanctions
Open investigations
Governance scandals
Related-party deals
Excessive exec comp

Common questions

· Auto-generated from filings + methodology

3rivers Incorporated is a registered environment nonprofit based in Westbrook, ME, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 1980 and has been operating for 46 years. Its EIN is 010371245. It has a GiveRadar Integrity Assessment of 89/100 (Strong transparency), indicating well-documented governance, financials, and contact details. The organization reports $14M in annual revenue. 39 officers and directors are publicly disclosed. No red flags have been detected.

3rivers Incorporated has a GiveRadar Integrity Assessment of 89/100. This score combines five components: Registration (20 pts), Financial Transparency (30 pts), Governance (20 pts), Contact Availability (10 pts), and Data Recency (20 pts), with negative adjustments for any red flags. A score of 89 ('Strong transparency') reflects well-documented governance, recent financials, named leadership, and working contact details. For comparison, the average integrity assessment for environment charities in United States is 89/100.

3rivers Incorporated is located in Westbrook, ME, United States. The organization was established in 1980 and has been active for 46 years.

Based on official tax filings, 3rivers Incorporated has $14M in annual revenue. Its revenue is significantly above the peer average of $2M. Create a free GiveRadar account to view the complete financial breakdown with year-over-year trends.

3rivers Incorporated is classified as a Environment organization, registered in United States. It operates as a Publicly-supported charity (509(a)(2)). By size, it is categorized as a large organization. It has $14M in annual revenue. The organization has 39 disclosed officers and directors.

No red flags have been detected for 3rivers Incorporated. GiveRadar automatically screens charities for concerning patterns including high executive compensation, low program spending, and missing financial filings. Based on available official data, no issues have been identified.

3rivers Incorporated has a GiveRadar Integrity Assessment of 89/100 (Strong transparency) and no red flags have been detected, which suggests it is a well-documented organization. It is regulated by the IRS. You can donate directly through their official donation page linked on their GiveRadar profile. GiveRadar provides data for research purposes and does not endorse any organization. Always do your own due diligence.

At 3Rivers, we support people with disabilities across Maine to live purposeful, connected, and independent lives with dignity, choice, and joy 3rivers Incorporated is classified as a environment organization registered in United States. The organization was founded in 1980.

Among environment charities registered in United States: 3rivers Incorporated's GiveRadar Integrity Assessment of 89/100 is in line with the peer average of 89/100. Its annual revenue of $14M is well above the peer average of $2M.

Yes, donations to 3rivers Incorporated are generally tax-deductible in the United States. 3rivers Incorporated is a 501(c)(3) tax-exempt organization. Its EIN is 010371245, which you can use for tax filing purposes. Donors can typically deduct contributions on their federal income tax return if they itemize deductions. Consult a tax professional for guidance specific to your situation.

Verified against 4 official sources, last refreshed .

Annual revenue
$10M-$100M
0% to programs
Source: IRS 990 (FY2025) why this matters
Unlock exact figures

Filing history

6 years on file from IRS 990 (FY2025): revenue, expenses, program spending, assets, and liabilities by fiscal year.

Years on record: FY2025, FY2024, FY2023, FY2022, FY2021, FY2020.
Financial details are free - with a GiveRadar account

See 5 years of revenue, expense breakdowns, and balance sheet.

Sign up to view
Already have an account? Log in
No credit card · Takes 20 seconds

Taxes

Tax-deductibility for donors

Donations may be tax-deductible for residents of United States under local rules. Confirm with the charity directly.

Always confirm tax treatment with the charity directly or your tax advisor before donating.

Leadership

AN
Ann-Marie Mayberry
Executive Director

Officers & trustees (9)

Source: Public filings

AN
Ann-Marie M•••••••
EXECUTIVE DI
BA
Barbara K•••••
Director
HA
Harrison D•••
Director
JE
Jeff B••••
Director
KA
Katlyn D•••••••
VICE PRESIDE
MA
Marie G•••
PRESIDENT
MA
Mary A•••••
TREASURER
MO
Mona H••••••
SECRETARY
SA
Sally S•••••••
Director
Full names, contact details & compensation

Free with an account.

Unlock

Latest news

From global news sources

No recent news coverage found

News coverage will appear here when articles mention this organization.

Activity timeline

Filings and press mentions, merged

Form filed
$14.0M revenue
FY2025
IRS_990
Form filed
$13.1M revenue
FY2024
IRS_990
Form filed
$13.0M revenue
FY2023
IRS_990
Form filed
$15.0M revenue
FY2022
IRS_990
Form filed
$12.3M revenue
FY2021
IRS_990
Form filed
$11.8M revenue
FY2020
IRS_990

No reviews yet. Be the first to share your experience.

Have you donated or volunteered here?

Share your experience - it takes 30 seconds. Verified reviews help other donors decide.

Sign up to write a review

Peer charities

Other environment in United States, by integrity assessment

Charity Score Revenue Program %
3rivers Incorporated This page 89 $14.0 million -
Bass River Day Activity Program Inc 89 $13.5 million -
Utah Open Lands Conservation Association Inc 89 $11.4 million -
Truckee Donner Land Trust 89 $10.5 million -
Earthshare 89 $37.3 million -
Chesapeake Bay Trust 89 $36.0 million -

Sources and verification

Refreshed

Registration and legal identity
Internal Revenue Service (IRS) - Tax Exempt Organization Search
Financial filings
IRS Form 990 filings - Fiscal year 2025 most recent on file.
Officers and trustees
Internal Revenue Service (IRS) - Tax Exempt Organization Search - 39 disclosed in the public registry.
Supplementary verification
Charity Navigator

Data freshness

Last updated
May 27, 2026
Profile completeness
90%

What we don't know

Honest gaps - our score reflects transparency, not impact

Programs & projects
No named programs listed by the charity
Operating reach
Countries where programs run not specified

Methodology

GiveRadar combines public registry filings, ProPublica Nonprofit Explorer, Charity Navigator, GuideStar, and news archives into a single 0-100 integrity assessment. We don't take a cut of any donation, ever.

Read full methodology

Quick facts about 3rivers Incorporated

What is 3rivers Incorporated?
3rivers Incorporated is a environment publicly-supported charity (509(a)(2)) based in Westbrook, United States. At 3Rivers, we support people with disabilities across Maine to live purposeful, connected, and independent lives with dignity, choice, and joy
When was 3rivers Incorporated founded?
3rivers Incorporated was founded in 1980.
Who leads 3rivers Incorporated?
Ann-Marie Mayberry serves as Executive Director.
Where is 3rivers Incorporated located?
Headquartered in Westbrook, United States.
What is 3rivers Incorporated's annual budget?
Annual revenue for fiscal year 2025 is approximately $10M-$100M. 0% of expenses go to program services.
Is 3rivers Incorporated trustworthy?
3rivers Incorporated has a GiveRadar Integrity Assessment of 89 out of 100 (Strong transparency). The score reflects public-data transparency: registration, financial disclosure, governance, contact details, and how recently data was refreshed. It does not measure program impact.
What is 3rivers Incorporated's registration number?
IRS EIN: 010371245.
What is 3rivers Incorporated's website?
http://www.gmsme.org