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Nonprofit · EIN 55-0893544

ARIZONA HYDROLOGICAL SOCIETY FOUNDATION

Tax-exempt · TUCSON, AZ 85728

Financials

$233K$26K2023$356K$96K2024$852K$93K2025
Revenue Expenses · by fiscal year end
Financials of ARIZONA HYDROLOGICAL SOCIETY FOUNDATION by year, from its e-filed returns
Year endedFormRevenueExpensesNet incomeTotal assetsLiabilitiesNet assets
December 31, 2025990$852,354$93,035$759,319$1,832,173$0$1,832,173
December 31, 2024990$356,301$95,739$260,562$967,712$0$967,712
December 31, 2023990$232,799$25,773$207,026$707,150$0$707,150
Financial details: 990 for the year ended December 31, 2025

Revenue

Contributions, gifts and grants
$819,591
Program service revenue
$0
Investment income
$32,763
Net gain from sales of assets
$5,626
Other revenue
$0

Expenses

Grants and similar amounts paid
$84,000
Compensation of officers, directors and key employees
$0
Salaries, compensation and benefits (total)
$0
Professional fundraising fees
$0
Legal fees
$10
Accounting fees
$835
Program services (functional)
$84,715
Management and general (functional)
$8,320

Balance sheet and other

Total assets, start of year
$967,712
Total assets, end of year
$1,832,173
Total liabilities, end of year
$0
Net assets, end of year
$1,832,173
Publicly traded securities
$1,002,481
Net assets without donor restrictions
$1,813,387
Net assets with donor restrictions
$18,786
Gross receipts
$1,000,218
Employees
0
Volunteers
9
Year formed
2005
State of legal domicile
AZ

From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.

Officers, directors and key employees

As listed on the 990 for the year ended December 31, 2025, highest compensation first.

NameTitleHours / weekCompensation
David ChristianaPresident
Trustee or director, Officer
10$0
Christie O'DayVice President
Trustee or director, Officer
2$0
Beth ProffittSecretary
Trustee or director, Officer
2$0
Howard GrahnTreasurer
Trustee or director, Officer
10$0
Errol MontgomeryDirector
Trustee or director
2$0
Chris BrooksDirector
Trustee or director
2$0
Erin YoungDirector
Trustee or director
2$0
Michael PearceDirector
Trustee or director
2$0
Don BillsDirector
Trustee or director
2$0
990 for the year ended December 31, 2024: 9 people
NameTitleHours / weekCompensation
Christoper BrooksDirector
Trustee or director
2$0
Errol MontgomeryDirector
Trustee or director
2$0
Michael PearceDirector
Trustee or director
2$0
Erin YoungDirector
Trustee or director
2$0
David ChristianaPresident
Trustee or director
15$0
Elizabeth ProffittSecretary
Officer
15$0
Donald BillsDirector
Officer
2$0
Howard GrahnTreasurer
Officer
15$0
Christie O'DayVice President
Officer
15$0
990 for the year ended December 31, 2023: 9 people
NameTitleHours / weekCompensation
CHRISTOPHER BROOKSDIRECTOR
Trustee or director
2$0
ERROL L MONTGOMERYDIRECTOR
Trustee or director
2$0
MICHAEL J PEARCEDIRECTOR
Trustee or director
2$0
ELIZABETH PROFFITTDIRECTOR
Trustee or director
2$0
ERIN YOUNGDIRECTOR
Trustee or director
2$0
DONALD J BILLSPREIDENT
Officer
15$0
DAVID CHRISTIANAVICE-PRESIDE
Officer
15$0
HOWARD GRAHNTREASURER
Officer
15$0
DENNIS HALLSECRETARY
Officer
15$0

Address and contacts

Address (IRS master file)
PO BOX 66051, TUCSON, AZ 85728-6051
In care of
% HOWARD GRAHN
Mailing address (990-N for 2021)
PO Box 65690, Tucson AZ 85728
Principal officer (990 for 2025)
Howard Grahn, 3975 N Pontatoc Rd, TUCSON, AZ 85718
Principal officer (990-N for 2021)
Howard Grahn, 3975 N Pontatoc Road, Tucson AZ 85718
Signed the 990
Howard Grahn, Treasurer
Return prepared by
Darin Guthrie CPAPLLC

Mission

To increase, invest, safeguard, and distribute the assets of the foundation in support of education, analysis, and communication in hydrological and related sciences in Arizona and the Southwest

990 for the year ended December 31, 2025

Program accomplishments

  • In 2025, the Foundation provided 24,715 either directly to students as internships, scholarships, or cash awards, or as program financial support. The three largest programs are 1 University academic scholarships, 11,000 2 Intern working scholarships, 12,000 3 Student professional meeting support, 1,715. It is estimated that over two hundred students benefit from our programs annually.
    Expenses $24,715 · grants $23,000
  • A University of Arizona Professor was funded to develop a new Hydrology program
    Expenses $60,000 · grants $60,000

What it must file and when

IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025December 31, 2025May 15, 2026990 on file
2024December 31, 2024May 15, 2025990 on file
2023December 31, 2023May 15, 2024990 on file

IRS record

EIN
55-0893544
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
Publicly supported organization (509(a)(2))
Donations deductible (Pub 78)
Public charity, 50% deduction limit
Exempt since
2010
Accounting year ends
December
Files
Form 990 or 990-EZ
Assets (IRS master file)
$1,832,173
Income (IRS master file)
$1,000,218

Filing history

FormYear endedRevenueExpensesAssetsReturn
990December 2025$852,354$93,035$1,832,173XML
990December 2024$356,301$95,739$967,712XML
990December 2023$232,799$25,773$707,150XML
990December 2022$69,658$21,087$500,124IRS
990-N for 2021
Officer: Howard Grahn
December 31, 2021≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Howard Grahn
December 31, 2020≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Howard Grahn
December 31, 2019≤ $50,000 receipts––e-Postcard

990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 55-0893544).

Questions about ARIZONA HYDROLOGICAL SOCIETY FOUNDATION

What is the EIN of ARIZONA HYDROLOGICAL SOCIETY FOUNDATION?
The employer identification number (EIN) of ARIZONA HYDROLOGICAL SOCIETY FOUNDATION is 55-0893544.
Is ARIZONA HYDROLOGICAL SOCIETY FOUNDATION tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2010.
Are donations to ARIZONA HYDROLOGICAL SOCIETY FOUNDATION tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does ARIZONA HYDROLOGICAL SOCIETY FOUNDATION file?
Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
When is the next return of ARIZONA HYDROLOGICAL SOCIETY FOUNDATION due?
The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
When did ARIZONA HYDROLOGICAL SOCIETY FOUNDATION last file with the IRS?
The latest return in the IRS public files is the 990 for the year ended December 2025.
Who is the principal officer of ARIZONA HYDROLOGICAL SOCIETY FOUNDATION?
The 990 for the year ended December 31, 2025 names Howard Grahn.
Who are the officers and directors of ARIZONA HYDROLOGICAL SOCIETY FOUNDATION?
The 990 for the year ended December 31, 2025 lists 9 people; 0 received compensation from the organization.
How much revenue does ARIZONA HYDROLOGICAL SOCIETY FOUNDATION have?
On its 990 for the year ended December 31, 2025 it reported revenue of $852,354, expenses of $93,035 and total assets of $1,832,173 at year end.

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