Nonprofit · EIN 33-0576233
HYDROLOGIC RESEARCH CENTER
Tax-exempt · SAN DIEGO, CA 92127
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| September 30, 2025 | 990 | $2,325,761 | $2,472,268 | -$146,507 | $1,118,898 | $578,985 | $539,913 |
| September 30, 2024 | 990 | $3,026,806 | $2,705,746 | $321,060 | $1,992,736 | $1,306,316 | $686,420 |
| September 30, 2023 | 990 | $3,214,589 | $3,345,109 | -$130,520 | $1,043,951 | $678,591 | $365,360 |
Financial details: 990 for the year ended September 30, 2025
Revenue
- Contributions, gifts and grants
- $2,322,527
- of which government grants
- $2,199,327
- Program service revenue
- $0
- Investment income
- $0
- Other revenue
- $3,234
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $560,034
- Other salaries and wages
- $921,940
- Salaries, compensation and benefits (total)
- $1,944,507
- Professional fundraising fees
- $0
- Accounting fees
- $46,264
- Occupancy
- $63,065
- Travel
- $57,945
- Depreciation
- $16,693
- Program services (functional)
- $1,722,246
- Management and general (functional)
- $750,022
Balance sheet and other
- Total assets, start of year
- $1,992,736
- Total assets, end of year
- $1,118,898
- Total liabilities, end of year
- $578,985
- Net assets, end of year
- $539,913
- Land, buildings and equipment
- $33,250
- Net assets without donor restrictions
- $505,332
- Net assets with donor restrictions
- $34,581
- Gross receipts
- $2,325,761
- Employees
- 19
- Year formed
- 1993
- State of legal domicile
- CA
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 September 30, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| DR Olufemi Osidele | CEO Officer | 40 | $231,907 | $19,709 |
| JASON SPERFSLAGE | Treasurer Trustee or director, Officer | 40 | $165,137 | $15,194 |
| EYLON SHAMIR | ENGINEER | 40 | $144,384 | $32,865 |
| Dr Theresa Modrick Hansen | Secretary Trustee or director, Officer | 40 | $165,172 | $8,259 |
| CHRISTOPHER SPENCER | COMPUTER PROGRAMME | 40 | $128,177 | $11,014 |
| ROCHELLE CAMPBELL | METEOROLOGIST | 40 | $105,096 | $14,305 |
| MEHRET ISAAC | FINANCIAL MANAGER | 40 | $102,060 | $5,103 |
| DR KONSTANTINE GEORGAKAKOS | President Trustee or director, Officer | 40 | $0 | $0 |
| ROBERT HARTMAN | Director Trustee or director | 2 | $0 | $0 |
| RAYMOND BAN | Director Trustee or director | 2 | $0 | $0 |
990 for the year ended September 30, 2024: 10 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| DR KONSTANTINE GEORGAKAKOS | President Trustee or director, Officer | 40 | $245,229 | $1,433 |
| DR Olufemi Osidele | CEO Officer | 40 | $209,299 | $19,844 |
| JASON SPERFSLAGE | Treasurer Trustee or director, Officer | 40 | $198,388 | $15,131 |
| EYLON SHAMIR | ENGINEER | 40 | $152,229 | $32,783 |
| CHRISTOPHER SPENCER | COMPUTER PROGRAMME | 40 | $156,208 | $10,917 |
| Dr Theresa Modrick Hansen | Secretary Trustee or director | 2 | $157,881 | $8,176 |
| ROCHELLE CAMPBELL | METEOROLOGIST | 40 | $114,522 | $14,373 |
| BARBARA HANSEN | ADMINISTRATIVE ASS | 40 | $125,020 | $3,792 |
| ROBERT HARTMAN | Director Trustee or director | 2 | $0 | $0 |
| RAYMOND BAN | Director Trustee or director | 2 | $0 | $0 |
990 for the year ended September 30, 2023: 12 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| DR KONSTANTINE GEORGAKAKOS | President Trustee or director, Officer | 40 | $241,511 | $12,820 |
| ROBERT JUBACH - RESIGNED | Secretary Trustee or director, Officer | 40 | $185,587 | $10,532 |
| JASON SPERFSLAGE | Treasurer Trustee or director, Officer | 40 | $150,800 | $13,420 |
| EYLON SHAMIR | ENGINEER | 40 | $126,533 | $28,236 |
| THERESA MODRICK HANSEN | ENGINEER | 40 | $136,537 | $8,562 |
| CHRISTOPHER SPENCER | COMPUTER PROGRAMME | 40 | $110,106 | $10,009 |
| BARBARA HANSEN | ADMINISTRATIVE ASS | 40 | $108,760 | $5,896 |
| ROBERT HARTMAN | Director Trustee or director | 2 | $0 | $0 |
| DR ANATASIOS TSONIS | Director Trustee or director | 2 | $0 | $0 |
| Olufemi Osidele | CEO Trustee or director, Officer | 40 | $0 | $0 |
| RICHARD KENNEDY | Director Trustee or director | 2 | $0 | $0 |
| RAYMOND BAN | Director Trustee or director | 2 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- 16870 W BERNARDO DR STE 380, SAN DIEGO, CA 92127-1678
- Principal officer (990 for 2024)
- DR OLUFEMI OSIDELE
- Signed the 990
- DR OLUFEMI OSIDELE, CEO
- Phone
- (858) 798-9440
- Website
- www.hrcwater.org
- Return prepared by
- Leaf & Cole LLP
Mission
HYDROLOGIC RESEARCH CENTER'S MISSION IS TO ADVANCE THE SCIENCE AND ENGINEERING OF HYDROLOGY THROUGH BASIC AND APPLIED RESEARCH AND TECHNOLOGY TRANSFER OF ACTIVITIES. THE ORGANIZATION IS INVOLVED IN THE DESIGN, DEVELOPMENT, IMPLEMENTATION, AND TESTING OF PROTOTYPE MEASUREMENT SIMULATION AND FORECAST OPERATIONAL SYSTEMS. IT ALSO PROVIDES TRAINING SERVICES, INCLUDING THE DEVELOPMENT OF EDUCATIONAL COURSES AND TEACHING MATERIALS.
Program accomplishments
- THE ORGANIZATION IS INVOLVED IN THE DESIGN, DEVELOPMENT, IMPLEMENTATION, AND TESTING OF PROTOTYPE MEASUREMENT SIMULATION AND FORECAST OPERATIONAL SYSTEMS. IT ALSO PROVIDES TRAINING SERVICES, INCLUDING THE DEVELOPMENT OF EDUCATIONAL COURSES AND TEACHING MATERIALS.Expenses $1,722,246
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 September, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | September 30, 2026 | February 15, 2027 | Not due yet |
| 2024 | September 30, 2025 | February 16, 2026 | 990 on file |
| 2023 | September 30, 2024 | February 17, 2025 | 990 on file |
IRS record
- EIN
- 33-0576233
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1993
- Accounting year ends
- September
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Environment (C053)
- Assets (IRS master file)
- $1,118,898
- Income (IRS master file)
- $2,325,761
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | September 2025 | $2,325,761 | $2,472,268 | $1,118,898 | XML |
| 990 | September 2024 | $3,026,806 | $2,705,746 | $1,992,736 | XML |
| 990 | September 2023 | $3,214,589 | $3,345,109 | $1,043,951 | XML |
| 990 | September 2022 | $2,134,880 | $2,120,055 | $1,964,474 | IRS |
| 990 | September 2021 | – | – | – | IRS |
| 990 | September 2020 | – | – | – | IRS |
| 990 | September 2019 | – | – | – | IRS |
| 990 | September 2018 | – | – | – | IRS |
990-N: the IRS publishes only the latest e-Postcard per organization; earlier years appear here as 990.tax collects the monthly files. 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.
Questions about HYDROLOGIC RESEARCH CENTER
- What is the EIN of HYDROLOGIC RESEARCH CENTER?
- The employer identification number (EIN) of HYDROLOGIC RESEARCH CENTER is 33-0576233.
- Is HYDROLOGIC RESEARCH CENTER tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1993.
- Are donations to HYDROLOGIC RESEARCH CENTER tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does HYDROLOGIC RESEARCH CENTER 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 HYDROLOGIC RESEARCH CENTER due?
- The return for tax year 2025 (the year ending September 30, 2026) is due February 15, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did HYDROLOGIC RESEARCH CENTER last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended September 2025.
- Who is the principal officer of HYDROLOGIC RESEARCH CENTER?
- The 990 for the year ended September 30, 2025 names DR OLUFEMI OSIDELE.
- Who are the officers and directors of HYDROLOGIC RESEARCH CENTER?
- The 990 for the year ended September 30, 2025 lists 10 people; 7 received compensation from the organization, the highest $231,907 (DR Olufemi Osidele, CEO).
- How much revenue does HYDROLOGIC RESEARCH CENTER have?
- On its 990 for the year ended September 30, 2025 it reported revenue of $2,325,761, expenses of $2,472,268 and total assets of $1,118,898 at year end.
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