California · Nonprofit
HUMANE SOCIETY OF SONOMA COUNTY
HUMANE SOCIETY OF SONOMA COUNTY (California) receives grants from 84 organizations whose IRS filings report $4,097,503 to it, the largest being NATIONAL PHILANTHROPIC TRUST ($673,150). 44 of them have funded it in more than one year, and 63% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- Revenue FY2025
- $5.1M
- Funders on record
- 84
- Grants received
- $4.1M
- Net assets
- $9.0M
What Humane Society of Sonoma County does
Mission
To save lives and benefit the well-being of pets and their people with kindness, innovation, and leadership.
As stated on its FY2025 Form 990.
Programs
The Humane Society of Sonoma County operates three veterinary medical facilities: shelter medicine, the spay & neuter clinic, and the community veterinary clinic, which provides low-cost veterinary services to sonoma county residents who qualify based on income.
$1,946,224 spent$648,646 earned by the program49% of program spendingThe shelter - the society's shelter provides a safe haven and care for abandoned, injured, abused, and rescued animals. Through its veterinary services, foster network, spay and neuter services, and enrichment programs, animals receive expert medical care, socialization and training as they are readied for adoption. The society is a managed admission shelter which employs pet retention strategies to help pets remain in their homes. In accordance with the asilomar accords, we are a community and socially conscious organization that has a 97% live-release rate.
$1,877,618 spent$522,935 earned by the program47% of program spendingOther services - the society provides a wide range of services aimed at enhancing the bond between people and animals. These services include dog training classes and humane education.
$154,006 spent$156,350 earned by the program4% of program spending
The 3 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $3,977,848.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2020 to 2021, from $11M to $12M (+10%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2020 10% · 2021 11% · 2023 15% · 2025 1%. Grants only. Government contracts and fees sit inside program revenue.
68% of HUMANE SOCIETY OF SONOMA COUNTY’s revenue is contributions — about as donation-reliant as the typical peer (74% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 3 of the last 8 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
The chief executive listed changed between the FY2021 and FY2022 filings.
Who funds it, year by year
2017 → 2023: the base narrowed from 32 funders to 25 funders, grant income rose $361k → $909k.
16 of 84 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 63% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of HUMANE SOCIETY OF SONOMA COUNTY’s funders (the co-funder graph). Top 30 of 84 funders by total. Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
HUMANE SOCIETY OF SONOMA COUNTY has a broad base — no single funder exceeds 16% of grant income, and it takes 5 funders to reach half.
the vertical line marks half of all grant income — 5 funders to its left
77% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund HUMANE SOCIETY OF SONOMA COUNTY.
Largest funder’s share by year: 2017 18% · 2018 34% · 2019 30% · 2020 29% · 2021 21% · 2022 20% · 2023 56% — growing more concentrated.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How long its funders stay
35% of HUMANE SOCIETY OF SONOMA COUNTY's funders are still giving 3 years after their first grant; 52% give in more than one year at all.
Share of funders still giving k years after their first recorded grant, pooled across every acquisition cohort. A funder counts as retained in a year only if it made a grant that year. Measured to FY2023, the last fiscal year that has finished arriving — a funder cannot be counted as lapsed in a year most filers have not reached.
Where its funders are
63% of HUMANE SOCIETY OF SONOMA COUNTY's grant income arrives through donor-advised or pass-through sponsors, whose addresses record where the money is held rather than where the donor is. Of the $1.5M that is directly attributable, 53% of it comes from California funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $2.6M arriving through sponsors registered in 12 states is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Against its field
HUMANE SOCIETY OF SONOMA COUNTY receives grants from 84 organizations whose IRS filings report $4.1M to it.
this organization peer median middle 50% of peers· 813 animals nonprofits $1M–$10M, FY2025
Organizations like HUMANE SOCIETY OF SONOMA COUNTY
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In California
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
74% of spending goes to programs.
Governance
Public support
90%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for HUMANE SOCIETY OF SONOMA COUNTY: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds HUMANE SOCIETY OF SONOMA COUNTY?
- HUMANE SOCIETY OF SONOMA COUNTY (California) receives grants from 84 organizations whose IRS filings report $4,097,503 to it, the largest being NATIONAL PHILANTHROPIC TRUST ($673,150). 44 of them have funded it in more than one year, and 63% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does HUMANE SOCIETY OF SONOMA COUNTY have?
- IRS filings report 84 organizations giving $4,097,503 in grants to HUMANE SOCIETY OF SONOMA COUNTY, 44 of which have funded it in more than one year.
- Who is the largest funder of HUMANE SOCIETY OF SONOMA COUNTY?
- NATIONAL PHILANTHROPIC TRUST is the largest funder on record, with $673,150 in grants. The full list of funders is on this page.
- How can an organization like HUMANE SOCIETY OF SONOMA COUNTY find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in California. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Humane Society of Sonoma County →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2017–2025), and the filings of 84 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 22, 2026. What this page cannot tell you · view filing