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Marin Open Space Trust

EIN 26-2460667 · San Rafael, CA

Public records show a registered, tax-exempt organization in good standing.

LegitimacyPassesRegistration and standingFinancial healthGood85 out of 100GovernanceStrong100 out of 100Impact evidenceDescribes programsHow well its results are evidenced

What it says it does

Raise funds to acquire, restore, and protect open space and park lands in Marin County, California, and negotiate acquisitions of lands and conservation easements

Income
$127,747
Spending
$86,850
Spent on programs
93%
Reserves
81.8 months of spending
Largest source of income
donations and private grants, 85%
Employees
0
Volunteers
7

Source: Form 990 for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Financial health

Good: 85 out of 100. Higher than 60% of charities in its peer group (environment, under $250k).

  • Reserves

    35 of 35

    Spendable reserves would cover 81.8 months of spending.

  • Debt

    20 of 20

    It owes 0% of what it owns.

  • Living within its means

    15 of 15

    Income exceeded spending by 32% of income.

  • Income trend

    0 of 15

    Income fell 91% on the year before.

  • Spending floor

    15 of 15

    93% of spending went to programs and raising each dollar of donations cost 0 cents.

Source: Form 990 for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Governance

Strong: 100 out of 100. Higher than 89% of charities in its peer group (environment, under $250k).

  • Independent board

    25 of 25

    7 of 7 voting board members are independent.

  • Conflict of interest policy

    15 of 15

    Has a written conflict of interest policy.

  • Whistleblower policy

    8 of 8

    Has a written whistleblower policy.

  • Record keeping policy

    7 of 7

    Has a written policy on keeping and destroying records.

  • Board minutes

    5 of 5

    Keeps minutes of board meetings.

  • Board sees the tax return

    10 of 10

    Gave the board a copy of this return before filing it.

  • No reported misuse

    10 of 10

    Reports no diversion of assets, excess benefits or loans to insiders.

Source: Form 990 for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Impact evidence

Describes programs. Its tax return describes what it does but we have found no measurable results in it.

Programs described in its return (4)
  1. $67,183 spent. Completed remaining expenses, including establishing a restoration fund, for the 100-acre Wall property open space in Fairfax, California. The property was turned over to the Town of Fairfax for ownership with Marin County Parks and Open Space assuming responsibility for trails.
  2. $8,365 spent. Entered into a purchase and sales agreement, for purchase of a 7-acre hilltop knoll in Fairfax, California and bordering the Town of San Anselmo. The site is contiguous with adjoining open space. When transactions are completed the property would become part of the Marin County Open Space District.
  3. $2,438 spent. Monitoring of three conservation easements owned by MOST along with protection work at the 135-acre San Geronimo Commons easement. Work on San Geronimo easement involved salmonid habitat enhancement and flood plain restoration.
  4. $2,804 spent. Memberships with affiliated groups including the California Council of Land Trusts Land Trust Alliance and Together Bay Area.

Source: Form 990 for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate

Legitimacy checks

  1. Is it registered with the IRS? Passed.

    Listed in the IRS master file of tax-exempt organizations as a 501(c)(3) charitable organization.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  2. Has the IRS revoked its tax-exempt status? Passed.

    Not on the IRS automatic revocation list.

    Source: Automatic revocation of exemption list, Internal Revenue Service, file dated November 6, 2026.

  3. Are donations tax-deductible? Passed.

    On the IRS list of organizations eligible to receive tax-deductible contributions.

    Source: Publication 78 data: organizations eligible for tax-deductible contributions, Internal Revenue Service, file dated October 13, 2026.

  4. Is it keeping up with its IRS filings? Passed.

    Most recent return on file covers the year ending December 2025.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  5. How long has it been tax-exempt? Passed.

    Recognized by the IRS since January 2010.

    Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.

  6. Is it in good standing with state regulators? Passed.

    Not on California's list of charities barred from soliciting. Other states are not yet checked.

    Source: May Not Operate or Solicit for Charitable Purposes list, California Attorney General, Registry of Charities and Fundraisers, file dated November 4, 2026.

Ratings and checks are our reading of public records, using the published method. They are not a statement about anyone's honesty. If you work for this organization, you can send corrections or results, confirm you want gifts through Veridonate, or ask to be removed from giving.