Markham Arboretum Society
Public records show a registered, tax-exempt organization in good standing.
What it says it does
To support enhancement and maintenance of the International Garden at the City of Concord's Markham Nature Park and manage Community Gardens within the City of Concord.
- Income
- $157,134
- Spending
- $7,401
- Reserves
- Over 10 years of spending
- Largest source of income
- donations and private grants, 93%
Source: Form 990EZ for the year ending June 30, 2024, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Financial health
We do not score finances when yearly spending is very small or the return has too little detail. The ratios stop meaning much at that size.
Source: Form 990EZ for the year ending June 30, 2024, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Governance
This organization files the short tax form, which does not ask about boards, policies or audits. That is normal for a small charity and is not a mark against it.
Source: Form 990EZ for the year ending June 30, 2024, 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 (3)
- $3,296 spent. Maintenace of the International Garden at the City of Concord's Markham Nature Park. We support and coordinate the efforts of 8-12 Volunteers who work a half-day, weekly, throughout the year. The park and garden are visited by thousands of visitors annually.
- $95 spent. Manage the Markham Park Community Garden within the City of Concord, CA. Thirty plots are available for a small annual fee.
- Supporting the City's efforts to expand Community Gardens throughout the city. Working with one local group and developing procedures for locations in other city parks.
Source: Form 990EZ for the year ending June 30, 2024, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Legitimacy checks
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.
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 October 13, 2026.
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.
Is it keeping up with its IRS filings? Passed.
Most recent return on file covers the year ending June 2026.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.
How long has it been tax-exempt? Passed.
Recognized by the IRS since July 1982.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.
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 October 21, 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.