Elkhorn Slough Foundation
To conserve and restore Elkhorn Slough and its watershed, and to engage community members in ways that increase appreciation and motivates the perpetual protection and care of Elkhorn …
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Visit www.elkhornslough.orgAbout Elkhorn Slough Foundation
California's Elkhorn Slough and its watershed is a remarkable meeting place between land and sea.
Verified certifications
Confirmed against the issuing authority - not self-reported.
Mission
To conserve and restore Elkhorn Slough and its watershed, and to engage community members in ways that increase appreciation and motivates the perpetual protection and care of Elkhorn Slough.
Focus areas & reach
· What they work on and whereHow it stacks up against peers
· vs. 8 similar advocacy & civil rights in United StatesConcerns
· None foundWhere every $1 goes
GiveRadar Analysis
Original analysis from GiveRadar's dataset of comparable organizations
Based on the records currently verified by GiveRadar, Elkhorn Slough Foundation has a substantially complete profile, cross-referenced across 4 independent sources including the IRS.
- GiveRadar has cross-referenced this organization across 4 independent sources, led by the IRS - more than 96% of similar organizations. See the sources
- It has more complete contact information than nearly all similar organizations, with a verified website, email, phone and address on record. Compare with peers
- Its integrity score of 90 places it in the top 1% of the 127,988 advocacy & civil rights charities in the United States GiveRadar tracks, because GiveRadar has verified its financial disclosures and its governance. View this cohort
- government registration
- financial records
- disclosed leadership
- a website
- a contact email
- third-party accreditation
- a donation page
- an owner-submitted profile claim
Common questions
· Auto-generated from filings + methodologyElkhorn Slough Foundation is a registered advocacy & civil rights nonprofit based in Moss Landing, CA, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 1982 and has been operating for 44 years. Its EIN is 942823247. According to GiveRadar's records, it holds active tax-deductible status on the IRS Publication 78 list, which means donations are tax-deductible and the organization is in good standing with the IRS. GiveRadar's Integrity Assessment for the organization is 90/100, which reflects how much public information is available, not whether the charity is legitimate. The organization reports $9M in annual revenue. 43 officers and directors are publicly disclosed. No red flags have been detected.
Elkhorn Slough Foundation has a GiveRadar Integrity Assessment of 90/100. This score combines five components: Registration (20 pts), Financial Transparency (30 pts), Governance (20 pts), Contact Availability (10 pts), and Data Recency (20 pts), with negative adjustments for any red flags. A score of 90 ('Strong transparency') reflects well-documented governance, recent financials, named leadership, and working contact details. The charity allocates 75% of expenses to programs, which contributes positively to its score. For comparison, the average integrity assessment for advocacy & civil rights charities in United States is 90/100.
Elkhorn Slough Foundation is located in Moss Landing, CA, United States. The organization was established in 1982 and has been active for 44 years.
Based on official tax filings, Elkhorn Slough Foundation has $9M in annual revenue. It allocates 75% of expenses to programs and services. This is in line with the average of 80% for advocacy & civil rights charities in United States. Its revenue is significantly above the peer average of $4M. Create a free GiveRadar account to view the complete financial breakdown with year-over-year trends.
Elkhorn Slough Foundation is classified as an Advocacy & Civil Rights organization, registered in United States. It operates as a Publicly-supported charity (509(a)(2)). By size, it is categorized as a medium organization. It has $9M in annual revenue. The organization has 43 disclosed officers and directors.
No red flags have been detected for Elkhorn Slough Foundation. GiveRadar automatically screens charities for concerning patterns including high executive compensation, low program spending, and missing financial filings. Based on available official data, no issues have been identified.
According to GiveRadar's records, Elkhorn Slough Foundation holds active tax-deductible status on the IRS Publication 78 list, which means donations are tax-deductible and the organization is in good standing with the IRS. It is registered with the Internal Revenue Service (IRS). It reports that 75% of expenses go to programs (the peer average is 80%). GiveRadar provides data for research and does not endorse any organization. A GiveRadar Integrity Assessment reflects how much public data is available, not whether an organization is safe to donate to, so it is always smart to do your own research before giving.
California's Elkhorn Slough and its watershed is a remarkable meeting place between land and sea. Elkhorn Slough Foundation is classified as an advocacy & civil rights organization registered in United States. The organization was founded in 1982.
Among advocacy & civil rights charities registered in United States: It allocates 75% of expenses to programs, in line with the peer average of 80%. Its annual revenue of $9M is well above the peer average of $4M.
Yes, donations to Elkhorn Slough Foundation are generally tax-deductible in the United States. Elkhorn Slough Foundation is a 501(c)(3) tax-exempt organization. Its EIN is 942823247, which you can use for tax filing purposes. Donors can typically deduct contributions on their federal income tax return if they itemize deductions. Consult a tax professional for guidance specific to your situation.
Filing history
6 years on file from IRS 990 (FY2025): revenue, expenses, program spending, assets, and liabilities by fiscal year.
See 5 years of revenue, expense breakdowns, and balance sheet.
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Tax-deductibility for donors
Donations may be tax-deductible for residents of United States under local rules. Confirm with the charity directly.
ELKHORN SLOUGH FOUNDATION is registered in United States. Donations from the Netherlands to charities outside the EU/EEA are generally not tax-deductible for Dutch donors unless the charity is listed on the Dutch ANBI register with foreign-recognized status.
Always confirm tax treatment with the charity directly or your tax advisor before donating.
Staff & volunteers
From the latest filing
Leadership
Officers & trustees (14)
Source: Public filings
14 officers and trustees on file - free with a GiveRadar account.
Latest news
From global news sources
10 articles found
From global news sources
Sentiment
NeutralElkhorn Slough emerges as Big Sur’s quieter outdoor escape - MSN
Elkhorn Slough’s wildlife, conservation, and otter haven - MSN
Between San Jose And Paso Robles Is A California Coastal Preserve With Trails, Birdwatching, And Paddling - islands.com
Volunteer Helps With Monitoring Sea Otters in Monterey County - KQED
A retired Navy commander, a stakeout, and a new understanding of sea otters in Elkhorn Slough - 90.3 KAZU
The Elkhorn Slough Foundation names Taylor Honrath as its second-ever executive director. - Monterey County Weekly
Elkhorn Slough Foundation names new executive director - The Pajaronian
Eucalyptus removal project turns trees into biochar for farm research - Salinas Valley Tribune
Elkhorn Slough Foundation Executive Director to Step Down After 40 Years - TPG Online Daily
Moss Landing Battery Storage Facility Fire: Bay Area research team identifies toxic metals tied to explosion at Elkhorn Slough - ABC7 Bay Area
Activity timeline
Filings and press mentions, merged
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Sign up to write a reviewCause areas in United States
How many charities work in each area, with this charity's area highlighted.
Most common causes in United States
Causes charities work on most, with this charity's causes ticked.
Sources and verification
- Registration and legal identity
- Internal Revenue Service (IRS) - Tax Exempt Organization Search
- Financial filings
- IRS Form 990 filings - Fiscal year 2025 most recent on file.
- Officers and trustees
- Internal Revenue Service (IRS) - Tax Exempt Organization Search - 43 disclosed in the public registry.
- News and media coverage
- GDELT Project + Google News
- Supplementary verification
- Charity Navigator
Data freshness
What we know and don't know
Exactly which public data we hold on this charity. Our score reflects transparency, not impact.
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Financial data · FY2025 on record
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Named leadership · 43 officers on file
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Executive pay · Disclosed
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Government registration · Registered with an official registry
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Mission statement · Published
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Official website · On record
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Headquarters address · On file
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Direct contact · Email or phone published
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Tax-deductibility · Verified
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Founding date · 1982
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Programs & activitiesNo named programs listed by the charity
Methodology
GiveRadar builds each profile primarily from official government charity registries, supplemented where available by third-party nonprofit databases and news archives, and combines it into a single 0-100 integrity assessment. The exact sources for this charity are listed above. We don't take a cut of any donation, ever.
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Quick facts about Elkhorn Slough Foundation
- What is Elkhorn Slough Foundation?
- Elkhorn Slough Foundation is a advocacy & civil rights publicly-supported charity (509(a)(2)) based in Moss Landing, United States. California's Elkhorn Slough and its watershed is a remarkable meeting place between land and sea.
- When was Elkhorn Slough Foundation founded?
- Elkhorn Slough Foundation was founded in 1982.
- Who leads Elkhorn Slough Foundation?
- Mark Silberstein serves as Executive Director.
- Where is Elkhorn Slough Foundation located?
- Headquartered in Moss Landing, CA, United States.
- What is Elkhorn Slough Foundation's annual budget?
- Annual revenue for fiscal year 2025 is approximately $1M-$10M. 75% of expenses go to program services.
- Is Elkhorn Slough Foundation trustworthy?
- Elkhorn Slough Foundation has a GiveRadar Integrity Assessment of 90 out of 100 (Strong transparency). The score reflects public-data transparency: registration, financial disclosure, governance, contact details, and how recently data was refreshed. It does not measure program impact.
- What is Elkhorn Slough Foundation's registration number?
- IRS EIN: 942823247.
- What is Elkhorn Slough Foundation's website?
- http://www.elkhornslough.org/