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REEF GUARDIANS HAWAII

EIN 47-3975420 PRINCEVILLE, HI

Revenue 2024
$200,868
Expenses 2024
$138,079

Program services were 81.5% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
C32
Classification
1200
Street
3737 KAWEONUI RD

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Mission and programs · 2024

Mission

Reef Guardians' mission is reef preservation through research, restoration, and education.

Activities or mission (Part I)

Reef Guardians' mission is reef preservation through research, restoration, and education. We raise awareness of the value of the marine environment, create environmental solutions, facilitate restoration, and educate tomorrows advocates and stewards.

  • EDUCATION - REEF GUARDIANS EDUCATES THE COMMUNITY AND BUILDS AWARENESS ABOUT CORAL REEF THREATS AND THE IMPORTANCE OF PROTECTING THE REEF, WETLANDS AND NEARSHORE ENVIRONMENTS. REEF CAMP, REEF GUARDIANS UNIQUE YOUTH ENVIRONMENTAL EDUCATION PROGRAM, OPERATES SCHOOL FIELD STUDY AND SCHOOL BREAK PROGRAMS. SERVING OVER 300 CHILDREN AGES 8-13 IN 2024, THE WEEKLY CAMPS PROVIDED INSTRUCTION IN SCIENCE, ARTS, HAWAIIAN CULTURAL KNOWLEDGE AND WISDOM, AND DIRECT LEARNING EXPERIENCES IN THE OCEAN ENVIRONMENT. REEF GUARDIANS HAWAII DEVELOPED AND IS DISTRIBUTING THE "HAWAII SEALIFE" APP, A FREE IOS/ANDROID TOOL DESIGNED FOR CHILDREN AND FAMILIES TO RAISE ENVIRONMENTAL AWARENESS AND PROMOTE RESPECTFUL, PROTECTIVE INTERACTIONS WITH HAWAIIS SHORELINES AND REEFS. THIS ANIMAL IDENTIFICATION APP OFFERS ENGAGING EDUCATIONAL CONTENT TO HELP USERS TO APPRECIATE AND SAFEGUARD THE NATURAL ENVIRONMENT.REEF GUARDIANS LAUNCHED AN EXTENSIVE ENVIRONMENTAL EDUCATION INITIATIVE IN 2024 CALLED THE "KE KULA KAI ONLINE SEA SCHOOL." THIS PROGRAM BUILDS ON OUR REEF CAMP CURRICULUM, COVERING 15 KEY TOPICS TO DEEPEN UNDERSTANDING OF OCEAN ECOLOGY AND THE HAWAIIAN ISLANDS. EACH TOPIC COMBINES OCEAN SCIENCE, CONSERVATION, AND HAWAIIAN CULTURAL KNOWLEDGE TO FOSTER ENVIRONMENTAL AWARENESS AND ENCOURAGE MEANINGFUL CONNECTIONS TO PLACE, AS AN EXTENTION OF OUR REEF CAMP AND HAWAII SEALIFE APP.THROUGH OUR COMMUNITY/GOVERNMENT PARTNERSHIP WITH THE CALIFORNIA DEPT. OF FISH AND WILDLIFE, REEF GUARDIANS PROVIDED AND INSTALLED EDUCATIONAL SIGNAGE AT HARBORS AND BEACHES, PROTECTING SHARKS IN THEIR NATURAL NEAR-SHORE FEEDING AREAS. REEF GUARDIANS IS REPLACING AND INSTALLING NEW SIGNS WHERE NEEDED. REEF GUARDIANS HAWAII PUBLISHED A COMPREHENSIVE STUDY ON LAND-BASED POLLUTION IMPACTING KAUA'I'S ?ANINI (WANINI) LAGOON. THIS REPORT, ALONG WITH ACTION STEPS TAKEN, WAS MADE AVAILABLE TO THE COMMUNITY, GOVERNMENT, AND NON-PROFIT AGENCIES THROUGH PUBLIC EVENTS AND FOR DOWNLOAD ON THE REEF GUARDIANS HAWAI'I WEBSITE. ADULT EDUCATIONAL EVENTS WERE HELD ACROSS KAUA'I AND IN SANTA BARBARA BY REEF GUARDIANS, WITH PARTICIPATION FROM CORAL AND SHARK EXPERTS, TO INCREASE PUBLIC AWARENESS AND PROMOTE ENVIRONMENTALLY PROTECTIVE ACTIONS.

    Expenses $83,381 · Revenue $102,417

  • RESEARCH AND MONITORING:- FOUR AREAS OF RESEARCH AND MONITORING CONDUCTED DURING THIS YEAR: STUDY OF LAND-BASED OCEAN POLLUTION ON KAUA?I FOCUSED ON WATER QUALITY IN ANINI LAGOON, WAILE?IA STREAM (PRINCEVILLE), AND MOLOA?A BAY. IN 2023, REEF GUARDIANS HAWAII PUBLISHED AN EXTENSIVE REPORT WITH RECOMMENDED ACTIONS. IN 2024, WE INITITED A COLLABORATIVE COMMUNITY-BASED WATER QUALITY TESTING PROGRAM TO CONTINUE RESEARCH AND INFORM REMEDIATION AND RESTORATION.OUR MONITORING OF JUVENILE WHITE SHARKS IN CALIFORNIA LED TO AN EXTENDED COMMUNITY/GOVERNMENT PARTNERSHIP PROTECTING SHARKS IN THEIR NATURAL NEAR-SHORE FEEDING AREAS. OUR DRONE MONITORING OF LEAKING OFF-SHORE OIL WELLS IN CALIFORNIA CONTRIBUTED TO A PARTNERSHIP PLANNING STUDY WITH A MULTI-AGENCY TEAM FUNDED TO ADDRESS THE LEAKING OIL WELL HEADS IN THE SANTA BARBARA AREA. OUR MONITORING OF KAUA?I'S OCEAN REEFS ASSISTED THE HAWAII STATE DIVISION OF AQUATIC RESOURCES IN REMOVING NON-NATIVE SPECIES IDENTIFIED AS POTENTIALLY NEWLY INTRODUCED INVASIVE SPECIES OF HIGH CONCERN.

    Expenses $29,211 · Revenue $48,679

As filed on the 2024 return.

Officers and directors · 2024

As listed in Part VII of the 2024 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • ROBIN MAZOR

    Exec Direct/Sec

    Total calculated
    $71,417
    From this org
    $71,417
    From related orgs
    $0
    Other
    $0
    Hours/week
    40

  • THOMAS WOODS

    President

    Total calculated
    $0
    Hours/week
    4

  • HARRY RABIN

    Vice President

    Total calculated
    $0
    Hours/week
    10

  • JAN HASHIZUME

    Treasurer

    Total calculated
    $0
    Hours/week
    1

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $200,868
    Expenses
    $138,079
    Contributions
    $169,295
    Grants paid
    $0
  • 2023
    Revenue
    $129,367
    Expenses
    $120,517
    Contributions
    $102,731
    Grants paid
    not reported
  • 2022
    Revenue
    $109,069
    Expenses
    $125,665
    Contributions
    $74,233
    Grants paid
    not reported

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

  • 2021 · 990-EZ

    Revenue
    $182,706
    Expenses
    $135,455
    Assets (EOY)
    $137,302

  • 2020 · 990

    Revenue
    $204,128
    Expenses
    $169,668
    Assets (EOY)
    $87,360

  • 2019 · 990-EZ

    Revenue
    $72,613
    Expenses
    $37,545
    Assets (EOY)
    $52,900

Nonprofiteer parses Forms 990, 990-EZ and 990-PF, in a window of recent tax years. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all.

Form 990-N e-Postcard, tax year 2018

Tax period
1 January 2018 to 31 December 2018
Principal officer
Robin Mazor
Mailing address
3737 Kaweonui RoadPrinceville HI 96722

As filed, from the IRS e-Postcard file of 26 October 2026. The IRS publishes only each organization's most recent postcard, so earlier years are not shown. A 990-N carries no financial detail. The postcard also gives the principal officer's address, which is not shown here.

Grants made

No itemized grants to organizations. Schedule I is filed only by organizations that granted more than $5,000 to a recipient, so most filers have none.

Grants received

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 13 October 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 13 October 2026 and read 26 October 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.