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PARTNERSHIP FOR THE DELAWARE ESTUARY INC

EIN 51-0375307 WILMINGTON, DE

Largest nonprofits in Delaware

Revenue 2024
$4,558,416
Expenses 2024
$4,160,205

Program services were 74.8% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
C30
Classification
1000
Street
110 S POPLAR ST STE 202

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

PARTNERSHIP FOR THE DELAWARE ESTUARY, INC. (PDE), HOST OF THE DELAWARE ESTUARY PROGRAM, LEADS COLLABORATIVE, SCIENCE-BASED EFFORTS TO IMPROVE THE DELAWARE RIVER AND BAY, WHICH COVERS PORTIONS OF DELAWARE, NEW JERSEY, AND PENNSYLVANIA.

  • LIVING SHORELINES - PDE CONTINUED TO CONDUCT STUDIES TO BETTER UNDERSTAND THE FRESHWATER MUSSEL HABITAT REQUIREMENTS THAT IMPROVE LIVING SHORELINE DESIGNS, AND CONTINUED TO WORK ON LIVING SHORELINE PLANNING, INSTALLATION, AND MONITORING. THIS INCLUDED LIVING SHORELINE MONITORING AT LEWES, DE; MISPILLION, DE; AND MAURICE RIVER, NJ; AS WELL AS ON THE SCHUYLKILL RIVER IN PHILADELPHIA. BIVALVE RESEARCH AND FRESHWATER MUSSEL PROPAGATION - PDE CONDUCTED FRESHWATER MUSSEL GENETIC RESEARCH AND FRESHWATER MUSSEL GROWTH RESEARCH AT SEVERAL LOCATIONS ACROSS PA, DE, AND NJ. PDE IS ALSO CONTINUING TO WORK TOWARD THE START OF CONSTRUCTION OF THE FRESHWATER MUSSEL HATCHERY. WETLANDS MONITORING AND ASSESSMENT - PDE CONDUCTED WETLANDS MONITORING AND ASSESSMENT AS PART OF THE MID-ATLANTIC COASTAL WETLANDS MONITORING AND ASSESSMENT (MACWA) PROGRAM. MACWA ACTIVITIES INCLUDED SITE SPECIFIC INTENSIVE MONITORING (SSIM), AS WELL AS GROUNDWATER MONITORING AT SITES IN NJ AND DE TO ASSESS THE IMPACTS OF CLIMATE CHANGE AND SEA LEVEL RISE. THE USE OF NEWLY ACQUIRED ACOUSTIC MONITORING EQUIPMENT IS ALSO BEING INCORPORATED INTO MONITORING AT RESTORATION SITES TO ASSESS THE CHANGE IN WILDLIFE USAGE PRE- AND POST-RESTORATION. PUBLIC ENGAGEMENT - PDE STAFF ENGAGED IN COMMUNITY OUTREACH RELATED TO CLEAN WATER, HEALTHY HABITATS, AND STRONG COMMUNITIES. PDE PARTICIPATED IN AN INCREASED THE NUMBER OF PUBLIC EVENTS AND FESTIVALS IN 2024, PROVIDING PDE WITH MORE OPPORTUNITIES TO ENGAGE WITH PEOPLE FACE-TO-FACE. IN ADDITION TO IN-PERSON EVENTS, PDE REACHED COMMUNITIES THROUGH VARIOUS SOCIAL MEDIA PLATFORMS AND PDE'S ESTUARY NEWS NEWSLETTER. URBAN WATERS FEDERAL PARTNERSHIP COORDINATION - PDE SERVED AS THE COORDINATOR OF THE URBAN WATERS FEDERAL PARTNERSHIP (UWFP) FOR THE DELAWARE RIVER LOCATION, WHICH INCLUDES THE CITIES OF PHILADELPHIA (PA), CHESTER (PA), CAMDEN (NJ), AND WILMINGTON (DE). PDE STENGTHENED CONNECTIONS WITHIN EACH OF THESE COMMUNITIES AND WORKED WITH COMMUNITY GROUPS TO PLAN COMMUNITY PROJECTS THAT WILL HELP IMPROVE WATER QUALITY, HABITAT, AND CLIMATE RESILIENCE.

    Expenses $3,109,863

As filed on the 2024 return. The filer continues this part on Schedule O, which is not shown here.

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.

  • Kathy Klein

    EXECUTIVE DI

    Total calculated
    $155,595
    From this org
    $150,359
    From related orgs
    $0
    Other
    $5,236
    Hours/week
    35

    Schedule J breakdown matched by us

    Base
    $150,359
    Bonus
    not reported
    Other
    not reported
    Deferred
    $5,236
    Nontaxable benefits
    not reported
    Filer's total
    $155,595
  • Elizabeth Horsey

    DEVELOPMENT

    Total calculated
    $115,597
    From this org
    $103,668
    From related orgs
    $0
    Other
    $11,929
    Hours/week
    35
  • Martha Maxwell-Doyle

    PROGRAM DIRE

    Total calculated
    $115,237
    From this org
    $103,450
    From related orgs
    $0
    Other
    $11,787
    Hours/week
    35

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. A Schedule J breakdown is as filed: base pay, bonus, other, deferred compensation and nontaxable benefits from this organization, with any from related organizations beside each, and the filer's own total. It is shown with the Part VII listing of the same name on the same return. The form gives no key between the two, so that pairing is ours, and is marked matched by us. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $4,558,416
    Expenses
    $4,160,205
    Contributions
    $4,481,950
    Grants paid
    $0
  • 2023
    Revenue
    $3,784,340
    Expenses
    $3,353,077
    Contributions
    $3,645,590
    Grants paid
    $0
  • 2022
    Revenue
    $3,346,234
    Expenses
    $3,120,392
    Contributions
    $3,276,249
    Grants paid
    $0

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

    Revenue
    $2,653,652
    Expenses
    $2,549,588
    Assets (EOY)
    $2,108,208
  • 2020 · 990

    Revenue
    $2,628,822
    Expenses
    $2,562,845
    Assets (EOY)
    $2,175,000
  • 2019 · 990

    Revenue
    $2,630,511
    Expenses
    $2,682,161
    Assets (EOY)
    $1,878,892
  • 2018 · 990

    Revenue
    $2,498,345
    Expenses
    $2,436,028
    Assets (EOY)
    $2,114,273
  • 2017 · 990

    Revenue
    $2,901,529
    Expenses
    $3,061,538
    Assets (EOY)
    $2,067,489
  • 2016 · 990

    Revenue
    $2,740,437
    Expenses
    $2,416,346
    Assets (EOY)
    $2,153,741
  • 2015 · 990

    Revenue
    $2,052,076
    Expenses
    $1,969,087
    Assets (EOY)
    $1,728,399
  • 2014 · 990

    Revenue
    $2,020,593
    Expenses
    $1,966,552
    Assets (EOY)
    $1,625,904
  • 2013 · 990

    Revenue
    $2,048,040
    Expenses
    $1,931,448
    Assets (EOY)
    $1,606,406

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.

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 1 November 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.