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White Clay Watershed Association

Watershed Education and Protection for the White Clay Creek and its Tributaries.

Landenberg, PA EIN 237116453 · IRS Sign up to see website
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90
Integrity Assessment
Strong transparency
90/100 · methodology

About White Clay Watershed Association

Bacteria: Partnered with Stroud Water Research Center and Delaware Nature Society to continue sampling of the White Clay Creek for E. coli, fecal coliform, and enterococcus at 30 sites (20 in PA/10 in DE) during the recreational season. Community fingerprinting, qPCR, and high frequency super sequencing were performed on select samples to determine the microbial sources present at detectible concentrations. Provided this data to both state's regulatory agencies, PADEP and DNREC. Municipal Outreach: The CWMP is a collaboration among watershed conservation organizations, county agencies, and municipalities. The over-arching mission of CWMP is to facilitate and support engagement and collaboration of municipalities, landowners and other stakeholders to restore and protect the water quality of streams in the Brandywine Creek, Red Clay …

Founded
Headquarters
Landenberg, PA
Foundation type
Supporting organization (509(a)(3))
IRS subsection
501(c)(03)
Ruling date
Size
small

Verified certifications

Confirmed against the issuing authority - not self-reported.

IRS Tax-Deductible since 1971

Mission

Watershed Education and Protection for the White Clay Creek and its Tributaries.

Focus areas & reach

· What they work on and where
🌿 Environment
Cause tags

How it stacks up against peers

· vs. 8 similar environment in United States
Program spending This charity: 84%
Peer average: 93%
CEO comp as % of revenue This charity: 19.13%
Peer average: 0.48%
Integrity Assessment This charity: 90
Peer average: 91

Red flags

· 1 item
High Executive Pay
Top executive compensation is 19.4% of total expenses ($74,368 of $382,556).

Where every $1 goes

$0.84
Program expenses$0.84 ($283,413)
84% to programs beats the Charity Navigator "highly efficient" threshold (75%).

Common questions

· Auto-generated from filings + methodology

White Clay Watershed Association is a registered environment nonprofit based in Landenberg, PA, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 1965 and has been operating for 61 years. Its EIN is 237116453. It has a GiveRadar Integrity Assessment of 90/100 (Strong transparency), indicating well-documented governance, financials, and contact details. The organization reports $389K in annual revenue. 71 officers and directors are publicly disclosed. GiveRadar has identified 1 potential concern.

White Clay Watershed Association 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 84% of expenses to programs, which contributes positively to its score. For comparison, the average integrity assessment for environment charities in United States is 91/100.

White Clay Watershed Association is located in Landenberg, PA, United States. The organization was established in 1965 and has been active for 61 years.

Based on official tax filings, White Clay Watershed Association has $389K in annual revenue. It allocates 84% of expenses to programs and services. This is below the average of 93% for environment charities in United States. Its revenue is below the peer average of $2M. Create a free GiveRadar account to view the complete financial breakdown with year-over-year trends.

White Clay Watershed Association is classified as a Environment organization, registered in United States. It operates as a Supporting organization (509(a)(3)). By size, it is categorized as a small organization. It has $389K in annual revenue. The organization has 71 disclosed officers and directors.

GiveRadar has identified 1 potential concern for White Clay Watershed Association. Red flags are automatically detected from official data and may include high executive compensation relative to budget, low program spending, or missing financial filings. Red flags do not necessarily mean wrongdoing but indicate areas that may warrant further review before donating.

White Clay Watershed Association has a GiveRadar Integrity Assessment of 90/100 (Strong transparency), which suggests it is a well-documented organization. It is regulated by the IRS. 84% of expenses go to programs. The peer average is 93%. Visit the White Clay Watershed Association profile on GiveRadar for full details before deciding. GiveRadar provides data for research purposes and does not endorse any organization. Always do your own due diligence.

Bacteria: Partnered with Stroud Water Research Center and Delaware Nature Society to continue sampling of the White Clay Creek for E. coli, fecal coliform, and enterococcus at 30 sites (20 in PA/10 in DE) during the recreational season. Community fingerprinting, qPCR, and high frequency super sequencing were performed on select samples to determine the microbial sources present at detectible concentrations. Provided this data to both state's regulatory agencies, PADEP and DNREC. Municipal Outreach: The CWMP is a collaboration among watershed conservation organizations, county agencies, and municipalities. The over-arching mission of CWMP is to facilitate and support engagement and collaboration of municipalities, landowners and other stakeholders to restore and protect the... White Clay Watershed Association is classified as a environment organization registered in United States. The organization was founded in 1965.

Among environment charities registered in United States: White Clay Watershed Association's GiveRadar Integrity Assessment of 90/100 is in line with the peer average of 91/100. It allocates 84% of expenses to programs, below the peer average of 93%. Its annual revenue of $389K is below the peer average of $2M.

Yes, donations to White Clay Watershed Association are generally tax-deductible in the United States. White Clay Watershed Association is a 501(c)(3) tax-exempt organization. Its EIN is 237116453, 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.

Verified against 4 official sources, last refreshed .

Annual revenue
$100K-$1M
84% to programs
Source: IRS 990 (FY2025) why this matters
Unlock exact figures

Filing history

6 years on file from IRS 990 (FY2025): revenue, expenses, program spending, assets, and liabilities by fiscal year.

Years on record: FY2025, FY2024, FY2023, FY2022, FY2021, FY2020.
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Taxes

Tax-deductibility for donors

Donations may be tax-deductible for residents of United States under local rules. Confirm with the charity directly.

Always confirm tax treatment with the charity directly or your tax advisor before donating.

Leadership

TH
Thomas Zawislak
President

Officers & trustees (20)

Source: Public filings

AN
Andrea S W••••••
Secretary
BR
Brian R••••••
Chair, Friends of the Lyceum
CA
Carolyn B•••••
Chair, Friends of the New Garden Trails
CA
Carrie B•••••
Chair, Friends of the New Garden Trails
DA
David H•••
Treasurer
DA
David R H•••
Treasurer
DO
Don P•••••
PA Co-Chair, WCCWMC
DO
Douglas J•••••
Board Member
ED
Edward J O••••••••
Delaware Co-Chair, WCCWMC
GA
Gary S••••••••
Board Member
JE
Jennifer E•••
Board Member
JU
Judy S•••••
Board Member
KR
Kristen T••••••
Board Member
LI
Linda S•••••••••
Board Member
MA
Martin W••••
Vice-President
SC
Scott G••••
Board Member
SH
Shane M•••••
Program Director WCCWMC
TE
Teddi S•••••
Board Member
TH
Thomas A Z•••••••
President
TH
Thomas Z•••••••
President
Full names, contact details & compensation

Free with an account.

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Latest news

From global news sources

No recent news coverage found

News coverage will appear here when articles mention this organization.

Activity timeline

Filings and press mentions, merged

Form filed
$0.4M revenue
FY2025
IRS_990
Form filed
$0.3M revenue
FY2024
IRS_990
Form filed
$0.4M revenue
FY2023
IRS_990
Form filed
$0.3M revenue
FY2022
IRS_990
Form filed
$0.2M revenue
FY2021
IRS_990
Form filed
$0.1M revenue
FY2020
IRS_990

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Peer charities

Other environment in United States, by integrity assessment

Charity Score Revenue Program %
White Clay Watershed Association This page 90 $388,718 84%
Baduwat Watershed Council 93 $426,600 100%
Birds of Prey Foundation 93 $396,950 82%
Keep Nassau Beautiful Inc 93 $296,240 81%
California Irrigation Institute Inc 90 $108,053 100%
Trout Unlimited 90 $771,789 96%
Association of New Jersey Recyclers Inc 90 $292,455 88%
Rochester Ecology Partners Inc 90 $444,787 94%
Rooted in Cheyenne 90 $171,328 100%

Sources and verification

Refreshed

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 - 71 disclosed in the public registry.
Supplementary verification
Charity Navigator

Data freshness

Last updated
May 27, 2026
Profile completeness
90%

What we don't know

Honest gaps - our score reflects transparency, not impact

Programs & projects
No named programs listed by the charity
Operating reach
Countries where programs run not specified

Methodology

GiveRadar combines public registry filings, ProPublica Nonprofit Explorer, Charity Navigator, GuideStar, and news archives into a single 0-100 integrity assessment. We don't take a cut of any donation, ever.

Read full methodology

Quick facts about White Clay Watershed Association

What is White Clay Watershed Association?
White Clay Watershed Association is a environment supporting organization (509(a)(3)) based in Landenberg, United States. Bacteria: Partnered with Stroud Water Research Center and Delaware Nature Society to continue sampling of the White Clay Creek for E. coli, fecal coliform, and enterococcus at 30 sites (20 in PA/10 in DE) during the recreational season. Community fingerprinting, qPCR, and high frequency super sequencing were performed on select samples to determine the microbial sources present at detectible concentrations. Provided this data to both state's regulatory agencies, PADEP and DNREC. Municipal Outreach: The CWMP is a collaboration among watershed conservation organizations, county agencies, and municipalities. The over-arching mission of CWMP is to facilitate and support engagement and collaboration of municipalities, landowners and other stakeholders to restore and protect the water quality of streams in the Brandywine Creek, Red Clay Creek and White Clay Creek watersheds. Ellen Kohler from the University of Maryland Environmental Finance Center was contracted to assist the White Clay Watershed Association as the lead coordinator of the multi-municipal collaboration of townships and boroughs in the White Clay watershed. CWMP provides technical assistance and planning support to municipalities, and advance understanding of watershed needs, and opportunities vis a vis regulatory requirements. We also provide regulatory liaison and unified representation, coordination and communication with regulatory agencies. This year we also offered a two training workshops to municipal public works employees and engineers on green infrastructure and their MS4 permits. Water Quality Improvement: Project administration and implementation, and planning for future projects. Implemented a 1030 square foot rain garden in Harmony Park, West Grove, PA. Conducted landowner outreach on a 5.5 acre riparian buffer planting on private land in Franklin Township and applied for grant funding to implement it. Attended several planning meetings regarding dam removals in White Clay with National Park
When was White Clay Watershed Association founded?
White Clay Watershed Association was founded in 1965.
Who leads White Clay Watershed Association?
Thomas Zawislak serves as President.
Where is White Clay Watershed Association located?
Headquartered in Landenberg, United States.
What is White Clay Watershed Association's annual budget?
Annual revenue for fiscal year 2025 is approximately $100K-$1M. 84% of expenses go to program services.
Is White Clay Watershed Association trustworthy?
White Clay Watershed Association 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 White Clay Watershed Association's registration number?
IRS EIN: 237116453.
What is White Clay Watershed Association's website?
http://whiteclay.org