A bird’s eye view of one of the many streams in PA, this one an unnamed tributary of the east branch of Codorus Creek near Winterstown in York County

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Our Impact

We strive for clean streams and rivers flowing through resilient landscapes, cared for by the people who live, work, and play in the Chesapeake Bay watershed.

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Trees planted along local streams and rivers

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Worth of stormwater management practices installed

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Farms in the Chesapeake Bay watershed supported

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Community scientists learned how to monitor water quality

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2026 Treelay – Save the Date

March 28, 2026

Help make a splash towards clean water and healthy communities by planting trees with the Alliance during Treelay! Read More >

Wild & Scenic Film Festival – MD

April 1, 2026

Save the date for the 2026 Wild & Scenic Film Festival in MD! Read More >

Two Alliance staff members smiling as they stand behind a table set up with Alliance logos and educational materials.

Wild & Scenic Film Festival – DC

April 8, 2026

Save the date for the 2026 Wild & Scenic Film Festival in DC! Read More >

Wild & Scenic Film Festival – PA

April 14, 2026

Save the date for the 2026 Wild & Scenic Film Festival in PA! Read More >

Find even more local events, volunteer opportunities, and job postings on the Chesapeake Network!

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Our Work

The Alliance brings together communities, companies, and conservationists to improve our lands and waters.

Forests

Agriculture

Green Infrastructure

Stewardship & Engagement

Latest Blogs

rows of young trees inside plastic tubes
Agriculture Uncovered: nature-based practices for farm and ecosystem resilience
Reduce Your Stormwater: Urban Trees
an aerial view of a coastal farm
Maryland Farms Receives “Living Shoreline”
two people paddle a canoe in front of a bridge
Dairy Farm Helps Clean Juniata County Waterways
two large buildings next to a residential neighborhood
Where the Cloud Meets the Coast
orange flowers and a person showing another what is growing in a garden
Baltimore Green Space Invests in Preserved Spaces in Baltimore City Communities
four people laugh while talking to each other
The Swansboro West Civic Association envisions a new green space for their community
rows of young trees inside plastic tubes
Agriculture Uncovered: nature-based practices for farm and ecosystem resilience
Reduce Your Stormwater: Urban Trees
an aerial view of a coastal farm
Maryland Farms Receives “Living Shoreline”
two people paddle a canoe in front of a bridge
Dairy Farm Helps Clean Juniata County Waterways
two large buildings next to a residential neighborhood
Where the Cloud Meets the Coast
orange flowers and a person showing another what is growing in a garden
Baltimore Green Space Invests in Preserved Spaces in Baltimore City Communities
four people laugh while talking to each other
The Swansboro West Civic Association envisions a new green space for their community

Make an impact.

For our forests. For our streams. For our future.

Donate Today

Photo courtesy of Chesapeake Bay Program