Our Mission

Keeping water clean, safe and healthy is the heart of our mission. We work to protect and restore our water and natural environment in central New Jersey through conservation, advocacy, science, and education.

Our staff includes policy advocates, scientists, land and water stewards, naturalists and educators. We speak out for water and environment, protect and restore sensitive habitats, test our waterways for pollution and inspire others to care for the natural world. We focus our work in the Stony Brook-Millstone and the adjacent part of the Central Delaware River Watersheds.

As a non-profit organization we depend on the support of members and volunteers. Learn how you can help us protect central New Jersey’s water and environment.

Get Involved


From our nearly 1,000-acre Watershed Reserve in Hopewell to locations across the region, Watershed staff and volunteers work to protect and restore our natural habitats. The Reserve hosts the Watershed Center for Environmental Advocacy, Science and Education; the Kate Gorrie Butterfly House; the Honey Brook Organic Farm; 4-acre Wargo Pond and more than 10 miles of hiking trails.


For nearly seven decades, The Watershed Institute has led the fight to preserve our region’s water and land. We engage local and state officials, urging them to strengthen environmental protections, improve planning and zoning, and make more informed decisions about our future. We work cooperatively with local towns through our Project for Municipal Excellence, and speak out against development proposals that would harm the environment and our quality of life.

Science and Stewardship

Across the region, we collect key data on the health of our streams and on other environmental factors. We distribute the information to residents and public officials, and work with them to address pollution of our water supplies and waterways. Our GIS Center (Geographic Information System) combines scientific data with mapping systems to promote better understanding of the environmental issues facing our communities. Our “River-Friendly” program helps residents, schools, businesses and golf courses become better environmental stewards.


The Watershed Institute serves more than 10,000 children, teens and adults through more than 300 programs and events each year. Our experts teach environmental science through an inquiry-based, problem solving model. Watershed Nature Camp inspires an appreciation of nature in children from Kindergarten through 9th grade and our summer science & stewardship academy engages high school students in real-world environmental challenges. Adult programs tap college professors to provide in-depth learning on natural history and other topics.

What We’re Doing To Protect Water

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History of the ‘Shed’

In 1949 a handful of farsighted community leaders joined forces to form the Stony Brook-Millstone Watershed Association, now known as The Watershed Institute. Concerned at the time about agricultural runoff, soil erosion, and stream sedimentation, the Watershed Association became central New Jersey’s first environmental group.

Since that time, our focus has evolved. Today we protect clean water and the environment through a combination of conservation, advocacy, science and education. Thanks to the loyal support of our members and volunteers the Watershed Institute has grown into one of the largest and most respected watershed associations in the country.

Three important figures in Watershed Association history:

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