Your water. Your environment. Your voice.


The Stony Brook-Millstone Watershed Association is central New Jersey’s first environmental group. Since 1949 we’ve worked to protect your water and environment through conservation, advocacy, science and education. We speak out for your water and environment, protect and restore sensitive habitats, test our waterways for pollution and inspire others to care for and protect the natural world. Our goal is to improve the health and quality of central New Jersey’s water and sustain a network of protected habitats for wildlife and people. We have a successful track record of more than 60 years of effective environmental protection.

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

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.


From our 930-acre Watershed Reserve in Hopewell to locations across the region, Watershed Association staff and volunteers are engaged in projects that protect and restore our natural habitats. Our “River-Friendly” initiative helps residents, schools, businesses and golf courses become better environmental stewards. Our Watershed Reserve hosts the Honey Brook Organic Farm, more than 10 miles of hiking trails and Wargo Pond. Learn more…


For more than six decades, the Watershed Association 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 better 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 local environment and our quality of life. Learn more…


Science is at the heart of the Watershed Association’s environmental leadership. Across the region, we collect key data on the health of our streams and on other environmental factors. We distribute the information to citizens and officials in central New Jersey, 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 help local governments and citizens understand the environmental issues facing our communities and help plan for a better future. Learn more…


The Watershed Association serves more than 10,000 children and adults through nearly 400 education programs and events each year. Our programs inspire an appreciation of the wonders of nature and explain what we can all do to protect our environment. Our teacher workshops train educators to incorporate the environment into their curriculums, while adult education programs teach strategies to reduce the environmental impacts of your home and business. Learn more…



Spring Fling Mini-Camp

April 6-10, Monday - Friday, 9:30AM - 4:00PM each day, girls/boys 6-12 years old, Daily fee: $75M/$90NM

Spend your spring school break at the Watershed Reserve with the Teacher-Naturalists! We will hike the trails, perhaps visit the Stony Brook or Wargo Pond to search for signs of spring, build shelters in the woods and have an afternoon campfire each day! The new Watershed Center is 'home base' but we will spend every day outdoors. Register for one day or all week. Registration and pre-payment are required. Multi-day and sibling discounts and extended care are available.

Learn more!


Volunteer at the ‘Shed

Discover the many ways you can help at the Reserve. We have volunteer opportunities available in many different capacities. Are you good at event planning? Clearing trails? Conducting scientific research? Or are you looking for a corporate work day for you and your coworkers? Click here to learn more and complete a volunteer application..


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