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

The Stony Brook-Millstone Watershed Association is central New Jersey's first environmental group, protecting clean water and the environment through conservation, advocacy, science and education.

We protect clean water and the environment in the 265-square-mile region of central New Jersey that drains into the Stony Brook and Millstone River. This region includes 26 towns in Mercer, Middlesex, Monmouth, Somerset and Hunterdon counties.

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 65 years of effective environmental protection.


Come visit our 930-acre Watershed Reserve to enjoy more than 10 miles of hiking trails, Wargo Pond, and the Stony Brook!