SOLD OUT: Full Moon Hike at the Refuge

July 23 at 7:30 pm
Sorry, this popular hike is sold out. If you would like to be added to the waitlist, please email   July's Full Moon is known as the "Buck Moon"…

Mid Summer Paddle - Afternoon

July 25 at 4:30 pm
Please email if you need to cancel, or to be placed on a waitlist Mid Summer Paddle: 4:30 - 6:00 pm Come out and enjoy the sights along the…

Mid Summer Paddle - Evening

July 25 at 6:30 pm
Please email if you need to cancel, or to be placed on a waitlist Mid Summer Paddle: 6:30 - 8:00 pm Come out and enjoy the sights along the…

All Upcoming Events

From hikes to educational workshops, GSWA offers a wide variety of environmentally focused programs. We'd love to have you join us at an upcoming event!
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Land Stewardship

GSWA receives national accreditation and is one of only eight New Jersey groups to achieve this designation! GSWA’s vision supports the protection, preservation and promotion of NJ’s open spaces.

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Things to See and Do

From hiking & biking, to horseback riding & kayaking, there are countless outdoor activities to enjoy in this area. What’s your adventure today in New Jersey’s great outdoors?


Eco-Friendly Living

Every individual home has an effect on non-point source pollution in our watershed. Use our interactive home guide to lean how you can minimize your impact and help keep our watershed healthy.



The Riverkeepers are the primary voice using the advocacy model to stand up for clean waterways. GSWA is proud to be the Passaic River Waterkeeper Alliance Affiliate, protecting the source to sea.

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Featured Programs


In-School Education

GSWA is dedicated to teaching the younger generations about their impact on the watershed and river. Every year, we reach over 3,000 students through our in-school programming.


Water Quality

Every year, we publish a Water Quality Report Card about the prior year to help inform the public about the data we collect and the issues our watershed faces.

Report Card

New GSWA Video

The Passaic: One River, One Community

The Passaic: One River, One Community

Watch our new, 4-minute video that takes you on a journey down the Passaic River from its headwaters in Mendham to Newark Bay where the river meets the sea. Learn more about what we do, how we do it, and why we do it.
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CMA sign

1 Tiger Lily Lane, Harding Township, NJ

An ecological gem, preserved from deer and invasive species.
You are invited to explore our Conservation Management Area (CMA), a wooded 73-acre natural area in Harding Township. Its 3.5 miles of boardwalk and mulched trails are open to the public…
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2022 Spring Newsletter Cover3

GSWA Spring 2024 Newsletter

In This Issue: GSWA Joins Congresswoman Sherrill to Advocate for Native Plant Legislation, GSWA Acknowledges Longtime Partnership with the PSEG Foundation, Board of Trustee Updates, Upcoming Programs and Events, GSWA Water Quality Report Card…
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GSWA Partner Events


GSWA Partner Events

GSWA and its partners in the historic Great Swamp watershed region extend an invitation to explore an array of engaging environmental education and recreational activities within the area. Use the button below to read more to find event listings from these local organizations. For GSWA’s events, use the link located at the top of this page.
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