Snow Moon Hike

February 25 at 5:30 pm
There is no such thing as bad weather, only bad clothes. So no more excuses! It's time to bundle up, get back outside, and feel the rejuvenating power of nature…

Pollinator Conservation: Creating and Protecting Habitat for NJ’s Bees, Butterflies, and Biodiversity

March 13 at 7:00 pm
Pollinators and other beneficial insects are experiencing drastic and widespread declines making pollinator conservation a national and New Jersey priority. However, we can all play a role in protecting pollinators…

Pollinator Box Workshop

March 14 at 6:00 pm
  Did you know some bees don’t live in hives? Come get the scoop about pollinator boxes and how they benefit the environment. This workshop will be “the bee’s knees!”…

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 Fall 2023 Newsletter

In This Issue: Volunteerism-Empowering Positive Change at GSWA, Insects of the Swamp, From the Desk of the Executive Director, Paddling on the Passaic, Board of Trustees Updates, How a Rapidly Warming Climate Affects our Water Systems, Pledge to Build a Healthier Environment One Yard at a Time…
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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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