Silent Auction & Gala Tickets

October 5 at 6:00 pm
Our Silent Auction is Live! To Browse, Bid & Donate CLICK HERE  GSWA Gala Celebration & Silent Auction Brooklake Country Club | 139 Brooklake Road | Florham Park Join us…

Geocaching 101

October 16 at 6:00 pm
What is geocaching? Geocaching is a “location-based game” that combines the internet and satellite technology by using any smart phone or GPS to locate hidden containers called “geocaches” These “caches”…

Halloween Full Moon Hike

October 30 at 6:00 pm
When the Hunter’s full moon (named because it was the ideal time for hunting in the olden days) and Halloween collide, what’s better than a nighttime hike around the darkness…

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 2023 Newsletter

CONDO Development Plan may Significantly DEGRADE our GREAT SWAMP WATERSHED Conservation Management Area. By Hazel England, Director of Education & Outreach, Land Steward. Great news! You CAN make a difference! Access the March 9 hearing details at
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GSWA Partner Events


GSWA Partner Events

GSWA and its partners in our historic watershed and across the Passaic River region are excited to provide you with a listing of free-to-the-public environmental events happening locally. For inclusion, please contact
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