World’s Largest Unfiltered Water Supply: NYCs Catskill Watershed @TheDailyConversation
World’s Largest Unfiltered Water Supply: NYCs Catskill Watershed  @TheDailyConversation
Uploaded August 2026 | Updated September 2026, 2 weeks ago
Most New Yorkers turn on a faucet without thinking about where their water begins. About 90% of New York City’s drinking water comes from the Catskill and Delaware systems—the largest unfiltered water supply in the World.
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The water still receives disinfection, including UV treatment, but New York avoids conventional filtration by protecting the forests, streams, wetlands, farms, and reservoir lands that keep its source water clean.

Thanks to Jeff Senterman, Executive Director of the Catskill Center, a nonprofit protecting the Catskills' land, water, and communities since 1969. The Center is an accredited land trust, advocates for the Catskills, and runs the Catskills Visitor Center in Mount Tremper - home to hiking trails, a historic fire tower, and trip-planning resources.
catskillcenter.org
Visit: catskillsvisitorcenter.org
New York City watershed protection: dos.ny.gov/new-york-city-watershed-program
Hudson River School Art Trail: hudsonriverschool.org
NYC's new UV treatment: nyc.gov/html/dep/html/press_releases/13-104pr.shtml
The Landmark 1997 Watershed Agreement (MOA): nationalacademies.org/read/9677/chapter/1

Jeff's ties to the Catskills are personal as well as professional. He grew up spending weekends in the mountains, worked as an Assistant Forest Ranger, and has spent his life exploring the Catskills. He's also a licensed hiking guide who co-owns Hike On Guides with his husband, Moe - together known online as the Hiker Trash Husbands, sharing trail stories and promoting LGBTQ+ visibility in the outdoors. From policy work to hikes, it all comes from a lifelong love of the Catskills.
YouTube - youtube.com/@HikerTrashHusbands
hikertrashhusbands.com

I spent a morning with Jeff, at Ashokan Reservoir and around the Catskill Park. We explore the land conservation that protects New York City’s water; the communities flooded to create the reservoir; the gravity-fed tunnels that carry water toward the city; the partnership with local farmers and towns; and the remarkable public landscape that these overlapping layers of protection help preserve.

We then visit Platte Clove, where Hudson River School painters such as Thomas Cole imagined a wilder Catskills than the heavily logged and quarried landscape of their time—and where, more than a century later, much of the forest has returned.

Chapters:
00:00 New York City’s unfiltered water
00:42 Protecting the Catskills watershed
01:26 The towns beneath Ashokan Reservoir
02:03 Conservation versus filtration
03:11 The Catskill Park and “forever wild”
04:04 How water reaches the city
05:00 A model built with local communities
05:50 The landscape that inspired conservation
07:07 The forest returns

TDC Places explores the infrastructure, history, people, and decisions that shape remarkable places.

#TDCPlaces #Catskills #WaterInfrastructure

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TDC Places, TDC Places documentary, TDC documentary, how a place works, urban history, city history, infrastructure, architecture, engineering, civil engineering, urban planning, historic preservation, public works, hidden history, civic infrastructure, walking tour, local history, Catskills watershed, NYC water supply, New York City drinking water, Ashokan Reservoir, unfiltered water, watershed protection, Catskill Center, Jeff Senterman, Catskill Park
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World’s Largest Unfiltered Water Supply: NYC's Catskill Watershed

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