May 5, 2025

Last Fall’s Historic Drought and Persistent Below Average Precipitation Patterns Added to Concerns About Moving Forward with Restarting the Project This Year

The New York City Department of Environmental Protection (DEP) today announced it will begin a new procurement and contracting process to make the final connection of a new bypass tunnel under the Hudson River as the last step in its $2 billion program to fix leaks in the Delaware Aqueduct. November’s pause of the project after the historic drought last fall ended the existing construction contract, forcing the final connection to be completed under a new procurement process. Given the need for a new contract, continued concerns about lower-than-average precipitation, and plans to upgrade pumps in the aqueduct, the final connection is not expected to be completed until after 2027.

“A new contract must take every contingency into account to ensure we meet our critical responsibility of providing the highest quality water possible to nearly 10 million New Yorkers every day, without exception,” said DEP Commissioner Rohit T. Aggarwala. “This final connection will allow us to continue fulfilling our vital mission for future generations.”

In 2010, New York City announced a plan to repair the leaking sections of the 85-mile Delaware Aqueduct, the longest tunnel in the world, by connecting a 2.5-mile-long bypass tunnel around leaks discovered in the 1990s deep under the Orange County Town of Newburgh adjacent to the Hudson River. The new bypass, being connected 600 feet beneath below the river’s surface, is the first tunnel built under the Hudson since 1957, when the south tube of the Lincoln Tunnel was completed. A separate smaller leak in the Ulster County Town of Wawarsing will also be repaired when the bypass connection is made.

Since 1992, DEP has continuously monitored the leaks, which can release upwards of 35 million gallons per day, the vast majority of which is through the leaks near the Hudson River in Newburgh.

The final bypass connection requires an eight-month shutdown and draining of the Delaware Aqueduct that would start in October of any given year because demand for water is at its lowest all year during the winter months.

DEP manages New York City’s water supply, providing approximately 1 billion gallons of high-quality drinking water each day to nearly 10 million residents, including 8.5 million in New York City. The water is delivered from a watershed that extends more than 125 miles from the city, comprising 19 reservoirs and three controlled lakes. Approximately 7,000 miles of water mains, tunnels and aqueducts bring water to homes and businesses throughout the five boroughs, and 7,500 miles of sewer lines and 96 pump stations take wastewater to 14 in-city treatment plants. DEP also protects the health and safety of New Yorkers by enforcing the Air and Noise Codes and asbestos rules. For more information, visit nyc.gov/dep, like us on Facebook, or follow us on X, formerly known as Twitter.