Mayor Bill de Blasio has postponed work to finish New York’s third water tunnel, a project that for more than half a century has been regarded as essential to the survival of the city if either of the two existing, and now aged, tunnels should fail.
The new tunnel has already been completed and is carrying water into Manhattan and the Bronx. But segments that would supply Brooklyn and Queens, home to five million people, though also virtually finished, still await the building of two deep shafts.
If calamity or age forced the shutdown of City Water Tunnel No. 2, which is 80 years old, the primary water supply to much of Brooklyn and Queens would be lost for at least three months, city engineers said, the time it would take for an emergency activation of the sections of Tunnel No. 3 in Brooklyn and Queens that have already been finished.
The entire Brooklyn-Queens leg of the new tunnel was scheduled to be finished by 2021, with $336 million included in the capital budget in 2013 by Mr. de Blasio’s predecessor, Mayor Michael R. Bloomberg, for whom completion of the third tunnel was the most urgent and expensive undertaking of his tenure.
But last year, Mr. de Blasio’s administration, eager to keep a lid on water and sewer rates that had grown by an average of 8 percent annually under Mr. Bloomberg, moved financing for the third tunnel to other projects, Amy Spitalnick, a de Blasio spokeswoman, said.
The city intends to finish the remaining portions of the tunnel sometime in the 2020s, but it has not set a date for completion nor allocated money in the budget to carry out the work. For the foreseeable future, the $6 billion tunnel will remain dry in the two largest boroughs, where well over half the city’s population lives.