$46 million. That’s what the U.S. Navy has spent on the newest weapon in its decades-long fight against a toxic plume that’s been creeping under Nassau County since the days when Bethpage’s skies were thick with jet exhaust.
On March 31, Navy officials cut the ribbon on the Phase II Groundwater Treatment Plant off Union Avenue in Bethpage, the latest infrastructure built to fight contamination traced back to Northrop Grumman’s former aircraft manufacturing operation. The ceremony was the kind of thing local residents have waited a long time to see. Whether the wait was worth it depends on who you ask.
Here’s what taxpayers and water ratepayers are dealing with. The plume itself is enormous. More than 4 miles long. Nearly 2 miles wide. It reaches depths of 900 feet beneath Nassau County soil, carrying trichloroethylene and 1,4-dioxane through the ground beneath suburban neighborhoods. Long Island doesn’t have the luxury of switching to a backup water source, either. The region draws its supply from a sole-source aquifer, one underground reservoir serving nearly 3 million people with no real alternative. The Bethpage Water District has been fighting contamination impacts for years, and the costs keep climbing.
Construction on the Phase II plant broke ground in 2021. The facility is designed to pull up to 3 million gallons of contaminated groundwater per day through six deep recovery wells, run it through multiple treatment stages to strip out the chemicals, then return the cleaned water to the aquifer. Sounds clean and simple. It’s not, and it won’t be finished anytime soon.
The plant started partial operations last fall but went dark in December, according to the state Department of Environmental Conservation. It’s been running again for more than two months, with full capacity expected sometime this summer. That interruption didn’t get much attention at the time, and officials haven’t been particularly forthcoming about what caused it.
“Removing the remaining contamination will take many years because groundwater moves slowly deep underground,” said David Brayack, a project manager involved in the effort.
That’s the honest answer. Over 97% of the contaminated plume is now under what officials call active control, and more than 20% of total pollution has been removed since cleanup started more than 25 years ago. The Phase I system used a network of wells targeting the worst hot spots. The new Phase II plant extends that reach further south, chasing the plume as it migrates.
“This milestone reflects decades of sustained effort, scientific rigor and partnership with the Bethpage community,” said a Navy spokesperson at the ribbon-cutting on March 31.
Decades of effort. That framing is worth sitting with. Aircraft production at the former Naval Weapons Industrial Reserve Plant began in the 1940s. Northrop Grumman used the Bethpage site to build fighter jets and spacecraft, and for years the company also used it as an informal chemical waste dumping ground before eventually donating the property to the Town of Oyster Bay. What they left behind didn’t stay put. The plume started moving south through Long Island’s aquifer system, and regulators weren’t exactly racing to catch up.
The Long Island Press reported this week on the 2026 ribbon-cutting and the ongoing scope of the cleanup. The numbers in that coverage are sobering. Even with the Phase II plant now online, officials don’t expect full remediation for many more years. Groundwater contamination doesn’t respect timetables.
What’s the bottom line for Nassau County taxpayers and ratepayers? The Navy is funding this cleanup, which is something. But the Bethpage Water District and local municipalities have spent their own money on monitoring, litigation, and infrastructure upgrades tied to this contamination for a generation. Those costs don’t show up on a single ribbon-cutting press release.
The Phase II plant is real progress. The $46 million facility on Union Avenue represents the most significant new cleanup infrastructure in years, and the 97% active control figure isn’t nothing. But 25-plus years in, with the plume still 900 feet deep and miles wide, it’s hard to call this anything but a long and expensive lesson about what happens when industrial waste goes unaccounted for.
David Brayack was right. This will take many more years.