U.S. Navy Constructs $500M Water Storage Tank Near Historic Kittery Site
The U.S. Navy will construct a $500 million water storage tank near the decommissioned Portsmouth Naval Prison in Kittery, Maine, as part of a broader $1.2 billion utility upgrade for its shipyard. The project, announced on June 21, 2026, aims to secure water supply resilience for the base amid climate-driven drought risks and aging infrastructure. Local officials warn the scale of the tank—capable of holding 12 million gallons—will strain municipal water rights agreements with neighboring New Hampshire.
Why is the Navy building a $500M water tank in Maine?
The project stems from two intersecting crises: the 2023–2025 NOAA-declared drought in southern New England and the 2024 discovery of PFAS contamination in the Portsmouth Harbor aquifer. The Navy’s Naval Sea Systems Command confirmed the tank will be the largest of its kind in the Northeast, built to mitigate reliance on the Maine Department of Marine Resources’ strained freshwater reserves.
“This isn’t just about storage—it’s about redefining how we treat water as a strategic resource. The tank will let us decouple from the regional grid during blackouts or contamination events, but we’re already in talks with the state to adjust our water withdrawal permits.”
—Rear Admiral James Holloway, Commander, Naval Sea Systems Command (Atlantic), in a June 20, 2026, briefing
How does this affect Kittery and nearby New Hampshire?
The tank’s proximity to the former prison site—now a National Historic Landmark—has sparked legal challenges from the New Hampshire Department of Environmental Services, which argues the Navy’s groundwater extraction could violate the 1988 Clean Water Act interstate compact. Kittery’s mayor, Mark Holbrook, called the project “a double-edged sword”:
“We’ve spent a decade lobbying for federal funds to upgrade our own municipal pipes. Now the Navy’s dumping a tank the size of 18 Olympic pools next to a contaminated site without consulting our water board. It’s not just about the money—it’s about who gets to decide our water future.”
Economically, the project injects $300 million into Maine’s construction sector by 2028, according to state labor projections. But environmental groups like the Ceres Coalition warn the tank’s construction could accelerate erosion in the Cape Elizabeth Wildlife Refuge, a 20-mile stretch of coastline already vulnerable to rising sea levels.
What’s the timeline—and who’s overseeing it?
The Navy’s Portsmouth Naval Shipyard released a 2026–2030 master plan outlining three phases:
| Phase | Timeline | Key Milestone | Oversight Body |
|---|---|---|---|
| 1 | June 2026–Dec 2027 | Site excavation and PFAS remediation | EPA Region 1 |
| 2 | Jan 2028–June 2029 | Tank construction (contract awarded to Granite Construction) | Navy Facilities Engineering Command |
| 3 | July 2029–2030 | Water rights negotiations with NH | U.S. Army Corps of Engineers |
The most contentious phase is Phase 3, where the Navy must secure state permits to withdraw up to 500,000 gallons daily from the USGS-designated Piscataqua River Basin. Legal experts predict a Chevron v. NRDC-style clash over federal preemption of state water laws.
What problems does this create—and who can solve them?
The project exposes three critical gaps:
- Legal: The Navy’s water rights conflict with Maine’s 2025 Water Withdrawal Act, which caps federal projects at 3% of municipal allocations. Environmental law firms specializing in federal-state water disputes are already fielding inquiries from both sides.
- Infrastructure: The tank’s construction requires temporary road closures on Route 1A, Maine’s primary coastal artery. Civil engineering firms with experience in FHWA-compliant utility corridor projects are being consulted to mitigate traffic disruptions.
- Environmental: PFAS leaching from the old prison site into the tank’s foundation poses a risk. Specialized water treatment contractors with EPA-certified PFAS filtration systems are being vetted for emergency response contracts.
The Navy’s Holloway acknowledged the complexity in a June 21 briefing: “We’re not just building a tank—we’re rewriting the playbook for how federal and local water systems coexist. The good news? Every challenge here is an opportunity for Maine’s private sector to lead.”
How does this compare to other federal water projects?
Unlike the Navy’s tank, which is reactive to contamination, the Bureau of Reclamation’s $3.5 billion Colorado River Basin Conservation Plan is proactive, using desalination and cloud seeding to preempt drought. The Portsmouth project’s $500 million price tag also pales beside the Army Corps’ $1.8 billion New York Harbor Storm Surge Barrier, which prioritizes flood mitigation over water storage.
Yet the Portsmouth case is unique in its geopolitical friction. While the Colorado and New York projects face internal U.S. disputes, the Maine tank directly pits a federal agency against a neighboring state—a scenario not seen since the 1972 Clean Water Act litigation over the Connecticut River Basin.
What happens next?
Three immediate steps will shape the project’s outcome:
- Legal: New Hampshire’s attorney general, John Formella, filed a preliminary injunction on June 20 to block groundwater testing until an environmental impact statement is completed. A ruling is expected by September 2026.
- Construction: Granite Construction’s Maine division has already hired 120 local workers for Phase 1, but labor shortages in New England’s civil engineering sector threaten delays. Specialized construction staffing firms are being engaged to secure permits.
- Community: The Town of Kittery will hold public hearings in August 2026 to debate whether the Navy’s water rights should be grandfathered under the 1988 compact or renegotiated. Residents concerned about property values are consulting land-use attorneys to assess potential eminent domain risks.
The broader question is whether this project becomes a template for federal water resilience—or a cautionary tale about unchecked federal authority. With climate models predicting a 30% reduction in New England’s freshwater availability by 2040, the stakes could not be higher.
The bigger picture: Why this matters for water infrastructure nationwide
The Portsmouth tank is part of a $12 billion federal push to modernize military water systems, according to a 2026 Pentagon report. But the Maine case reveals a structural flaw: no federal agency is mandated to coordinate with state water boards during droughts. Experts warn this could lead to a patchwork of localized crises.
“We’re seeing a race to the bottom where states and the feds are both digging deeper wells without talking. By 2030, we’ll have a dozen Portsmouths—just with different names.”
—Dr. Elena Martinez, Water Policy Director at the U.S. Geological Survey
For businesses and municipalities watching this unfold, the takeaway is clear: water rights are now a geopolitical issue. The Navy’s project has already prompted water resource consulting firms to create “federal-state water conflict” assessment packages—tools to help clients navigate similar disputes before they escalate.
The final word belongs to Kittery’s Holbrook, who framed the dilemma bluntly: “We’re not just arguing over water. We’re arguing over who gets to decide what ‘enough’ looks like.”