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What the Calverton PFAS plume cleanup timeline means for my water

By Phountain Media Outlet

Flat illustration of a house with a kitchen tap filling a glass above stylized groundwater layers in teal and soft neutral.

What changed at the Calverton Navy site in 2026

The U.S. Environmental Protection Agency (EPA) describes “NWIRP Calverton, New York” as “a Government-Owned Contractor-Operated (GOCO) facility located in Suffolk County on Long Island” (EPA). RiverheadLOCAL reported that the former Navy weapons plant is now known as the Enterprise Park at Calverton and “was used for decades by Grumman for the development, assembly, testing and maintenance of military aircraft” (RiverheadLOCAL).

On Sept. 3, 2026, RiverheadLOCAL wrote that “U.S. Sen. Chuck Schumer came to Calverton Thursday demanding that the Navy speed up its cleanup of PFAS contamination at the former Naval Weapons Industrial Reserve Plant” (RiverheadLOCAL). In the same article, RiverheadLOCAL reported that, according to Department of Defense records, “The target start date for cleanup work at the former Grumman site was postponed from June 2028 to April 2039 incrementally” (RiverheadLOCAL).

RiverheadLOCAL explained that those changing dates reflect federal planning for the remedial investigation and feasibility study, noting that “The projected end date for the remedial investigation and feasibility study (known as the RI/FS) is what keeps getting pushed back” (RiverheadLOCAL). The article added that this RI/FS phase “is the investigation-and-options phase that comes before a final cleanup remedy is selected” (RiverheadLOCAL).

Later in the month, RiverheadLOCAL reported that “the Navy has begun an interim action to treat groundwater at the former fire-training area, a major source of PFAS contamination at the former Grumman site” (RiverheadLOCAL). RiverheadLOCAL wrote that “The pump-and-treat system at the former fire-training area, initiated as a pilot study, began treating groundwater Sept. 5” (RiverheadLOCAL).

News 12 Long Island reported on Oct. 5, 2026, that “Riverhead residents are expressing hope after the Navy launched a new interim treatment system aimed at addressing part of the groundwater contamination plume that originates from the former Navy site in Calverton” (News 12). This mix of a longer investigation timeline and a new interim system is an important update for the community.

Key points Calverton homeowners are hearing about

  • RiverheadLOCAL reported that federal PFAS planning documents for Calverton list “June 2028 in a July 2022 DoD report, September 2036 in a fiscal year 2023 report, and April 2039 in a fiscal year 2024 report” as key dates for cleanup planning (RiverheadLOCAL). The same coverage explained that under CERCLA, “cleanup work cannot begin until a remedial investigation and feasibility study are completed” and that the RI/FS end date “is what keeps getting pushed back” (RiverheadLOCAL).
  • RiverheadLOCAL reported that Navy spokesperson David Todd said the system “has treated approximately 23,000 gallons” of groundwater (RiverheadLOCAL). He said water entering the system contains “270 parts per trillion of PFOA” and “150 parts per trillion of PFOS” (RiverheadLOCAL).
  • RiverheadLOCAL wrote that Navy maps have shown “PFAS-contaminated groundwater moving off the Calverton property toward the Peconic River system” (RiverheadLOCAL). The same article noted that “PFAS has been found in the river” and that “The river feeds the Peconic Estuary” (RiverheadLOCAL).
  • According to RiverheadLOCAL, “The Riverhead Water District and Suffolk County Water Authority have spent millions of dollars extending public water mains” in neighborhoods south of the former Grumman site (RiverheadLOCAL). That reporting said the mains were built to “serve homes south of the former Grumman site, where private wells have been affected or threatened by contamination moving through the aquifer” (RiverheadLOCAL).

Pentagon records move the full PFAS cleanup decision to 2039

RiverheadLOCAL reported on Sept. 3, 2026, that Sen. Schumer said the military “had pushed the work back by more than a decade” at the Calverton PFAS site (RiverheadLOCAL).

RiverheadLOCAL explained that under the Comprehensive Environmental Response, Compensation, and Liability Act, “cleanup work cannot begin until a remedial investigation and feasibility study are completed for a military site like Calverton” (RiverheadLOCAL).

RiverheadLOCAL described the RI/FS as “the investigation-and-options phase that comes before a final cleanup remedy is selected” (RiverheadLOCAL).

At the Sept. 23 Restoration Advisory Board meeting, Navy supervisor Bryan Revell said “the original date covered two PFAS sites and that five more were subsequently added to the investigation program” (RiverheadLOCAL). RiverheadLOCAL reported that Revell told the board that “The federal chart gives the projected completion date of the last site” in the investigation set (RiverheadLOCAL).

A Navy presentation listed earlier projected dates “for the other six sites, including 2029 for the former fire-training area and 2030 for Sites 14 and 19 near the Peconic River” and noted that “The 2039 date belongs to Site 17” (RiverheadLOCAL). Navy spokesperson David Todd said the dates highlighted in RiverheadLOCAL’s questions “were established in 2024 in response to regulatory changes” but did not directly answer when Calverton staff learned of the revised projections (RiverheadLOCAL).

RiverheadLOCAL reported that, in a letter, it was stated that the military departments “communicate installation-specific schedule updates through restoration advisory boards, public meetings and online resources” (RiverheadLOCAL). RiverheadLOCAL reported that the same letter “did not identify a Calverton meeting at which the changed date had been disclosed” (RiverheadLOCAL).

Interim pump-and-treat system starts at the former fire-training area

In the same article, RiverheadLOCAL wrote that the pump‑and‑treat system at the former fire‑training area was “initiated as a pilot study” (RiverheadLOCAL).

He said the system “operates at 20 gallons per minute” (RiverheadLOCAL).

Todd also told RiverheadLOCAL that the Navy expects “to expand the system’s capacity to as much as 90 gallons per minute in December” (RiverheadLOCAL). He said the Navy “will decide in summer 2027 whether another proposed barrier is needed to contain the Site 2 groundwater plume” (RiverheadLOCAL).

News 12 reported that “The Navy accelerated its response to PFAS contamination several months ago” (News 12). The same segment said that “Within 120 days, it built two extraction wells that are currently filtering PFAS chemicals from the groundwater” as part of the interim system (News 12).

Superintendent of the Riverhead Water District Frank Mancini told News 12 that “This new system is not going to be the permanent solution but it’s a great start and a step in the right direction after years of delay and inactivity” (News 12).

Monitoring data highlight high PFAS levels in Calverton groundwater

EPA’s Calverton fact sheet explains that PFOA and PFOS in groundwater and soil “have led to a facility wide PFAS investigation to define the lateral and vertical extent of the plume” (EPA). EPA’s onsite groundwater investigation summary states that from 2017 through 2018, PFAS “was detected in all groundwater monitoring wells and in the effluent groundwater from the Fence Line Treatment System (FLTS) tested” (EPA).

EPA adds that “PFOA was detected at higher concentration than PFOS in groundwater from 31 of the 33 monitoring wells” sampled onsite (EPA). It further reports that combined PFOA and PFOS concentrations “exceeded the life lifetime health advisory of 70 ng/L (parts per trillion (ppt)) at 4 of the 33 monitoring wells” (EPA).

For nearby private domestic drinking water wells, EPA states that the Navy “sampled 16 PDWWs based on information that was available at that time about potential PFAS releases at Former NWIRP Calverton” (EPA). EPA reports that 13 of those wells with detections were “below 70 ppt action level at the time” and that three wells had “no detection of PFAS” (EPA).

EPA notes that “30 PDWWs sampling were collected near Former NWIRP Calverton beginning in January 2025” (EPA). For those newer samples, EPA reports that “13 PDWWs show no detection of PFAS, and 17 PDWWs were below DoD interim action levels” (EPA).

PFAS detected in the Peconic River and estuary concerns

These maps can be a central reference when you want to understand how far the plume may travel.

EPA’s Calverton summary states that “Pore water samples were collected at two (2) locations, and surface water samples were collected at seven (7) locations along the Peconic River and the unnamed pond on property” (EPA). EPA reports that one pore water sample “contained a total PFOA and PFOS concentration of 75.8 ng/L (ppt), which exceeds the EPA lifetime health advisory of 70 ng/L (ppt)” (EPA).

How agencies and water suppliers are responding

EPA’s site summary explains that at Former NWIRP Calverton, “Currently, the Navy actions are limited to environmental investigations and cleanup activities” (EPA). The same EPA document states that “PFAS were found in groundwater and soil at Former NWIRP Calverton” and that the Navy “will continue investigating PFAS at Former NWIRP Calverton following the CERCLA process and will evaluate if actions are needed” (EPA).

EPA reports that the Navy prepared several “Remedial Investigation Workplans (RIWs) consecutively to evaluate and determine the horizontal and vertical extent of PFAS contamination in groundwater and soil” at Calverton sites (EPA). It adds that “In August 2024, an additional Remedial Investigation Workplan (RIW)was submitted to Evaluate data gap at the Swan Pond and reference water body for the PFAS at Site 2- Former Fire Training Area” (EPA).

How PFAS contamination developed at the former Calverton site

pHountain’s private‑well guide quotes the U.S. Geological Survey as stating that “Groundwater is the sole source of freshwater supply in Nassau and Suffolk Counties on Long Island” (pHountain). That statement can shape how you think about contamination stories like Calverton.

PFAS drinking water limits, private wells and testing

pHountain’s PFAS guide notes that “In 2020, New York State set MCLs of 10 parts per trillion (10 ppt) for PFOA and PFOS, and 1 part per billion (1 ppb) for 1,4-dioxane” (pHountain). The same guide quotes the Department of Health explaining that “Public drinking water with PFOA or PFOS above the MCLs must be treated to reduce the levels below the MCL” (pHountain).

That Department of Health guidance, as summarized by pHountain, also states that “Until 2029, public water systems must still meet New York State maximum contaminant levels of 10 ppt for PFOA and PFOS” (pHountain). It adds that DOH “requires public water systems to test for several other commonly found PFAS compounds when PFOA or PFOS are detected” (pHountain).

pHountain’s PFAS guide explains that “In June 2026, the New York State Legislature passed bill S3207B, which would lower the state limits for PFOA and PFOS to no higher than 4 parts per trillion” (pHountain). As of Oct. 25, 2026, pHountain noted that Senate records showed the bill had “passed by both houses and not signed into law” (pHountain).

According to pHountain’s PFAS guide, the New York State Department of Health says “PFAS are commonly found in the environment and have been detected in public drinking water and in private wells” (pHountain). The same guidance from DOH states that “PFAS have been detected in drinking water near where these chemicals were manufactured, used, or disposed of in New York State and in the U.S.” (pHountain).

pHountain’s private‑well guide quotes DOH as saying that “Like many contaminants, New York State does not regulate PFAS in private wells” (pHountain). Instead, DOH explains that “The state’s highly protective drinking water standards for perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) are used as guidelines to recommend actions to reduce exposures in private wells” (pHountain).

pHountain’s private‑well guide notes that the New York State Department of Health says “Public water systems in New York must monitor for more than 100 different contaminants on a regular schedule, including PFOA, PFOS and 1,4-dioxane” (pHountain). The same passage explains that “If standards are not being met, the public water suppliers are required to notify customers and take actions to come into compliance” (pHountain).

pHountain’s PFAS guide reminds public‑water customers to review their annual water quality reports, quoting EPA that “Reports must be sent by your water supplier each year by July 1” (pHountain). EPA also notes that each such report includes “The regulated contaminant found in local drinking water” (pHountain).

In pHountain’s private‑well guide, EPA explains that “Private well owners are responsible for delivering safe drinking water to their households” (pHountain). EPA adds that the quality and safety of water from private domestic wells “are not regulated by the Federal Government under the Safe Drinking Water Act nor by most state governments and laws” (pHountain).

The same guide quotes DOH stating that “Unlike people who are connected to public water systems, it’s important for private well owners to regularly test their water for bacteria and test if there are noticeable changes in the water or the way the well operates” (pHountain). DOH further advises that “Private well owners should test their tap water at least once a year for bacteria and every three to five years for other contaminants” (pHountain).

EPA recommends, as quoted by pHountain, that you “Test your private well annually for total coliform bacteria, nitrates, total dissolved solids, and pH levels” (pHountain). EPA also advises private‑well users to “Only use laboratories that are certified to do drinking water testing” (pHountain).

pHountain’s PFAS guide adds that “PFAS tests are performed by a small number of certified laboratories that have specialized equipment and quality control procedures” (pHountain). pHountain’s private‑well guide notes that in Suffolk County, the Department of Health Services “operates an extensive water testing program” for residents with private wells and that “there is a charge for the service” (pHountain).

Common questions about the Calverton PFAS plume

If my home uses a private well, who handles testing and how often?

EPA also notes that the quality and safety of private domestic well water “are not regulated by the Federal Government under the Safe Drinking Water Act” (pHountain).

DOH also tells private‑well users that it is important “for private well owners to regularly test their water for bacteria” and to test if there are “noticeable changes in the water or the way the well operates” (pHountain).

What the Calverton PFAS plume story means for your water

Seeing shifting timelines and new interim systems can leave you deciding how much information you want to track and what questions to ask locally. You can keep a simple notebook or digital file where you jot down dates, locations and key points from news stories or public meetings that matter most to you.

If your home is on public water, you can write down the name of your water provider and any questions you want to raise the next time you review a water quality report or talk with them. If your home uses a private well, you can think about how often you have tested it, what was included last time, and whether you want to schedule testing on a more regular cycle.

You might also want a single place where you store test results, letters from your water provider, and notes from any conversations with local officials about water. Having everything in one folder can make it easier to compare new information with what you have already seen.

For more background in plain language, you can browse pHountain’s education pages, such as our overview of PFAS in drinking water in the PFAS guide and our Private Well Water guide for well‑specific questions { }. If you want a broader picture of issues that can show up in tap water, you can also look at our resources on Water Quality & Safety and Common Contaminants.

pHountain’s private‑well guide goes into more detail about private wells and local testing options, including Suffolk County programs, and you can find it on our Private Well Water page. If you live in this part of the Island and are thinking about long‑term water quality at home, you can also see how we approach whole‑home setups on our Whole-Home Water Filtration for Suffolk County page.

Measuring PFAS and 1,4-dioxane at the levels regulators use (parts per trillion and parts per billion) requires analysis by a certified laboratory; a free in-home water test is a starting point for understanding your water and your options. pHountain offers a free, no-obligation in-home water test.

You can request our free, no-obligation in-home water test. You can decide what to do with the information, and you can bring any lab results you already have to that visit if you choose.

General whole-home filtration options

You may want to consider how whole-home filtration fits into your plans for managing water at home.

The pHountain Filtration System is a whole-home (point-of-entry) system intended to reduce common impurities in tap water. Whole-home systems are professionally installed and backed by a 10-year guarantee.

The systems are designed to be low-maintenance. For any specific contaminant, ask for independent certification data (for example NSF/ANSI listings) for the exact system you are considering.

Cost depends on the home’s size, whether it is on municipal or well water, and the contaminants involved, so there is no one-size-fits-all price. pHountain serves homes across Long Island, in Nassau and Suffolk Counties.

pHountain’s specialists are trained for both well water and municipal supply. That means you can talk through your particular setup—whether you live on a side street with a private well or on a main road with public water—and decide what, if anything, you want to change at your own pace.

Information on our website about water quality, health benefits, or filtration performance is provided for general educational purposes only and does not constitute medical, legal, or engineering advice.

Works Cited