Is My Calverton Well Water at Risk from PFAS

Calverton homeowners with private wells are asking more and more about PFAS contamination and what the U.S. Navy’s Calverton PFAS testing of private wells, announced in January 2025, actually means for their drinking water.

This post walks through what’s happening near the former Grumman / Naval Weapons Industrial Reserve Plant (NWIRP) site, why PFAS are a concern for private wells, and how local, whole-home filtration can fit alongside official testing.

1. The Navy’s PFAS Testing of Calverton Private Wells

The U.S. Navy has agreed to provide PFAS testing for private wells near the former Grumman plant at EPCAL in Calverton after years of advocacy by residents and local officials.¹

According to the East End Beacon’s report:

Private wells near the site can be sampled for PFAS by the Navy
At a January 2025 open house, residents could ask whether their property was inside the sampling area and schedule testing¹
Preliminary lab results are expected within about 30 days of sampling

Soil and water contamination at the Calverton site has been under review for more than four decades, and contaminants have migrated down into groundwater in a plume that extends offsite.¹ That is why nearby private wells are getting closer attention now.

If your home is near the former Grumman / NWIRP Calverton property and you rely on a private well, it’s worth confirming whether you qualify for Navy PFAS sampling and considering your own independent testing as a second data point.

2. What PFAS Are and What They Mean for Calverton Residents

2.1 Defining PFAS: Persistence and Impact

PFAS (per- and polyfluoroalkyl substances) are a large family of man‑made chemicals used since the 1950s in stain‑ and water‑repellent products and many industrial applications.¹

Key characteristics:

Extremely persistent: PFAS break down very slowly and are now found almost everywhere in the world because of extensive production and use.¹
Difficult to treat: A Stony Brook researcher at the university’s June 2026 Clean Water Symposium said PFAS contamination is very difficult to get rid of.²

2.2 The Broader PFAS Situation Across Long Island Groundwater

Long Island’s sole‑source aquifer is already under pressure from multiple contaminants. At that symposium, hosted by Stony Brook University’s Center for Clean Water Technology, scientists and policymakers pointed to PFAS as an emerging groundwater issue across the region, alongside nitrogen and other pollutants.²

Speakers emphasized:

PFAS “forever chemicals” are now being detected in groundwater supplies around Long Island²
Translating water-treatment technologies from the lab into real-world use is complex, and many PFAS treatment technologies are expensive²

For Calverton homeowners, that means PFAS concerns are not isolated to one property line. They are part of a broader groundwater challenge across Long Island.

3. Understanding Regulatory Standards That Influence Calverton Well Water

3.1 Differences Between Public Water and Private Well Regulations

In April 2024, the U.S. Environmental Protection Agency (EPA) finalized enforceable limits for public drinking water systems of 4.0 parts per trillion (ppt) each for PFOA and PFOS, along with limits of 10 ppt for PFHxS, PFNA and HFPO-DA (GenX) and a hazard-index limit for certain PFAS mixtures. Public water systems must comply by 2029. In May 2026, EPA proposed letting systems request two more years (to 2031) for PFOA and PFOS and proposed rescinding the PFHxS, PFNA, GenX and mixture limits; those proposals were not final as of September 2026.⁴ New York set its own limits of 10 ppt for PFOA and PFOS for public water systems in 2020.⁵

However:

Those federal and state limits do not apply to private wells; private well owners are responsible for the safety of their own drinking water⁶
The East End Beacon’s report describes a separate U.S. Department of Defense action level of 12 ppt for PFAS associated with its facilities¹
New York State’s Department of Health focuses primarily on public water systems, but also offers guidance to homeowners on maintaining and safeguarding private wells³

In other words, if you are on a private well in Calverton, you are not automatically covered by the same regulatory protections as residents on public water. You are largely responsible for monitoring and managing your own water quality, with support from state and local programs.

3.2 Resources and Guidance Provided by New York State Officials

The New York State Department of Health:

Oversees the operation, design and quality of public water supplies and bottled water providers³
Provides tools to view public water data, maps and annual drinking water reports³
Offers resources for homeowners on helping reduce exposure to contaminants and maintaining private wells and septic systems³

For a Calverton homeowner with a private well, those resources can help you understand best practices, but you still need:

Targeted testing for PFAS and other contaminants
A plan for treatment or filtration at the household level if contaminants are detected

4. Insights Into the Navy’s PFAS Testing Program and Its Implications

4.1 What You Need to Know About the Navy’s Sampling Process

The Navy’s testing initiative near NWIRP Calverton is focused on sampling private wells in a defined area around the former facility.¹ At a January 2025 open house, residents could:

Learn whether their property is within the sample boundary
Schedule an appointment to have their well sampled
Ask questions one‑on‑one with representatives from the Navy, NYS Department of Environmental Conservation and NYS Department of Health¹

The timeline for results is roughly:

Step in Navy Process	Approximate Timing	Who Gets the Information
Sample collection at your well	Scheduled appointment	Navy and contracted lab
Preliminary lab results	Within ~30 days of sampling	Property owners and tenants notified by phone¹
Final results	Within ~3 months	Mailed to owners/tenants and posted online¹

This program is a significant step forward in documenting PFAS levels near the site, but it has limitations:

It applies only to properties within the Navy’s designated sampling zone
It is focused on PFAS related to the former facility, not every possible contaminant in your well
Results are a snapshot in time, not continuous monitoring

4.2 Reasons to Consider Additional Independent Water Testing

Even if you are inside the Navy’s sampling area, you may decide to pursue additional, independent testing, because:

Certified private labs can test for a broader panel of contaminants, including metals, bacteria, and other industrial chemicals
You may want a second opinion or more frequent testing than the Navy provides
Some homeowners prefer to work directly with a company that can both review test results and design filtration tailored to their home

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.

If you’d like a local perspective beyond the federal testing program, you can request a Free In-Home Water Test from pHountain Water Filters.

5. Recommended Steps for Protecting Your Calverton Well From PFAS

If you rely on a private well in Calverton, here is a practical, sequential approach:

5.1 Verify Your Location Relative to the PFAS Sampling Boundary

Locate your home relative to NWIRP Calverton: Check maps and notices related to the former Grumman / Navy site and the Navy’s sampling program.¹
Contact program representatives: Ask the Navy’s project team, or check the Navy’s online program information, whether your address is inside the sampling area.¹
Sign up for sampling if eligible: If your property qualifies, schedule a PFAS sampling appointment at your well.

5.2 Pursue Comprehensive Testing If Outside Official Zones

If your home is outside the Navy’s designated zone, or you want a more comprehensive picture:

Review state and county well guidance: The state’s Drinking Water Protection Program provides general advice on private wells and contamination concerns,³ and the Suffolk County Department of Health Services takes applications for private well testing.⁷
Order independent well testing: Work with a certified lab to test for:
- PFAS compounds
- Bacteria and microorganisms
- Heavy metals
- Sediment and other environmental contaminants
Schedule a local consultation: pHountain Water Filters can visit homes across Suffolk County, including Calverton, to evaluate well conditions and review test results as part of a Whole-Home Water Filtration for Suffolk County solution.

5.3 Evaluate Temporary Measures Versus Permanent Solutions

Once you have test results, you will need to decide how to respond:

Short‑term measures might include:
- Using bottled water for drinking and cooking
- Installing small point‑of‑use filters at a single tap
Long‑term measures typically focus on:
- Whole‑home filtration at the main water entry point
- Professional installation and ongoing support

If you are weighing bottled water against a permanent solution, pHountain Water Filters has a dedicated resource comparing Water Filters vs Bottled Water to help with that decision.

6. How Whole-Home Water Filtration Fits for Calverton Well Owners

For private well owners on Long Island, whole‑home filtration offers house‑wide coverage: every faucet, shower and appliance receives filtered water, not just a single sink.

A whole-home system is configured around what testing finds. For any specific contaminant, ask for independent certification data (for example NSF/ANSI listings) for the exact system you are considering.

pHountain Water Filters specialises in customised whole‑house systems for Long Island homeowners, pairing water testing and analysis with professional installation. Its pHountain Filtration System is a whole-home (point-of-entry) system with a cartridge-free media design intended to reduce common impurities in tap water, backed by a 10-year guarantee.

7. Working With pHountain Water Filters: What to Expect in Calverton

If you decide to explore a filtration solution with pHountain Water Filters, the process typically follows these steps:

Initial consultation: You share your well location, concerns and any existing test results. This can include Navy PFAS data or independent lab reports.
Water testing: A free in-home water test, together with any Navy or certified-lab results you already have, gives a picture of your overall water conditions.
System recommendation: Based on the findings, they propose a customised filtration configuration, often centered around the pHountain Filtration System for whole‑home coverage.
Professional installation: Trained technicians handle all aspects of plumbing integration, ensuring the system is correctly sized and connected for your home.
System verification: After installation, the system is tested and fine‑tuned to confirm proper operation.
Homeowner orientation: You learn how the system works, what it is designed to do and how basic maintenance will be handled.
Ongoing support: pHountain Water Filters provides long‑term assistance, including maintenance guidance and potential upgrades if your water conditions change.

To see how this approach applies across Long Island, you can review pHountain Water Filters’ broader Water Filtration Long Island NY service area.

8. Answers to Frequent Queries from Calverton Well Owners About PFAS

Does the Navy’s PFAS testing cover every private well in Calverton?

No. The Navy testing program is focused on private wells within a defined sampling area near the former Grumman / NWIRP Calverton site.¹ If your home is outside that boundary, your well may not be automatically included. You can still pursue independent testing through a certified private lab.

If my Navy PFAS test comes back below 12 ppt, do I still need filtration?

The 12 ppt level, as the East End Beacon reported it, is a U.S. Department of Defense action level, not a drinking-water standard for private wells.¹ For comparison, EPA’s limit for PFOA and PFOS in public water systems is 4.0 ppt each⁴ and New York’s is 10 ppt;⁵ neither applies to private wells, but both are useful benchmarks when you read your results. Whether to add home filtration is your decision; a certified lab result read against those benchmarks gives you a sound basis for making it.

How often should I test my Calverton private well for PFAS?

There is no single rule that fits every well. Because PFAS are persistent,¹ and because groundwater plumes can shift over time, periodic testing makes sense, especially near known contamination sites. Combining official sampling (such as the Navy’s program) with regular independent testing can give you a more complete picture.

Is this issue unique to Calverton, or should other Suffolk County well owners also be concerned?

While the Navy’s PFAS testing is specific to Calverton and the former Grumman / NWIRP site, PFAS and other contaminants have been identified in groundwater across Long Island.² Any Suffolk County homeowner on a private well may want to consider periodic testing and, if needed, whole‑home filtration. pHountain Water Filters serves Suffolk County communities broadly through its Whole-Home Water Filtration for Suffolk County services.

For Calverton homeowners, the combination of official Calverton PFAS testing, independent well analysis and professionally installed filtration can create a clear, practical path forward.

If you’d like to understand your own water better and explore filtration options tailored to your home, you can request a Free In-Home Water Test from pHountain Water Filters.

This content is for informational purposes only and is not intended as health, medical, or regulatory advice. Always consult appropriate government agencies and qualified professionals for guidance specific to your situation.

Is My Calverton Well Water at Risk from PFAS