Long Island’s Local Water Filtration Company
Whole-Home Water Filtration Across Long Island
pHountain is based in Islip — we’re not a national chain that sells Long Island as a market. This is our home. We know its water, its aquifer, and the specific threats facing every community from Valley Stream to Southampton.
Full Island Coverage
Serving Every Corner of Long Island
From the Queens border to Montauk Point — if you live on Long Island, pHountain serves you.
Nassau County
Garden City, Hempstead, Massapequa, Levittown, Great Neck, Oyster Bay & more.
View Nassau County pageSuffolk County
Huntington, Smithtown, Bay Shore, Patchogue, Riverhead, Southampton & more.
View Suffolk County pageCommunities We Serve Across Long Island
- Great Neck
- Port Washington
- Manhasset
- Garden City
- Hempstead
- Valley Stream
- Freeport
- Long Beach
- Massapequa
- Wantagh
- Levittown
- Hicksville
- Plainview
- Oyster Bay
- Syosset
- Rockville Centre
- Huntington
- Northport
- Babylon
- Amityville
- Bay Shore
- Islip
- Lindenhurst
- West Babylon
- Smithtown
- Hauppauge
- Commack
- Brentwood
- Patchogue
- Medford
- Riverhead
- Southampton
This is a partial list. We service every Long Island community. Call us to confirm your area.
Long Island Runs on One Water Supply — and It’s Under Threat
The EPA has designated Long Island’s groundwater as a Sole Source Aquifer — meaning it is the only viable drinking water supply for the entire island and there is no backup. No rivers. No alternative reservoirs. Every drop of drinking water on Long Island comes from a single underground system that is recharged by rainfall percolating through soil. PFAS, nitrogen from 360,000+ cesspools, 1,4-dioxane, and industrial contamination plumes are all moving through that system right now. Protecting your home’s water at the point of entry isn’t a luxury — it’s a practical response to a documented reality.
See What’s in Your Water — FreeLong Island’s Water Story
How Water Gets to Your Tap — and Where It Goes Wrong
Long Island sits on a layered glacial aquifer system built up over thousands of years. Understanding how it works explains why surface activity — fertilizers, industrial chemicals, airport foam — eventually shows up in the water you drink.
Rain and snowmelt percolate downward through sandy glacial soil, carrying whatever is on the surface — fertilizers, road chemicals, lawn pesticides — into the aquifer below.
The shallowest layer. Most vulnerable to surface contamination. Nitrogen from cesspools, PFAS from industrial sites, and pesticide runoff accumulate here first.
The primary drinking water source for most of Long Island. Deeper and more protected, but contamination from the Upper Glacial layer migrates downward over decades.
Whether delivered by a municipal district or drawn from a private well, the water in your home originated in this system — carrying whatever it accumulated along the way.
A whole-home point-of-entry system intercepts contaminants at the moment water enters your property — before it reaches your kitchen, your shower, or your family.
Island-Wide Threats
The Water Quality Challenges Facing Long Island Homeowners
These aren’t isolated incidents. They are documented, ongoing threats affecting communities across Nassau and Suffolk Counties.
PFAS at Airports & Military Sites
PFAS-containing firefighting foam has been used for decades at Long Island MacArthur Airport, Gabreski Airport, Calverton, and former Naval Air Station facilities. Contamination plumes from these sites have spread into surrounding groundwater, affecting communities in both Nassau and Suffolk. The EPA’s 2024 PFAS rule sets enforceable limits at 4 parts per trillion — a threshold many LI water districts are still working to meet.
Nitrogen from 360,000+ Cesspools
Long Island has more cesspools than any other county in New York State. Suffolk County alone has an estimated 360,000 cesspools and aging septic systems releasing nitrogen-rich wastewater directly into the soil above the aquifer. This nitrogen reaches drinking water wells and flows into bays, where it drives toxic algae blooms that have devastated local shellfish industries. Nassau is also affected, particularly in older residential areas.
The Bethpage Contamination Plume
Beginning in the 1940s, Grumman Aerospace discharged solvents, chromium, and other industrial chemicals at the Bethpage facility on the Nassau-Suffolk border. That contamination entered the aquifer and has been moving eastward through the Magothy layer ever since. The plume spans multiple miles and has affected water districts in Bethpage, Levittown, Hicksville, and nearby communities. It remains one of New York State’s most significant active Superfund sites.
1,4-Dioxane in Western Suffolk
1,4-Dioxane, a likely human carcinogen, has been detected in groundwater across Brentwood, Central Islip, Bay Shore, Hauppauge, and Commack. New York State has enacted one of the most stringent 1,4-dioxane standards in the nation at 1 part per billion. Standard carbon filtration does not remove it, which is why understanding your specific water chemistry — not just assuming a filter works — is critical.
Hard Water & Mineral Buildup
Long Island’s aquifer water picks up calcium and magnesium as it moves through glacial deposits. The result is moderately hard to hard water that leaves scale on fixtures, reduces water heater efficiency by up to 30%, causes dry skin and hair, and shortens the lifespan of dishwashers, washing machines, and ice makers. Whole-home filtration addresses this at the source, before it reaches any appliance.
Chlorine & Disinfection Byproducts
Municipal water districts across Long Island add chlorine to suppress bacterial growth during distribution. At the household level this produces taste and odor complaints, but the more significant issue is the formation of trihalomethanes (THMs) and haloacetic acids when chlorine reacts with naturally occurring organic matter. Long-term exposure to elevated THMs has been associated with increased cancer risk. A point-of-entry system eliminates both chlorine and its byproducts at the meter.
Which of these affects your home depends on your location and water source. A free in-home water test is the only way to get a precise answer.
Long Island’s Own
Why Long Island Homeowners Choose pHountain
We’re not passing through. We live here, work here, and our families drink the same Long Island water yours does.
Born & Based on Long Island
pHountain was founded on Long Island to solve a Long Island problem. Our Islip headquarters puts us at the center of our service area, and our technicians know every local water district by name.
We Test Before We Recommend
Every consultation starts with a real water test at your home. We don’t quote systems over the phone or assume your water matches a regional average. The recommendation follows the results, not the other way around.
10-Year System Guarantee
Every system we install is backed by a 10-year performance guarantee. That level of confidence comes from knowing the products we choose are engineered for Long Island’s specific water chemistry.
Certified Installation, Zero Maintenance
Our technicians handle every installation to the same standard we’d expect in our own homes. Once installed, the system runs continuously with no cartridges, no service calls, and no recurring costs.
Our Systems
Filtration Systems for Every Long Island Home
A Valley Stream Cape Cod and a Southampton estate have very different water demands. We have a system sized for both — and every home in between.
PureFlow Plus
Homes 500 – 2,000 sq ft
- 1,000,000+ gallon capacity
- Family of 5 or fewer
- 10-year guarantee
- Maintenance-free
Hydramax Pro
Homes 1,500 – 4,000 sq ft
- 1,500,000+ gallon capacity
- Family of 4 or more
- 10-year guarantee
- Maintenance-free
Grand Estate
Homes 3,000 – 7,000+ sq ft
- 2,000,000+ gallon capacity
- Family of 5 or more
- 10-year guarantee
- Maintenance-free
No Obligation, No Pressure
Free In-Home Water Test for Any Long Island Home
Aquifer contamination is not visible, tasteable, or detectable without proper testing. Our certified water specialists travel to your home, run a comprehensive assessment, and give you a clear picture of what’s in your water — at no charge and with no pressure to buy anything.
Your free water test includes:
- Hardness, pH, iron, TDS, and nitrate testing
- Chlorine and disinfection byproduct screening
- PFAS and 1,4-dioxane screening for properties in affected areas
- Assessment of municipal supply versus private well water needs
- A transparent, itemized quote — only if your results call for a system
Good results are good news. We’ll tell you that too.
Schedule Your Free Long Island Water Test
We respond within one business day to schedule your appointment.
Common Questions
Frequently Asked Questions — Long Island
Does pHountain cover all of Long Island, including the East End?
Yes. We service every community in Nassau and Suffolk Counties, including the East End and the Hamptons. Our Islip headquarters puts us centrally located on the island, with technicians who travel county-wide. Call 1-631-991-3995 to confirm availability in your area.
What is a Sole Source Aquifer and how does it affect me?
A Sole Source Aquifer is an EPA designation for a groundwater supply that is the only practicable source of drinking water for the population it serves. Long Island’s aquifer carries this designation, meaning if the aquifer becomes contaminated at scale, there is no alternative water supply for the 2.8 million people who live here. The designation heightens the importance of protecting individual homes at the point of entry, since the island’s groundwater recovery from widespread contamination would be a generational challenge.
What is the Bethpage contamination plume and should I be concerned?
The Bethpage plume originated from decades of industrial chemical disposal at the former Grumman Aerospace facility in Bethpage. Solvents, chromium, and other chemicals entered the Magothy aquifer and have been moving eastward since the mid-20th century. The plume has affected water districts in Bethpage, Levittown, Hicksville, and neighboring communities. It is one of New York State’s most significant active Superfund sites. If you live in or near this corridor, a water test is the most direct way to assess your home’s exposure.
My water district sends a Consumer Confidence Report every year. Why do I need a separate test?
Consumer Confidence Reports (CCRs) report on water quality at the point of distribution — when it leaves the treatment plant. They do not account for what happens to your water inside aging local mains or your home’s own plumbing. A CCR showing compliant lead levels doesn’t mean your tap is lead-free if your home has older pipes. Additionally, CCRs report averages across the entire district, not your individual household. An in-home test gives you results specific to the water coming out of your taps.
How long does installation take and is it disruptive to the household?
Most whole-home installations are completed in 2 to 4 hours. The system is installed at your main water supply entry point — typically in the basement or utility space — and requires a brief water shutoff during connection. Our technicians work cleanly and efficiently. Once installed, the system operates silently and continuously with no maintenance required.
We buy bottled water because we don’t trust the tap. Isn’t that enough?
Bottled water addresses drinking water at one tap, but your family is also exposed through showering, bathing, cooking, and doing laundry. PFAS and chloramine absorb through skin during showers. Volatile compounds like chloroform release into indoor air when hot water is used. A whole-home point-of-entry system filters every point of use in the home — which bottled water cannot. It also eliminates the cost and environmental impact of purchasing bottled water long-term.
Long Island Families
What Our Long Island Customers Are Saying
“I’d read about the Bethpage plume for years and always worried about our water in Levittown. pHountain came out, tested it, and showed us exactly what was there. Having a real answer after years of uncertainty was worth the call alone. The system has been running perfectly for two years.”
“We’d been spending nearly $100 a month on bottled water for years. The pHountain system cost us once and now every tap in the house gives us better water than anything from a bottle. I wish someone had told us sooner.”
“The technician arrived on time, explained everything he was testing for, and completed the installation in under three hours. What impressed me most was that he didn’t try to upsell us. The system he recommended was the one that matched our water results — nothing more.”
Your Next Step
Long Island Has One Water Supply. Protect Yours.
Book a free in-home water test with Long Island’s own water filtration specialists. No obligation, no pressure — just honest answers about what’s in your water.