Water treatment in Nassau County, built for the aquifer
Nassau's public water comes from more than 1,100 wells drilled into the Magothy aquifer, not a river or reservoir. That changes what actually needs treatment here.
- Free in-home testing
- No obligation
- 1,4-dioxane reduction
- Bilingual service
What contaminants are commonly found in Nassau County well water?
Even Nassau's public water is well water. It is pumped from more than 1,100 large-capacity wells in the shared Long Island Magothy aquifer, and the signature contaminant here is 1,4-dioxane, an industrial solvent found across dozens of Long Island water districts.
1,4-dioxane is a likely human carcinogen that ordinary carbon filters do not remove well. New York has proposed tightening its allowable level from a blanket 50 ppb organics limit to 1.0 ppb specifically for this chemical.
In Freeport specifically, EWG testing of the village's wells found PFHxS, PFOA and radium-226/228 all above health guidelines, a pattern typical of Long Island groundwater rather than the surface reservoirs that supply our Hudson Valley counties.
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large capacity wells supplying Long Island's public water
Long Island groundwater, a different set of issues
Nassau's aquifer supply carries a different contamination profile than our reservoir-fed counties.
- More than 50 water companies and districts serve Nassau and Suffolk together from the shared Magothy aquifer system, drawing on 1,100+ large-capacity wells for 2.6 million Long Islanders.
- 1,4-dioxane, an industrial solvent and likely human carcinogen, is the signature Long Island contamination issue, found across dozens of districts.
- EWG testing of the Village of Freeport's own wells (a Nassau example) found PFHxS at 1,818 times its health guideline, PFOA at 22 times, and radium-226/228 at 11 times, all typical of the aquifer's groundwater chemistry.
- Hardness on Long Island is typically reported as much softer than our Hudson Valley counties, around 28 ppm by independent estimators, since groundwater carries less dissolved mineral than surface reservoirs.
- Nassau County is almost entirely on public water. Of the roughly 200,000 Long Islanders on private wells, most are concentrated in Suffolk, not Nassau.
Aquifer water needs a different fix
Nassau's biggest issues are dissolved chemicals, not mineral scale.
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Reverse osmosis for 1,4-dioxane and PFAS
Standard carbon filtration struggles with 1,4-dioxane. Reverse osmosis and advanced treatment are the more reliable way to reduce it, along with PFAS, at your own tap.
Learn more -
Whole house filtration
For a household drawing from an aquifer well district with radium or PFAS findings like Freeport's, whole house treatment covers every fixture, not just the kitchen sink.
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Free water test
Since Nassau's supply is groundwater, not a uniform reservoir blend, results vary district by district, and a free test tells you exactly what your own address is drawing.
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Nassau County's water, at a glance
Groundwater carries a different set of issues than our Hudson Valley counties.
| Category | What we typically find |
|---|---|
| Supplier | 50+ water companies and districts on the shared Magothy aquifer; Village of Freeport (45,000 served) is one example |
| Source type | Groundwater, pumped from 1,100+ large-capacity wells, not a surface reservoir |
| Typical hardness | Independent estimates put it around 28 ppm ('soft'), unverified at the utility level |
| Documented issues | 1,4-dioxane across dozens of districts; Freeport testing showed PFHxS, PFOA and radium above health guidelines |
| Common home symptoms | Less scale than our Hudson Valley counties, more concern around taste, odor and dissolved contaminants than mineral hardness |
What a visit in Nassau County looks like
Nassau County appointments are typically scheduled within the same week.
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1
Call or book online
Tell us your town and what you're noticing about the water.
5 minutes
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2
In-home water test
A technician tests for hardness, 1,4-dioxane-relevant indicators, PFAS-family compounds and more.
45 to 60 minutes
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3
Plain-language results
We explain what we found in your specific water before recommending anything.
Same visit
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4
A system built for your results
Nassau County appointments are typically available within the same week.
Usually within the same week
What our customers say
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Our water system has completely transformed over the past year. We had issues with old pipes causing chlorine taste, bacteria, PFAS, and heavy metals. Lucia identified all our water problems and provided the perfect solution for our home.
T Tom Bennett Homeowner -
From the free water analysis to the final installation, everything was fast and professional. The team's expert attention to detail made the whole process smooth and stress-free. Very satisfied with the service!
A Alex Rony Homeowner -
I had doubts about installing a water system, but after calling and getting a free analysis at my home, all my concerns were addressed. Lucia was very professional and patient in explaining everything. Implementation was quick and now we enjoy pure water every day!
E Esther Howard Business Owner
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Is Nassau County water actually well water?
Yes, in the sense that matters: the public supply is pumped from more than 1,100 wells in the Magothy aquifer rather than a river or reservoir, even though almost every Nassau home is connected to a public system, not a private well.
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What is 1,4-dioxane and is it in my water?
It's an industrial solvent and likely human carcinogen found across dozens of Long Island water districts, and it is not something a basic carbon filter removes well, which is why reverse osmosis or advanced treatment matters more here than in our other counties.
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Is Nassau County water hard?
Typically not as hard as our Hudson Valley counties. Independent estimates put it around 28 ppm, in the soft range, since groundwater generally carries less dissolved mineral than a surface reservoir supply.
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Do I need a water softener if I live in Nassau County?
Usually less urgently than in Rockland, Westchester or Bergen. Nassau's biggest documented issues are 1,4-dioxane and PFAS-family compounds, so reverse osmosis or whole house filtration typically matters more here than softening.
More ways we can help nearby
Ready for your free water test in Nassau County?
One visit tells you what's actually in your aquifer-sourced water, from 1,4-dioxane to PFAS-family compounds.
- Free in-home testing
- No obligation
- Bilingual service
- 1,4-dioxane reduction