Franklin Square Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
groundwater
pH Level
8
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
332.7 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Franklin Square, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Franklin Square | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Franklin Square compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Franklin Square, New York | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | groundwater |
| West Hempstead, New York | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | groundwater |
| Floral Park, New York | ≈ 120–179 mg/L | 5.9 ppt | 🟠 Hard | reservoir |
| North Valley Stream, New York | 17 mg/L | 3.6 ppt | 🟢 Soft | reservoir |
| Elmont, New York | ≈ 180+ mg/L | 4 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Franklin Square compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Franklin Square | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Franklin Square's Water Unique?
Local geology and source profile
Franklin Square Water District (FSWD) serves the Franklin Square area of Nassau County, New York, drawing its supply from local groundwater wells. The utility operates multiple supply wells and delivers treated water to residential and commercial customers throughout the service area. FSWD publishes annual Consumer Confidence Reports detailing water quality testing and treatment processes, and has been constructing Advanced Oxidation Process (AOP) treatment facilities to address emerging contaminants. The 2022 Water Quality Report identified 1,4-dioxane at 1.1 ppb, slightly above New York State's maximum contaminant level, with remediation underway.
The Franklin Square water supply originates from groundwater aquifers underlying Long Island, composed of Quaternary glacial deposits overlying Cretaceous-age sand and clay formations. These geological layers contain dissolved minerals — primarily calcium and magnesium carbonates — that accumulate as water percolates through the sediments. The marine origin and mineral-rich character of Long Island's subsurface geology naturally produce a hard water supply, typical of the region.
At the hard hardness level, residents may experience scale buildup on fixtures, reduced soap lather, and decreased efficiency in water heaters and dishwashers; hard water can shorten appliance lifespan and increase maintenance needs. Regular descaling of showerheads and faucets is recommended, and homeowners benefit from point-of-use filters or whole-house water softeners, particularly for high-use appliances. Tap water meets all EPA Maximum Contaminant Level Goals, with over 100 contaminants tested within safe levels, and the water is considered safe to drink.
Geology & Source: Nassau County, Long Island; Quaternary glacial deposits overlying Cretaceous sand and clay formations; calcium and magnesium from marine sediments produce hard supply typical of Long Island hydrogeology
Other New York Water Reports
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Frequently Asked Questions
Is Franklin Square's water safe to drink?
Do I need a water softener in Franklin Square?
How does Franklin Square compare to the USA average?
Data Sources & Methodology
Water quality data for Franklin Square is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.