Seaford Water Hardness & Quality Report (2026)
Water Hardness
0.6 grains per gallon
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
180.3 mg/L
Est. Daily Cost
$0.03
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 Seaford, your appliances are currently losing 1% efficiency due to mineral buildup.
| Appliance | In Seaford | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 9.2 yrs | 8.5 yrs | — |
| Washing Machine | 13.2 yrs | 12 yrs | — |
| Water Heater | 15.2 yrs | 15 yrs | — |
Regional Water Comparison
How Seaford compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Seaford, New York | 10.95 mg/L | 4.7 ppt | 🟢 Soft | reservoir |
| Massapequa, New York | ≈ 0–60 mg/L | 0 ppt | 🟢 Soft | groundwater |
| Wantagh, New York | 10.9 mg/L | 5.8 ppt | 🟢 Soft | reservoir |
| North Wantagh, New York | 10.75 mg/L | 3.7 ppt | 🟢 Soft | reservoir |
| Massapequa Park, New York | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Seaford compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Seaford | 10.95 mg/L | 🟢 None |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Seaford's Water Unique?
Local geology and source profile
Seaford, New York's water originates from the Long Island aquifer system, specifically glacial deposits of sand and gravel from the Pleistocene epoch. This supply is managed by American Water Company through its Merrick Operations District. The water undergoes treatment before distribution to residents. The utility draws from local groundwater sources, with customer service accessible via phone. This groundwater originates from Long Island's glacial aquifer, a vast underground reservoir composed mainly of Pleistocene-age sand and gravel.
These unconsolidated sediments rest atop older Cretaceous-age clay and sand formations. The underlying geology is characterized by siliciclastic rocks, meaning it's largely composed of non-carbonate materials like sand and clay. With minimal presence of limestone or dolomite, the dissolution of hardness-causing minerals such as calcium and magnesium is naturally limited. This geological makeup is responsible for the soft water supply characteristic of Long Island's hydrogeology.
Because the water is soft, homeowners in Seaford typically won't face significant scale buildup in their pipes, water heaters, or appliances. You'll find that soaps and detergents work more efficiently, often without the need for extra softening agents. Most household appliances should operate without the added maintenance demands that come with harder water. While a water softener isn't usually necessary, some residents might opt for one based on personal preference or a desire to further extend appliance life. The water meets all EPA safety standards.
Geology & Source: Long Island glacial aquifer system; Pleistocene sand and gravel over Cretaceous clay and sand; siliciclastic sediments yield soft water
Other New York Water Reports
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Frequently Asked Questions
Is Seaford's water safe to drink?
Do I need a water softener in Seaford?
How does Seaford compare to the USA average?
Data Sources & Methodology
Water quality data for Seaford 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.