Seaford Water Hardness & Quality Report (2026)
Water Hardness
5.7 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
$0.26
energy & soap waste
Source: USGS Water Quality Portal · 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 13% efficiency due to mineral buildup.
| Appliance | In Seaford | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.4 yrs | 8.5 yrs | -25% |
| Washing Machine | 10 yrs | 12 yrs | -17% |
| Water Heater | 11.7 yrs | 15 yrs | -22% |
Regional Water Comparison
How Seaford compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Seaford, New York | 97.5 mg/L | 4.7 ppt | 🟡 Moderately Hard | reservoir |
| Massapequa, New York | 168 mg/L | 8 ppt | 🟠 Hard | reservoir |
| Wantagh, New York | 121 mg/L | 5.8 ppt | 🟠 Hard | reservoir |
| Massapequa Park, New York | 168 mg/L | 8 ppt | 🟠 Hard | reservoir |
| Bellmore, New York | 78.5 mg/L | 3.9 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Seaford compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Seaford | 97.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Seaford's Water Unique?
Local geology and source profile
Seaford, New York, in Nassau County — a Nassau County village adjacent to Wantagh and Massapequa on the south shore of Long Island — receives its water from the Nassau County Department of Public Works or Nassau County Water Authority, drawing from the Long Island Aquifer (Magothy Formation, south Nassau County) through the south Long Island distribution.
The moderately soft 97.5 mg/L hardness and TDS of 180.3 mg/L are softer than the central Nassau County communities (Westbury: 158.5 mg/L) — reflecting the south shore Nassau Magothy's slightly less concentrated calcareous character in the shallow South Shore zone. The Long Island Aquifer (Magothy) at south Nassau County is developed in Cretaceous Magothy Formation (calcareous sand — moderate carbonate content), Pleistocene South Shore outwash (slightly calcareous), and upper Cretaceous Lloyd Sand (slightly calcareous).
At 97.5 mg/L, Seaford's water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 4.7 ppt warrants a certified drinking water filter — the Nassau County south Long Island Grumman-Bethpage PFAS plume (the largest Long Island PFAS source), the Republic Airport aviation PFAS legacy, and the south Nassau PFAS background contribute to Seaford's readings.
Geology & Source: Seaford in Nassau County draws from the Nassau County Department of Public Works on the Long Island Aquifer (Nassau County, south Long Island) — the Long Island Aquifer at south Nassau is developed in Cretaceous Magothy Formation (calcareous) and Pleistocene South Shore outwash — New York Nassau County Long Island Aquifer south shore system produces moderately soft water at 97.5 mg/L with TDS 180.3 mg/L in this Nassau County New York village.