Greenlawn Water Hardness & Quality Report (2026)
Water Hardness
5.5 grains per gallon
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
171.8 mg/L
Est. Daily Cost
$0.25
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 Greenlawn, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In Greenlawn | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.5 yrs | 8.5 yrs | -24% |
| Washing Machine | 10.1 yrs | 12 yrs | -16% |
| Water Heater | 11.8 yrs | 15 yrs | -21% |
Regional Water Comparison
How Greenlawn compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Greenlawn, New York | 94.5 mg/L | 4.6 ppt | 🟡 Moderately Hard | reservoir |
| East Northport, New York | 174 mg/L | 8.3 ppt | 🟠 Hard | reservoir |
| Huntington Station, New York | 80.5 mg/L | 3.9 ppt | 🟡 Moderately Hard | reservoir |
| Huntington, New York | 80 mg/L | 3.9 ppt | 🟡 Moderately Hard | reservoir |
| Dix Hills, New York | 134.5 mg/L | 6.4 ppt | 🟠 Hard | reservoir |
National Benchmark
How Greenlawn compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Greenlawn | 94.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Greenlawn's Water Unique?
Local geology and source profile
Greenlawn, New York, in Suffolk County — a Suffolk County hamlet adjacent to Huntington and Centerport on north-central Long Island — receives its water from the Suffolk County Water Authority, drawing from the Long Island Glacial Aquifer (Suffolk County) through the north Long Island distribution.
The moderately hard 94.5 mg/L hardness and TDS of 171.8 mg/L reflect the north Suffolk County Long Island supply's moderate calcareous character — typical of Suffolk County glacial aquifer communities (Stony Brook: 87.5 mg/L; Arverne: ~90 mg/L) reflecting the Pleistocene Ronkonkoma glacial outwash calcareous moraine deposits. The Long Island Glacial Aquifer at north Suffolk County — Pleistocene Ronkonkoma Moraine glacial outwash (slightly calcareous — primary hardness contributor from calcareous till), Cretaceous Magothy Formation (insoluble — dilutant), and Cretaceous Lloyd Sand (insoluble — deep dilutant).
At 94.5 mg/L, Greenlawn's water is moderately hard — light scale forms slowly in appliances, dishwashers benefit from rinse aid, and faucet aerators need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 4.6 ppt warrants a certified drinking water filter — the Suffolk County north Long Island industrial corridor and the Long Island legacy PFAS sites contribute to Greenlawn's readings.
Geology & Source: Greenlawn in Suffolk County draws from the Suffolk County Water Authority on the Long Island Glacial Aquifer (Suffolk County, north Long Island, New York) — the aquifer is developed in Pleistocene Ronkonkoma glacial outwash (slightly calcareous) and Cretaceous Magothy Formation (insoluble) — New York Suffolk County Long Island Pleistocene glacial aquifer produces moderately hard water at 94.5 mg/L with TDS 171.8 mg/L.