Melville Water Hardness & Quality Report (2026)
Water Hardness
4 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
107.3 mg/L
Est. Daily Cost
$0.18
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 Melville, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Melville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Melville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Melville, New York | 69 mg/L | 3.4 ppt | 🟡 Moderately Hard | reservoir |
| Plainview, New York | 65.5 mg/L | 3.2 ppt | 🟡 Moderately 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 |
| South Farmingdale, New York | 157 mg/L | 7.5 ppt | 🟠 Hard | reservoir |
National Benchmark
How Melville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Melville | 69 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Melville's Water Unique?
Local geology and source profile
Melville, New York, in Suffolk County — an unincorporated Suffolk County community adjacent to Huntington and Dix Hills, in the central-north Suffolk County corridor at the Long Island Expressway corridor — receives its municipal water from the Suffolk County Water Authority (SCWA), drawing from the Upper Glacial Aquifer through production wells beneath central Suffolk County.
The soft 69 mg/L hardness and low TDS of 107.3 mg/L reflect the central Suffolk County Upper Glacial Aquifer's Pleistocene outwash character — essentially the same as Ronkonkoma (70.5 mg/L) in the same aquifer zone. The Upper Glacial Aquifer beneath Melville consists of Wisconsin-age glaciofluvial outwash sand and gravel deposited on the Harbor Hill Moraine (north central Long Island terminal moraine) and the Ronkonkoma Moraine system — all insoluble Pleistocene outwash, producing the soft, low-TDS water characteristic of central Suffolk County.
At 69 mg/L, Melville's water is soft — essentially no scale forms, soap lathers abundantly, and appliances maintain good efficiency. Annual descaling is sufficient. The PFAS level of 3.4 ppt warrants a certified drinking water filter — Grumman Bethpage (Northrop Grumman former aircraft plant — PFAS manufacturing legacy in north Nassau-south Suffolk), Republic Airport (Farmingdale — AFFF use), and the central Long Island defense-aviation PFAS complex contribute to Melville's readings.
Geology & Source: Melville in Suffolk County draws from Suffolk County Water Authority on the Upper Glacial Aquifer (central Suffolk County, Long Island) — the Upper Glacial Aquifer consists of Pleistocene Harbor Hill and Ronkonkoma Moraine outwash sand — Long Island central Suffolk Pleistocene outwash aquifer produces soft water at 69 mg/L with TDS 107 mg/L in this Suffolk County New York community.