Great Neck Water Hardness & Quality Report (2026)
Water Hardness
5.1 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
151.7 mg/L
Est. Daily Cost
$0.23
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 Great Neck, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Great Neck | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.7 yrs | 8.5 yrs | -21% |
| Washing Machine | 10.4 yrs | 12 yrs | -13% |
| Water Heater | 12.1 yrs | 15 yrs | -19% |
Regional Water Comparison
How Great Neck compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Great Neck, New York | 87 mg/L | 4.2 ppt | 🟡 Moderately Hard | reservoir |
| Douglaston, New York | 140.5 mg/L | 6.8 ppt | 🟠 Hard | reservoir |
| Little Neck, New York | 103.5 mg/L | 5 ppt | 🟡 Moderately Hard | reservoir |
| Port Washington, New York | 83 mg/L | 4.1 ppt | 🟡 Moderately Hard | reservoir |
| Bayside, New York | 171 mg/L | 8.2 ppt | 🟠 Hard | reservoir |
National Benchmark
How Great Neck compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Great Neck | 87 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Great Neck's Water Unique?
Local geology and source profile
Great Neck, New York, in Nassau County — a Nassau County peninsula community adjacent to Manhasset and Port Washington on the north shore of Long Island — receives its water from the Great Neck Water Authority, drawing from the Lloyd Sand and Magothy aquifers through the north Long Island distribution.
The moderately hard 87 mg/L hardness and TDS of 151.7 mg/L reflect the Nassau County supply's moderate Long Island north shore aquifer character — the Cretaceous Lloyd Sand and Pleistocene Upper Glacial aquifer are sandy-slightly calcareous formations in the Long Island Coastal Plain; the Great Neck wells on the north shore draw from relatively clean shallow aquifer zones with lower mineral concentration than the south shore Long Island supply (compare Manhasset NY: 84/144 in Nassau County comparable; Port Washington NY: 89/158 in Nassau County comparable; Great Neck consistent moderate from the same Nassau County Magothy aquifer Cretaceous supply). The Lloyd/Magothy aquifer system — Cretaceous Lloyd Sand (sandy insoluble — primary dilutant), Pleistocene Upper Glacial aquifer (sandy calcareous — primary hardness contributor), and Quaternary Long Island glaciolacustrine deposit (slightly calcareous — TDS contributor).
At 87 mg/L with TDS 152, Great Neck's water is moderately hard — mild scale buildup. Semi-annual descaling is appropriate. The PFAS level of 4.2 ppt is moderate — a certified drinking water filter provides added protection. Review the Great Neck Water Authority's annual water quality report.
Geology & Source: Great Neck in Nassau County draws from the Great Neck Water on the Magothy/Lloyd aquifer (Nassau County, north Long Island) — the Long Island Coastal Plain at Nassau County draws from Cretaceous Lloyd Sand (sandy insoluble) and Pleistocene Upper Glacial aquifer (sandy calcareous) — New York Nassau County Magothy aquifer Cretaceous supply produces moderately hard water at 87 mg/L with TDS 151.7 mg/L.