Syosset Water Hardness & Quality Report (2026)
Water Hardness
6.5 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
222.5 mg/L
Est. Daily Cost
$0.30
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 Syosset, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Syosset | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.9 yrs | 8.5 yrs | -31% |
| Washing Machine | 9.5 yrs | 12 yrs | -21% |
| Water Heater | 11.1 yrs | 15 yrs | -26% |
Regional Water Comparison
How Syosset compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Syosset, New York | 111.5 mg/L | 5.4 ppt | 🟡 Moderately Hard | reservoir |
| Jericho, New York | 124.5 mg/L | 6 ppt | 🟠 Hard | reservoir |
| Plainview, New York | 65.5 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
| Hicksville, New York | 151.5 mg/L | 7.3 ppt | 🟠 Hard | reservoir |
| Bethpage, New York | 90 mg/L | 4.4 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Syosset compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Syosset | 111.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Syosset's Water Unique?
Local geology and source profile
Syosset, New York, in Nassau County — an unincorporated Nassau County community adjacent to Oyster Bay and Woodbury, in the north-central Nassau County suburban corridor at the Long Island Expressway and the Seaford-Oyster Bay Expressway interchange — receives its municipal water from Nassau County DPW, drawing from the Upper Glacial Aquifer through production wells in north-central Nassau County.
The moderately hard 111.5 mg/L hardness and TDS of 222.5 mg/L are intermediate between the very soft north Nassau Upper Glacial readings and the harder south Nassau Magothy readings — reflecting the north-central Nassau Upper Glacial Aquifer's Pleistocene Harbor Hill Moraine outwash character at somewhat more mineralized depths or zones than the shallow Upper Glacial at Ronkonkoma. The Syosset area wells in the Upper Glacial Aquifer near the Harbor Hill Moraine produce moderate hardness, reflecting the calcareous Pleistocene moraine material in the north-central Nassau zone.
At 111.5 mg/L, Syosset's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 5.4 ppt warrants a certified drinking water filter — the Grumman Bethpage PFAS plume (Nassau County — the Bethpage PFAS plume extends north into the central Nassau County aquifer zone), Mitchel Field legacy, and the Long Island aviation PFAS complex contribute to Syosset's readings.
Geology & Source: Syosset in Nassau County draws from Nassau County DPW on the Upper Glacial Aquifer (north-central Nassau County, Long Island) — the Upper Glacial Aquifer consists of Pleistocene Harbor Hill Moraine outwash sand (Syosset-Woodbury area) — Long Island north-central Nassau Pleistocene moraine outwash aquifer produces moderately hard water at 111.5 mg/L with TDS 223 mg/L in this Nassau County New York community.