Lynbrook Water Hardness & Quality Report (2026)
Water Hardness
8.1 grains per gallon
Source
reservoir
pH Level
7.9
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
314.1 mg/L
Est. Daily Cost
$0.37
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 Lynbrook, your appliances are currently losing 18% efficiency due to mineral buildup.
| Appliance | In Lynbrook | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5 yrs | 8.5 yrs | -41% |
| Washing Machine | 8.5 yrs | 12 yrs | -29% |
| Water Heater | 10.1 yrs | 15 yrs | -33% |
Regional Water Comparison
How Lynbrook compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lynbrook, New York | 138 mg/L | 6.6 ppt | 🟠 Hard | reservoir |
| Rockville Centre, New York | 65 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
| Oceanside, New York | 90 mg/L | 4.4 ppt | 🟡 Moderately Hard | reservoir |
| Valley Stream, New York | 72 mg/L | 3.6 ppt | 🟡 Moderately Hard | reservoir |
| North Valley Stream, New York | 74 mg/L | 3.6 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Lynbrook compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lynbrook | 138 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lynbrook's Water Unique?
Local geology and source profile
Lynbrook, New York, in Nassau County — a Nassau County incorporated village in the Town of Hempstead in the south Shore corridor adjacent to Valley Stream and Malverne, a Long Island Railroad commuter suburb — receives its municipal water from the Village of Lynbrook Water Department or Nassau County DPW, which draws from the Upper Glacial Aquifer and the Magothy Aquifer through production wells in the Lynbrook-Malverne area of south Nassau County.
The moderately hard 138 mg/L hardness and TDS of 314.1 mg/L are consistent with the Nassau County south shore aquifer character — softer than the deeper Magothy zones in central Nassau (North Bellmore: 174 mg/L, TDS 461) but harder than the soft Wanaque-fed communities (Lyndhurst NJ: 39 mg/L). Lynbrook's Nassau County south shore wells access the intermediate Upper Glacial-Magothy blend at shallow-to-moderate depth, producing the moderately hard water characteristic of the southwest Nassau County south shore zone.
At 138 mg/L, Lynbrook'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 6.6 ppt warrants a certified drinking water filter — the Grumman Bethpage PFAS plume (Nassau County — a documented major PFAS source in the Nassau County aquifer system), Mitchel Field legacy, and the Long Island defense-aviation PFAS complex contribute to Lynbrook's PFAS readings.
Geology & Source: Lynbrook in Nassau County draws from the Village of Lynbrook Water Department or Nassau County DPW on the Upper Glacial Aquifer and Magothy Aquifer (Long Island south shore) — Nassau County's aquifer accesses Pleistocene outwash and Cretaceous Magothy Formation calcareous sand — Long Island south shore aquifer produces moderately hard water at 138 mg/L with TDS 314 mg/L in this Nassau County New York village.