Lake Grove Water Hardness & Quality Report (2026)
Water Hardness
10.3 grains per gallon
Source
reservoir
pH Level
8.3
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
473.1 mg/L
Est. Daily Cost
$0.47
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 Lake Grove, your appliances are currently losing 24% efficiency due to mineral buildup.
| Appliance | In Lake Grove | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.8 yrs | 8.5 yrs | -55% |
| Washing Machine | 7.1 yrs | 12 yrs | -41% |
| Water Heater | 8.5 yrs | 15 yrs | -43% |
Regional Water Comparison
How Lake Grove compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lake Grove, New York | 177 mg/L | 8.4 ppt | 🟠 Hard | reservoir |
| Centereach, New York | 112.5 mg/L | 5.4 ppt | 🟡 Moderately Hard | reservoir |
| Lake Ronkonkoma, New York | 179 mg/L | 8.5 ppt | 🟠 Hard | reservoir |
| Nesconset, New York | 153.5 mg/L | 7.3 ppt | 🟠 Hard | reservoir |
| Ronkonkoma, New York | 70.5 mg/L | 3.4 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Lake Grove compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lake Grove | 177 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lake Grove's Water Unique?
Local geology and source profile
Lake Grove, New York, in Suffolk County — a Suffolk County incorporated village adjacent to Centereach and Stony Brook in central Long Island — receives its water from New York American Water or Suffolk County Water Authority, drawing from the Long Island Aquifer system through the central Long Island distribution.
The hard 177 mg/L hardness and TDS of 473.1 mg/L reflect the Suffolk County Long Island Aquifer supply's hard character — the Cretaceous Magothy Formation contains slightly calcareous clay and sand, while long residence time in the Long Island Aquifer concentrates dissolved minerals including iron, manganese, and naturally occurring nitrates (compare Centereach NY: 173/462 in Suffolk County comparable; Stony Brook NY: 180/484 in Suffolk County comparable; Lake Grove consistent hard from the same Suffolk County Long Island Aquifer Cretaceous supply). The Long Island Aquifer at Suffolk County — Cretaceous Magothy Formation (slightly calcareous — primary hardness contributor), Cretaceous Lloyd Sand (insoluble — secondary dilutant), and Quaternary Long Island glacial deposits (calcareous — TDS contributor).
At 177 mg/L with TDS 473, Lake Grove's water is hard — scale builds in appliances. Quarterly descaling is appropriate. The PFAS level of 8.4 ppt is elevated — a certified drinking water filter with PFAS removal is recommended — the Suffolk County Long Island industrial and former military (Brookhaven National Laboratory area, Grumman/Northrop legacy) sources contribute to Lake Grove's elevated PFAS readings.
Geology & Source: Lake Grove in Suffolk County draws from the New York American Water on the Long Island Aquifer (Suffolk County, central Long Island, New York) — the Long Island aquifer draws from Cretaceous Magothy Formation (slightly calcareous) and Cretaceous Lloyd Sand (insoluble) — New York Suffolk County Long Island Aquifer Cretaceous supply produces hard water at 177 mg/L with TDS 473.1 mg/L.