Mount Sinai Water Hardness & Quality Report (2026)
Water Hardness
7.4 grains per gallon
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
271.5 mg/L
Est. Daily Cost
$0.34
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 Mount Sinai, your appliances are currently losing 17% efficiency due to mineral buildup.
| Appliance | In Mount Sinai | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.4 yrs | 8.5 yrs | -36% |
| Washing Machine | 8.9 yrs | 12 yrs | -26% |
| Water Heater | 10.5 yrs | 15 yrs | -30% |
Regional Water Comparison
How Mount Sinai compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mount Sinai, New York | 126.5 mg/L | 6.1 ppt | 🟠 Hard | reservoir |
| Miller Place, New York | 91.5 mg/L | 4.4 ppt | 🟡 Moderately Hard | reservoir |
| Terryville, New York | 125 mg/L | 6 ppt | 🟠 Hard | reservoir |
| Setauket-East Setauket, New York | 118 mg/L | 5.7 ppt | 🟡 Moderately Hard | reservoir |
| East Setauket, New York | 177 mg/L | 8.4 ppt | 🟠 Hard | reservoir |
National Benchmark
How Mount Sinai compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mount Sinai | 126.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mount Sinai's Water Unique?
Local geology and source profile
Mount Sinai, New York, in Suffolk County — a Suffolk County hamlet adjacent to Port Jefferson and Miller Place on the north shore of Long Island — receives its water from the Suffolk County Water Authority (SCWA), drawing from the Long Island aquifer system — specifically the Upper Glacial, Magothy, and Lloyd aquifers beneath north Long Island — through the north Suffolk County distribution.
The moderately hard 126.5 mg/L hardness and TDS of 271.5 mg/L are somewhat elevated for Long Island's typically soft aquifer water — north shore Suffolk communities often show slightly higher mineral content due to local geological variations and proximity to Sound shore deposits (compare Port Jefferson NY: 124/268 in Suffolk County comparable; Miller Place NY: 128/274 in Suffolk County comparable; Mount Sinai consistent moderate from the same north Suffolk County Long Island aquifer). The Long Island aquifer at Suffolk County — Pleistocene Magothy Aquifer (insoluble — primary contributor), Cretaceous Jameco Formation (insoluble — secondary contributor), and Holocene Long Island Sound shore deposits (slightly calcareous — TDS contributor).
At 126.5 mg/L with TDS 272, Mount Sinai's water is moderately hard — mild scale buildup in appliances over time. Semi-annual descaling is appropriate. The PFAS level of 6.1 ppt warrants a certified drinking water filter — Suffolk County Long Island has widespread PFAS contamination from industrial and military sources. A reverse osmosis or certified carbon block filter is recommended for drinking water.
Geology & Source: Mount Sinai in Suffolk County draws from the Suffolk County Water Authority on the Long Island aquifer (Suffolk County, north Long Island, New York) — the Long Island aquifer at Suffolk County is developed in Pleistocene Magothy Aquifer (insoluble) and Cretaceous Jameco Formation (insoluble) — New York Suffolk County Long Island Magothy Pleistocene aquifer produces moderately hard water at 126.5 mg/L with TDS 271.5 mg/L.