Miller Place Water Hardness & Quality Report (2026)
Water Hardness
5.3 grains per gallon
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
163.1 mg/L
Est. Daily Cost
$0.24
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 Miller Place, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Miller Place | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.6 yrs | 8.5 yrs | -22% |
| Washing Machine | 10.2 yrs | 12 yrs | -15% |
| Water Heater | 11.9 yrs | 15 yrs | -21% |
Regional Water Comparison
How Miller Place compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Miller Place, New York | 91.5 mg/L | 4.4 ppt | 🟡 Moderately Hard | reservoir |
| Rocky Point, New York | 67 mg/L | 3.3 ppt | 🟡 Moderately Hard | reservoir |
| Coram, New York | 71.5 mg/L | 3.5 ppt | 🟡 Moderately Hard | reservoir |
| Selden, New York | 102 mg/L | 4.9 ppt | 🟡 Moderately Hard | reservoir |
| Setauket-East Setauket, New York | 118 mg/L | 5.7 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Miller Place compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Miller Place | 91.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Miller Place's Water Unique?
Local geology and source profile
Miller Place, New York, in Suffolk County — a Suffolk County hamlet adjacent to Mount Sinai and Port Jefferson on the north shore of Long Island — receives its water from the Suffolk County Water Authority, drawing from the Long Island aquifer (Suffolk County) through the north shore Long Island distribution.
The soft 91.5 mg/L hardness and TDS of 163.1 mg/L reflect the north shore Long Island Suffolk County aquifer supply's moderately soft character — softer than south shore Patchogue (138.5/314.5) because the north shore position in the Ronkonkoma Aquifer contacts less coastal marine calcareous input (compare Patchogue NY: 138.5/314.5 south shore harder; Miller Place softer from the north shore Long Island aquifer position). The Long Island aquifer at Suffolk County — Pleistocene Ronkonkoma Aquifer (slightly calcareous — primary hardness contributor), Miocene Gardiners Clay (insoluble — dilutant), and Holocene north shore glacial outwash (insoluble — secondary dilutant).
At 91.5 mg/L, Miller Place's water is soft — scale forms slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 4.4 ppt warrants a certified drinking water filter — the Suffolk County Long Island industrial and military corridor contribute to Miller Place's elevated readings.
Geology & Source: Miller Place in Suffolk County draws from the Suffolk County Water Authority on the Long Island aquifer (Suffolk County, north shore Long Island, New York) — the Long Island aquifer at Suffolk County is developed in Pleistocene Ronkonkoma Aquifer (slightly calcareous) and Miocene Gardiners Clay (insoluble) — New York Suffolk County Long Island aquifer Pleistocene north shore supply produces soft water at 91.5 mg/L with TDS 163.1 mg/L.