Rocky Point Water Hardness & Quality Report (2026)
Water Hardness
3.9 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
102.3 mg/L
Est. Daily Cost
$0.18
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 Rocky Point, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Rocky Point | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.4 yrs | 8.5 yrs | -13% |
| Washing Machine | 11.1 yrs | 12 yrs | -8% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Rocky Point compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rocky Point, New York | 67 mg/L | 3.3 ppt | 🟡 Moderately Hard | reservoir |
| Ridge, New York | 164.5 mg/L | 7.8 ppt | 🟠 Hard | reservoir |
| Miller Place, New York | 91.5 mg/L | 4.4 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 |
National Benchmark
How Rocky Point compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rocky Point | 67 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Rocky Point home
Shop water softeners on Amazon.com →
What Makes Rocky Point's Water Unique?
Local geology and source profile
Rocky Point, New York, in Suffolk County — a Suffolk County community adjacent to Ridge and Shoreham on the north shore of Long Island — receives its water from the Suffolk County Water Authority (SCWA), drawing from the Long Island aquifer system (Suffolk County) through the north Long Island distribution.
The moderately soft 67 mg/L hardness and TDS of 102.3 mg/L are much softer than the Nassau County Long Island communities (New Cassel: 155 mg/L) — reflecting Rocky Point's Suffolk County north shore position drawing from the shallower and less mineralized glaciofluvial outwash aquifer layers. The Suffolk County Long Island aquifer at Rocky Point — Pleistocene Ronkonkoma Moraine outwash (slightly calcareous — minor contributor), Pleistocene Harbor Hill Moraine (slightly calcareous), and Cretaceous Magothy Formation (very slightly calcareous — primary deep aquifer supply, naturally soft).
At 67 mg/L, Rocky Point's water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 3.3 ppt is low — the Suffolk County north Long Island rural-residential corridor has limited adjacent heavy AFFF military PFAS sources relative to Nassau County.
Geology & Source: Rocky Point in Suffolk County draws from the Suffolk County Water Authority on Long Island groundwater (Suffolk County, Long Island, New York) — the Long Island aquifer is developed in Pleistocene Ronkonkoma Moraine outwash (slightly calcareous) and Cretaceous Magothy Formation — New York Suffolk County Long Island Pleistocene glaciofluvial Cretaceous aquifer produces moderately soft water at 67 mg/L with TDS 102.3 mg/L.