Mastic Beach Water Hardness & Quality Report (2026)
Water Hardness
9.9 grains per gallon
Source
reservoir
pH Level
8.2
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
439.8 mg/L
Est. Daily Cost
$0.45
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 Mastic Beach, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Mastic Beach | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4 yrs | 8.5 yrs | -53% |
| Washing Machine | 7.3 yrs | 12 yrs | -39% |
| Water Heater | 8.8 yrs | 15 yrs | -41% |
Regional Water Comparison
How Mastic Beach compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mastic Beach, New York | 169.5 mg/L | 8.1 ppt | 🟠 Hard | reservoir |
| Mastic, New York | 169.5 mg/L | 8.1 ppt | 🟠 Hard | reservoir |
| Shirley, New York | 121 mg/L | 5.8 ppt | 🟠 Hard | reservoir |
| Manorville, New York | 152 mg/L | 7.3 ppt | 🟠 Hard | reservoir |
| Ridge, New York | 164.5 mg/L | 7.8 ppt | 🟠 Hard | reservoir |
National Benchmark
How Mastic Beach compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mastic Beach | 169.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mastic Beach's Water Unique?
Local geology and source profile
Mastic Beach, New York, in Suffolk County — an unincorporated Suffolk County community adjacent to Shirley and East Moriches on the south shore of Long Island — receives its water from the Suffolk County Water Authority (SCWA), drawing from the Long Island Aquifer (Suffolk County) through the eastern Long Island distribution.
The hard 169.5 mg/L hardness and TDS of 439.8 mg/L are substantially harder than the western Nassau County communities (North New Hyde Park: 69.5 mg/L) — reflecting the central-eastern Suffolk County Long Island Aquifer's more mineralized character, possibly including deeper Cretaceous calcareous aquifer contribution or concentrated saline zone proximity. The Long Island Aquifer at Suffolk County is developed in Pleistocene glacial outwash (slightly calcareous, from New England crystalline), Cretaceous Magothy Aquifer (slightly calcareous — primary hardness contributor at the deeper Suffolk zone), and local coastal calcareous input.
At 169.5 mg/L, Mastic Beach's water is hard — scale builds steadily in kettles and appliances, dishwashers benefit from rinse aid, and water heaters should be descaled annually. Monthly descaling is recommended. The PFAS level of 8.1 ppt is elevated — Brookhaven National Laboratory (Upton, Suffolk County — AFFF and industrial chemical legacy), Gabreski Airport (Suffolk County — AFFF), and the central Suffolk County PFAS industrial corridor contribute to Mastic Beach's elevated readings.
Geology & Source: Mastic Beach in Suffolk County draws from the Suffolk County Water Authority on the Long Island Aquifer (Suffolk County, eastern Long Island) — the Long Island Aquifer at Suffolk County is developed in Pleistocene glacial outwash and Cretaceous Magothy Aquifer sand (slightly calcareous) — New York Suffolk County Long Island Pleistocene-Cretaceous sandy aquifer produces hard water at 169.5 mg/L with TDS 439.8 mg/L.