Mastic 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
439.7 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, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Mastic | 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 compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mastic, New York | 169.5 mg/L | 8.1 ppt | 🟠 Hard | reservoir |
| Shirley, New York | 121 mg/L | 5.8 ppt | 🟠 Hard | reservoir |
| Mastic Beach, New York | 169.5 mg/L | 8.1 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 compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mastic | 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's Water Unique?
Local geology and source profile
Mastic, New York, in Suffolk County — an unincorporated Suffolk County community adjacent to Shirley and Mastic Beach near Smith Point in east-central Suffolk County, Long Island — receives its water from the Suffolk County Water Authority (SCWA), drawing from the Long Island Aquifer (Magothy aquifer system, east-central Suffolk County) through the east Long Island distribution.
The hard 169.5 mg/L hardness and elevated TDS of 439.7 mg/L are significantly harder than the central Suffolk SCWA communities (Farmingville: 101 mg/L; Coram: ~100 mg/L) — reflecting the east-central Suffolk County Long Island Aquifer's more concentrated calcareous character at this deeper penetration zone. The Long Island Aquifer (Magothy system) at Mastic is developed in Cretaceous Magothy Formation (calcareous sand — higher carbonate content at this east-central Suffolk position), Pleistocene Ronkonkoma outwash (slightly calcareous), and deeper Cretaceous Lloyd Sand (calcareous). The deeper Magothy calcareous zone at east-central Suffolk produces the harder Mastic supply.
At 169.5 mg/L, Mastic'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 warrants a certified reverse osmosis drinking water filter — the Suffolk County Brookhaven National Laboratory (PFAS legacy from research facilities), the Long Island Grumman-Bethpage PFAS plume, and the east Long Island military-adjacent PFAS background contribute to Mastic's elevated readings.
Geology & Source: Mastic in Suffolk County draws from the Suffolk County Water Authority on the Long Island Aquifer (Suffolk County, east-central Long Island) — the Long Island Aquifer at east-central Suffolk is developed in Pleistocene Ronkonkoma Aquifer sand and Cretaceous Magothy Formation (calcareous) — New York Suffolk County Long Island Aquifer calcareous system produces hard water at 169.5 mg/L with TDS 439.7 mg/L in this Suffolk County New York community.