East Islip Water Hardness & Quality Report (2026)
Water Hardness
10 grains per gallon
Source
reservoir
pH Level
8.2
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
446.5 mg/L
Est. Daily Cost
$0.46
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 East Islip, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In East Islip | 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 East Islip compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ East Islip, New York | 171 mg/L | 8.2 ppt | 🟠 Hard | reservoir |
| Islip, New York | 115 mg/L | 5.5 ppt | 🟡 Moderately Hard | reservoir |
| Bay Shore, New York | 170.5 mg/L | 8.1 ppt | 🟠 Hard | reservoir |
| Central Islip, New York | 114.5 mg/L | 5.5 ppt | 🟡 Moderately Hard | reservoir |
| North Bay Shore, New York | 174 mg/L | 8.3 ppt | 🟠 Hard | reservoir |
National Benchmark
How East Islip compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ East Islip | 171 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes East Islip's Water Unique?
Local geology and source profile
East Islip, New York, in Suffolk County — a Suffolk County community adjacent to Islip and Bay Shore 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 south-central Long Island distribution.
The hard 171 mg/L hardness and TDS of 446.5 mg/L reflect the south-central Suffolk County Long Island Aquifer's hard character — consistent with other SCWA south shore communities (Mastic Beach: 169.5 mg/L; Bay Shore: ~170 mg/L). The Long Island Aquifer at Suffolk County is developed in Pleistocene glacial outwash (slightly calcareous), Cretaceous Magothy Aquifer (slightly calcareous — primary hardness contributor at the deeper Suffolk zone), and Cretaceous Lloyd Sand (insoluble). The deeper, more concentrated Suffolk County Long Island Aquifer produces the hard south shore supply.
At 171 mg/L, East Islip'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 8.2 ppt is elevated — MacArthur Airport (Islip, Suffolk County — AFFF), Brookhaven National Laboratory (Upton, Suffolk County — AFFF), and the central Suffolk County PFAS industrial corridor contribute to East Islip's elevated readings.
Geology & Source: East Islip in Suffolk County draws from the Suffolk County Water Authority on the Long Island Aquifer (Suffolk County, south-central 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 171 mg/L with TDS 446.5 mg/L.