West Islip Water Hardness & Quality Report (2026)
Water Hardness
8.8 grains per gallon
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
363.4 mg/L
Est. Daily Cost
$0.40
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 West Islip, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In West Islip | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.6 yrs | 8.5 yrs | -46% |
| Washing Machine | 8 yrs | 12 yrs | -33% |
| Water Heater | 9.6 yrs | 15 yrs | -36% |
Regional Water Comparison
How West Islip compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ West Islip, New York | 151 mg/L | 7.2 ppt | 🟠 Hard | reservoir |
| North Babylon, New York | 173.5 mg/L | 8.3 ppt | 🟠 Hard | reservoir |
| West Babylon, New York | 140.5 mg/L | 6.7 ppt | 🟠 Hard | reservoir |
| Deer Park, New York | 117.5 mg/L | 5.7 ppt | 🟡 Moderately Hard | reservoir |
| Bay Shore, New York | 170.5 mg/L | 8.1 ppt | 🟠 Hard | reservoir |
National Benchmark
How West Islip compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ West Islip | 151 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes West Islip's Water Unique?
Local geology and source profile
West Islip, New York, in Suffolk County — a major west Suffolk County suburban community (West Islip is a significant Suffolk County hamlet — a Great South Bay shoreline community on the south shore of Long Island adjacent to Bay Shore and Babylon; West Islip is one of the classic post-WWII south shore Long Island communities with significant waterfront access to the Great South Bay (one of the most important estuarine bays in New York — the Great South Bay separates the Long Island mainland from Fire Island, one of the most iconic barrier islands and National Seashores in the East Coast)), home of Good Samaritan Hospital Medical Center (one of the most significant hospitals in the south shore Long Island region), a diverse Suffolk County community with a primarily Italian-American, Irish-American, and working-class to middle-class suburban family population, adjacent to Babylon in the west Suffolk County corridor, and a community shaped by its Great South Bay waterfront orientation — draws its municipal water supply via the Suffolk County Water Authority. Water hardness in West Islip measures 151 mg/L — classified as moderately hard.
West Islip's moderate hardness reflects the west Suffolk County Long Island groundwater aquifer's calcareous-moderate character. The Suffolk County Water Authority distributes groundwater from the Cretaceous Magothy Aquifer (calcareous-moderate) to the south shore West Islip zone with limited softening, producing the moderate 151 mg/L.
At 151 mg/L, West Islip residents encounter moderate scale accumulation. Monthly cleaning is recommended. Suffolk County Water Authority consistently delivers water meeting all New York State DEC and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Lloyd Aquifer (Nassau–Suffolk County groundwater) via the Suffolk County Water Authority (SCWA) — the Suffolk County south Long Island West Islip corridor (Cretaceous calcareous-moderate Magothy Aquifer sand and Pleistocene calcareous-moderate glacial moraine — the calcareous-moderate south Suffolk County coastal plain aquifer; limited softening); moderately hard supply at 151 mg/L in Suffolk County.