Valley Stream Water Hardness & Quality Report (2026)
Water Hardness
4.2 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
114.4 mg/L
Est. Daily Cost
$0.19
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 Valley Stream, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Valley Stream | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.2 yrs | 8.5 yrs | -15% |
| Washing Machine | 10.9 yrs | 12 yrs | -9% |
| Water Heater | 12.7 yrs | 15 yrs | -15% |
Regional Water Comparison
How Valley Stream compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Valley Stream, New York | 72 mg/L | 3.6 ppt | 🟡 Moderately Hard | reservoir |
| North Valley Stream, New York | 74 mg/L | 3.6 ppt | 🟡 Moderately Hard | reservoir |
| Rosedale, New York | 73.5 mg/L | 3.6 ppt | 🟡 Moderately Hard | reservoir |
| Woodmere, New York | 87.5 mg/L | 4.3 ppt | 🟡 Moderately Hard | reservoir |
| Elmont, New York | 81 mg/L | 4 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Valley Stream compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Valley Stream | 72 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Valley Stream's Water Unique?
Local geology and source profile
Valley Stream, New York, a village in the Town of Hempstead in Nassau County — a major southwest Nassau County Long Island community adjacent to the Queens–Nassau County border, home of Green Acres Mall (one of the largest malls in the New York metro area), a diverse Nassau County community with significant African-American, Haitian-American, and Indian-American populations, and a major Queens–Nassau border suburban community in the southwest Long Island corridor — draws its municipal water supply from the Upper Glacial and Magothy Aquifers via the Nassau County DPW. Water hardness in Valley Stream measures 72 mg/L — classified as moderately soft.
Valley Stream's moderate softness — notably softer than much of Nassau County (East Meadow: 172.5 mg/L) — reflects the southwest Nassau County aquifer zone's characteristics. The Valley Stream southern Nassau County zone draws from the Upper Glacial Aquifer (calcareous-poor Pleistocene glacial outwash) and the Magothy Formation (calcareous-poor quartz sand). The southern Nassau County aquifer system in the Valley Stream area has less calcareous character than the northern Nassau zones closer to the calcareous Cretaceous Lloyd Formation and Harbor Hill Moraine, producing the moderate 72 mg/L.
With hardness at 72 mg/L, Valley Stream residents enjoy moderately soft water. Nassau County DPW consistently delivers water meeting all New York State DEC and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Upper Glacial Aquifer and Magothy Aquifer via the Nassau County Department of Public Works — the Nassau County southwest Long Island (Pleistocene Upper Glacial deposits and Cretaceous Magothy Formation — Long Island's principal aquifer system; Valley Stream southern Nassau zone); moderately soft supply at 72 mg/L in Nassau County.