Uniondale Water Hardness & Quality Report (2026)
Water Hardness
3.7 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
96.3 mg/L
Est. Daily Cost
$0.17
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 Uniondale, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Uniondale | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.5 yrs | 8.5 yrs | -12% |
| Washing Machine | 11.2 yrs | 12 yrs | -7% |
| Water Heater | 13 yrs | 15 yrs | -13% |
Regional Water Comparison
How Uniondale compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Uniondale, New York | 64 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
| Roosevelt, New York | 70 mg/L | 3.5 ppt | 🟡 Moderately Hard | reservoir |
| Hempstead, New York | 143.5 mg/L | 6.9 ppt | 🟠 Hard | reservoir |
| East Meadow, New York | 172.5 mg/L | 8.2 ppt | 🟠 Hard | reservoir |
| Freeport, New York | 146 mg/L | 7 ppt | 🟠 Hard | reservoir |
National Benchmark
How Uniondale compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Uniondale | 64 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Uniondale home
Shop water softeners on Amazon.com →
What Makes Uniondale's Water Unique?
Local geology and source profile
Uniondale, New York, in Nassau County in central Long Island, receives its municipal water from the Nassau County Water District or local village water districts drawing from the Magothy Aquifer — Long Island's principal freshwater aquifer system. Long Island is geologically distinct from the mainland: it is essentially a glacial moraine built atop Cretaceous and Tertiary Coastal Plain sediments (the Magothy, Lloyd, and Raritan Formations), overlain by Pleistocene glacial deposits from two major ice advances. Nassau County's water supply is derived entirely from these subsurface sand and gravel aquifers — there are no significant surface water intakes on Long Island.
The moderately soft 64 mg/L hardness reflects the Magothy Aquifer's composition. The Magothy Formation consists primarily of Cretaceous quartz sands — siliceous, carbonate-free sediments deposited in a coastal plain environment during the late Cretaceous period. These pure quartz sands dissolve essentially no calcium or magnesium as groundwater percolates through them, yielding naturally soft, low-mineral water. Some hardness arises from thin calcareous layers within the glacial till overburden and modest mineral contact in the vadose zone, moderating the finished water to the soft-to-moderate range.
At 64 mg/L, Uniondale's water is moderately soft — a comfortable, appliance-friendly supply for a Nassau County community. Soap lathers well, appliances scale slowly over many months, and glassware from the dishwasher emerges clean with minimal spotting. Semi-annual descaling of kettles and coffee machines is adequate. The very low PFAS level of 3.2 ppt is favorable for Nassau County — Long Island's extensive groundwater protection regulations and aquifer management have helped limit PFAS infiltration in many central Long Island water districts. Overall, Uniondale's water quality profile is genuinely favorable for everyday household use.
Geology & Source: Uniondale in Nassau County draws from the Magothy Aquifer and Lloyd Aquifer — the primary Long Island groundwater aquifer system consisting of Cretaceous and Pleistocene unconsolidated siliceous sands and gravels with minimal carbonate content — quartz-dominated Atlantic Coastal Plain sandy aquifer with negligible limestone contact produces moderately soft water at 64 mg/L from the Nassau County groundwater basin.