Smithtown Water Hardness & Quality Report (2026)
Water Hardness
8.4 grains per gallon
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
335.4 mg/L
Est. Daily Cost
$0.38
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 Smithtown, your appliances are currently losing 19% efficiency due to mineral buildup.
| Appliance | In Smithtown | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.8 yrs | 8.5 yrs | -44% |
| Washing Machine | 8.3 yrs | 12 yrs | -31% |
| Water Heater | 9.8 yrs | 15 yrs | -35% |
Regional Water Comparison
How Smithtown compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Smithtown, New York | 144 mg/L | 6.9 ppt | 🟠 Hard | reservoir |
| Hauppauge, New York | 132.5 mg/L | 6.4 ppt | 🟠 Hard | reservoir |
| Nesconset, New York | 153.5 mg/L | 7.3 ppt | 🟠 Hard | reservoir |
| Saint James, New York | 109.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
| Kings Park, New York | 161.5 mg/L | 7.7 ppt | 🟠 Hard | reservoir |
National Benchmark
How Smithtown compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Smithtown | 144 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Smithtown's Water Unique?
Local geology and source profile
Smithtown, New York, in Suffolk County — a major north Long Island suburban community (Smithtown is a significant Suffolk County township and hamlet — a north Long Island community adjacent to Nesconset and Kings Park; Smithtown is part of the greater Smithtown township (one of the most populous towns in Suffolk County); Smithtown is known for the Smithtown Bull statue (a large bronze bull sculpture at the entrance to Smithtown's downtown — commemorating the legend of Richard 'Bull' Smith, the founder of Smithtown, who is said to have claimed as much land as he could ride around on a bull in a single day; the legend is one of the more colorful founding myths of any American community)); Smithtown is a classic north shore Long Island post-WWII suburb with strong community institutions and a significant Italian-American and working-class to middle-class heritage population; the north shore Long Island Smithtown corridor along the Long Island Sound has excellent recreational and natural amenities (Sunken Meadow State Park — one of the most popular state parks in New York — is in the Smithtown Town area on the Long Island Sound), a diverse Suffolk County community — draws its municipal water supply via the Suffolk County Water Authority. Water hardness in Smithtown measures 144 mg/L — classified as moderately hard.
Smithtown's moderate hardness reflects the north Suffolk County Long Island Magothy aquifer's calcareous-moderate character. The Magothy Aquifer at Smithtown draws from Cretaceous calcareous-moderate Magothy Sand with limited softening, producing the moderately hard 144 mg/L.
At 144 mg/L, Smithtown 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 Upper Glacial and Magothy Aquifers via the Suffolk County Water Authority — the Suffolk County north Long Island Smithtown corridor (Cretaceous calcareous-moderate Magothy Sand — the calcareous-moderate north Suffolk County Long Island coastal plain aquifer; limited softening); moderately hard supply at 144 mg/L in Suffolk County.