Oceanside Water Hardness & Quality Report (2026)
Water Hardness
5.3 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
159.6 mg/L
Est. Daily Cost
$0.24
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 Oceanside, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Oceanside | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.6 yrs | 8.5 yrs | -22% |
| Washing Machine | 10.3 yrs | 12 yrs | -14% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Oceanside compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Oceanside, New York | 90 mg/L | 4.4 ppt | 🟡 Moderately Hard | reservoir |
| Rockville Centre, New York | 65 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
| Lynbrook, New York | 138 mg/L | 6.6 ppt | 🟠 Hard | reservoir |
| Baldwin, New York | 151.5 mg/L | 7.3 ppt | 🟠 Hard | reservoir |
| Long Beach, New York | 118.5 mg/L | 5.7 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Oceanside compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Oceanside | 90 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Oceanside's Water Unique?
Local geology and source profile
Oceanside, New York, in Nassau County — a major south Nassau County Long Island coastal community (Oceanside is a significant south Nassau County unincorporated community — one of the most populous south shore Long Island communities, situated between Long Island Sound and the Atlantic Ocean barrier beach corridor; Oceanside is part of the densely settled south Nassau County suburban belt between Long Beach and Valley Stream), a diverse Nassau County community with a significant Italian-American, Jewish-American, and working-class suburban population (Oceanside is one of the classic post-WWII south Nassau Long Island suburban communities that grew dramatically following Levittown suburban development), adjacent to Jones Beach State Park (one of the most visited state parks in the United States — the Robert Moses–designed ocean beach park on the south Nassau barrier beach), and a community with strong coastal and commuter character — draws its municipal water supply from the South Nassau County aquifer via the South Nassau County Water Authority. Water hardness in Oceanside measures 90 mg/L — classified as moderately soft.
Oceanside's moderate softness reflects the south Nassau County Magothy Aquifer characteristics. The Magothy and Lloyd Aquifer at Oceanside–Nassau County draws from Pleistocene calcareous-moderate glacial outwash and Cretaceous Magothy Formation (calcareous-moderate coastal plain sediments). Treatment produces the moderately soft 90 mg/L.
With hardness at 90 mg/L, Oceanside residents enjoy moderately soft water. South Nassau County Water Authority consistently delivers water meeting all New York State DEC and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the South Shore Nassau County aquifer (Magothy and Lloyd aquifer) via the South Nassau County Water Authority — the Nassau County south Long Island Oceanside barrier island corridor (Pleistocene calcareous-moderate Magothy Aquifer and glacial outwash — the calcareous-moderate south Nassau County Long Island glacial aquifer; South Nassau coastal aquifer with treatment); moderately soft supply at 90 mg/L in Nassau County.