Deer Park Water Hardness & Quality Report (2026)
Water Hardness
6.9 grains per gallon
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
241.7 mg/L
Est. Daily Cost
$0.31
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 Deer Park, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In Deer Park | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.7 yrs | 8.5 yrs | -33% |
| Washing Machine | 9.3 yrs | 12 yrs | -22% |
| Water Heater | 10.9 yrs | 15 yrs | -27% |
Regional Water Comparison
How Deer Park compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Deer Park, New York | 117.5 mg/L | 5.7 ppt | 🟡 Moderately Hard | reservoir |
| Dix Hills, New York | 134.5 mg/L | 6.4 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 |
| West Islip, New York | 151 mg/L | 7.2 ppt | 🟠 Hard | reservoir |
National Benchmark
How Deer Park compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Deer Park | 117.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Deer Park's Water Unique?
Local geology and source profile
Deer Park, New York, in Suffolk County — a major west Suffolk County suburban community (Deer Park is a significant Suffolk County hamlet — a west Suffolk County community in Babylon Town adjacent to Wyandanch and North Babylon; Deer Park is a classic post-WWII suburban Long Island community that developed rapidly in the 1950s and 1960s as part of the massive Long Island residential expansion; Deer Park has a significant Korean-American community (one of the more established Korean-American communities in the western Suffolk County area — Korean-American businesses, churches, and community organizations are present in Deer Park along Deer Park Avenue)), home of the Deer Park LIRR station (an important Long Island Rail Road stop on the Ronkonkoma branch — one of the most heavily used LIRR lines), a diverse Suffolk County community with a primarily working-class, Korean-American, Hispanic-American, and suburban family population, adjacent to North Babylon in the west Suffolk County corridor, and a growing west Suffolk suburban community — draws its municipal water supply via the Suffolk County Water Authority. Water hardness in Deer Park measures 117.5 mg/L — classified as moderately hard.
Deer Park's moderate hardness reflects the west Suffolk County Long Island aquifer's calcareous-moderate character. The Magothy Aquifer at Deer Park draws from Cretaceous calcareous-moderate Magothy Sand with limited softening, producing the moderate 117.5 mg/L.
At 117.5 mg/L, Deer Park 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 Magothy and Lloyd Aquifers via the Suffolk County Water Authority — the Suffolk County west Suffolk Deer Park corridor (Cretaceous calcareous-moderate Magothy Sand — the calcareous-moderate west Suffolk County Long Island coastal plain aquifer; limited softening); moderately hard supply at 117.5 mg/L in Suffolk County.