Kings Park Water Hardness & Quality Report (2026)
Water Hardness
9.4 grains per gallon
Source
reservoir
pH Level
8.1
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
406.1 mg/L
Est. Daily Cost
$0.43
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 Kings Park, your appliances are currently losing 22% efficiency due to mineral buildup.
| Appliance | In Kings Park | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.3 yrs | 8.5 yrs | -49% |
| Washing Machine | 7.6 yrs | 12 yrs | -37% |
| Water Heater | 9.1 yrs | 15 yrs | -39% |
Regional Water Comparison
How Kings Park compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Kings Park, New York | 161.5 mg/L | 7.7 ppt | 🟠 Hard | reservoir |
| Commack, New York | 174 mg/L | 8.3 ppt | 🟠 Hard | reservoir |
| Smithtown, New York | 144 mg/L | 6.9 ppt | 🟠 Hard | reservoir |
| East Northport, New York | 174 mg/L | 8.3 ppt | 🟠 Hard | reservoir |
| Hauppauge, New York | 132.5 mg/L | 6.4 ppt | 🟠 Hard | reservoir |
National Benchmark
How Kings Park compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kings Park | 161.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Kings Park's Water Unique?
Local geology and source profile
Kings Park, New York, in Suffolk County — a Suffolk County community adjacent to Smithtown and Commack on the north shore of Long Island, the former site of the Kings Park Psychiatric Center — receives its municipal water from the Suffolk County Water Authority (SCWA), drawing from the Long Island Aquifer (Upper Glacial and Magothy Aquifers) through local well fields in north Suffolk County.
The hard 161.5 mg/L hardness and elevated TDS of 406.1 mg/L reflect the north Suffolk County Long Island Aquifer's calcareous character — harder than the south Nassau County supply (Woodmere: 87.5 mg/L) and consistent with the north Suffolk aquifer zone where deeper Cretaceous Magothy Formation production encounters higher mineral content. The Pleistocene glacial outwash and Cretaceous Magothy Formation (quartz sand aquifer) produce the moderately hard Long Island supply.
At 161.5 mg/L, Kings Park's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and water heaters should be descaled annually. Quarterly descaling is appropriate. The PFAS level of 7.7 ppt warrants a certified drinking water filter — the Kings Park Psychiatric Center groundwater contamination legacy, the Republic Airport AFFF plume (south Suffolk), and the Nassau-Suffolk Long Island PFAS complex contribute to Kings Park's elevated readings.
Geology & Source: Kings Park in Suffolk County draws from Suffolk County Water Authority on the Long Island Aquifer (north Suffolk County) — the aquifer is developed in Pleistocene glacial outwash and Cretaceous Magothy Formation (quartz sand) — New York Long Island Pleistocene-Cretaceous aquifer produces hard water at 161.5 mg/L with TDS 406.1 mg/L in this Suffolk County New York community.