North Castle Water Hardness & Quality Report (2026)
Water Hardness
8 grains per gallon
Source
reservoir
pH Level
7.9
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
310 mg/L
Est. Daily Cost
$0.37
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 North Castle, your appliances are currently losing 18% efficiency due to mineral buildup.
| Appliance | In North Castle | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.1 yrs | 8.5 yrs | -40% |
| Washing Machine | 8.5 yrs | 12 yrs | -29% |
| Water Heater | 10.1 yrs | 15 yrs | -33% |
Regional Water Comparison
How North Castle compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ North Castle, New York | 137 mg/L | 6.6 ppt | 🟠 Hard | reservoir |
| Greenwich, Connecticut | 33.5 mg/L | 6.2 ppt | 🟢 Soft | reservoir |
| White Plains, New York | 172 mg/L | 8.2 ppt | 🟠 Hard | reservoir |
| Port Chester, New York | 82 mg/L | 4 ppt | 🟡 Moderately Hard | reservoir |
| North Stamford, Connecticut | 95 mg/L | 11.5 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How North Castle compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ North Castle | 137 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes North Castle's Water Unique?
Local geology and source profile
North Castle, New York, in Westchester County — a Westchester County town adjacent to Armonk and White Plains in south New York — receives its water from the Westchester Joint Water Works, drawing from the Kensico Reservoir or Rye Lake (Westchester County) through the south New York distribution.
The hard 137 mg/L hardness and TDS of 310 mg/L are harder than expected for the Catskill-Delaware NYC supply (typically 40-80 mg/L) — reflecting North Castle's Westchester County distribution position where local groundwater blending with the Cambrian Inwood Marble slightly calcareous and Quaternary Westchester drift adds significant hardness over the pure NYC Catskill supply (compare Wawarsing NY: 70.5/169 on the direct Catskill Aqueduct much softer; North Castle harder from the Westchester County blended distribution). The Catskill-Delaware system at Westchester County — Precambrian Fordham Gneiss (insoluble — dilutant from reservoir), Cambrian Inwood Marble (slightly calcareous — primary hardness contributor from blending), and Quaternary Westchester drift (calcareous — TDS contributor).
At 137 mg/L with TDS 310, North Castle's water is hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 6.6 ppt warrants a certified drinking water filter — the Westchester County south New York military and industrial corridor contribute to North Castle's elevated readings.
Geology & Source: North Castle in Westchester County draws from the Westchester Joint Water Works on the Kensico Reservoir or Rye Lake (Westchester County, south New York) — the Catskill-Delaware watershed at Westchester County drains Precambrian Fordham Gneiss (insoluble) and Cambrian Inwood Marble (slightly calcareous) — New York Westchester County Catskill-Delaware Precambrian insoluble supply produces hard water at 137 mg/L with TDS 310 mg/L.