Mount Kisco Water Hardness & Quality Report (2026)
Water Hardness
7.1 grains per gallon
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
257.3 mg/L
Est. Daily Cost
$0.33
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 Mount Kisco, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In Mount Kisco | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.6 yrs | 8.5 yrs | -34% |
| Washing Machine | 9.1 yrs | 12 yrs | -24% |
| Water Heater | 10.7 yrs | 15 yrs | -29% |
Regional Water Comparison
How Mount Kisco compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mount Kisco, New York | 122 mg/L | 5.9 ppt | 🟠 Hard | reservoir |
| North Castle, New York | 137 mg/L | 6.6 ppt | 🟠 Hard | reservoir |
| Jefferson Valley-Yorktown, New York | 109 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
| Ossining, New York | 109.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
| Cortlandt Manor, New York | 160.5 mg/L | 7.7 ppt | 🟠 Hard | reservoir |
National Benchmark
How Mount Kisco compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mount Kisco | 122 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mount Kisco's Water Unique?
Local geology and source profile
Mount Kisco, New York, in Westchester County — a Westchester County town adjacent to Bedford and Chappaqua in the northern Westchester suburbs — receives its water from United Water New York or Westchester County water, drawing from Kensico Reservoir through the southeast New York distribution.
The moderately hard 122 mg/L hardness and TDS of 257.3 mg/L reflect the Westchester County supply's moderate character — the Precambrian Hudson Highlands Gneiss provides insoluble dilution while Cambrian Wappinger Limestone and Ordovician Beekmantown Group contribute calcareous mineral content from the Hudson Valley limestone belt (compare Bedford NY: 119/250 in Westchester County comparable; Chappaqua NY: 124/264 in Westchester County comparable; Mount Kisco consistent moderate from the same Westchester County Kensico Reservoir Precambrian-Cambrian calcareous supply). The Croton watershed — Precambrian Hudson Highlands Gneiss (insoluble — primary dilutant), Cambrian Wappinger Limestone (calcareous — primary hardness contributor), and Quaternary Croton River alluvium (slightly calcareous — minor TDS).
At 122 mg/L with TDS 257, Mount Kisco's water is moderately hard — scale builds in appliances. Semi-annual descaling is appropriate. The PFAS level of 5.9 ppt warrants a certified drinking water filter. Review Westchester County water utility's annual water quality report.
Geology & Source: Mount Kisco in Westchester County draws from the Westchester Water on Kensico Reservoir (Westchester County, southeast New York) — the Croton watershed drains Precambrian Hudson Highlands Gneiss (insoluble) and Cambrian Wappinger Limestone (calcareous) — New York Westchester County Kensico Reservoir Precambrian-Cambrian calcareous supply produces moderately hard water at 122 mg/L with TDS 257.3 mg/L.