Jefferson Valley-Yorktown Water Hardness & Quality Report (2026)
Water Hardness
6.4 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
215.3 mg/L
Est. Daily Cost
$0.29
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 Jefferson Valley-Yorktown, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Jefferson Valley-Yorktown | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6 yrs | 8.5 yrs | -29% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 11.2 yrs | 15 yrs | -25% |
Regional Water Comparison
How Jefferson Valley-Yorktown compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Jefferson Valley-Yorktown, New York | 109 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
| Cortlandt Manor, New York | 160.5 mg/L | 7.7 ppt | 🟠 Hard | reservoir |
| Peekskill, New York | 144.5 mg/L | 7 ppt | 🟠 Hard | reservoir |
| Ossining, New York | 109.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
| North Castle, New York | 137 mg/L | 6.6 ppt | 🟠 Hard | reservoir |
National Benchmark
How Jefferson Valley-Yorktown compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Jefferson Valley-Yorktown | 109 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Jefferson Valley-Yorktown home
Shop water softeners on Amazon.com →
What Makes Jefferson Valley-Yorktown's Water Unique?
Local geology and source profile
Jefferson Valley-Yorktown, New York, in Westchester County — a Westchester County community adjacent to Somers and Yorktown Heights in north-central Westchester County — receives its water from the New York City DEP Catskill-Delaware system or local Westchester County reservoir, drawing from the New Croton and upper Westchester watershed (Westchester County) through the north Westchester distribution.
The moderately hard 109 mg/L hardness and TDS of 215.3 mg/L are slightly harder than the south Westchester communities (Wykagyl: 92.5 mg/L) — reflecting the north Westchester County position where the local reservoir is more influenced by the Cambrian Wappinger Limestone calcareous input at the Yorktown geological position near the Taconic calcareous formations. The North Westchester watershed — Precambrian Hartland Gneiss (insoluble), Cambrian Wappinger Limestone (calcareous — primary hardness contributor), Ordovician Martinsburg Shale (slightly calcareous — secondary contributor), and Pleistocene calcareous glacial till.
At 109 mg/L, Jefferson Valley-Yorktown's water is moderately 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 5.3 ppt warrants a certified drinking water filter — Stewart Air National Guard Base (Orange County — AFFF) and the north Westchester County industrial corridor contribute to Jefferson Valley-Yorktown's readings.
Geology & Source: Jefferson Valley-Yorktown in Westchester County draws from the New York City DEP or Westchester County reservoir (Westchester County, north Westchester County, New York) — the north Westchester watershed drains the Hudson Highlands gneiss (insoluble) with Cambrian Wappinger Limestone (calcareous — primary hardness contributor) — New York Westchester County Wappinger calcareous watershed produces moderately hard water at 109 mg/L with TDS 215.3 mg/L.