Sleepy Hollow Water Hardness & Quality Report (2026)
Water Hardness
7.9 grains per gallon
Source
reservoir
pH Level
7.9
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
305 mg/L
Est. Daily Cost
$0.36
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 Sleepy Hollow, your appliances are currently losing 18% efficiency due to mineral buildup.
| Appliance | In Sleepy Hollow | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.1 yrs | 8.5 yrs | -40% |
| Washing Machine | 8.6 yrs | 12 yrs | -28% |
| Water Heater | 10.2 yrs | 15 yrs | -32% |
Regional Water Comparison
How Sleepy Hollow compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Sleepy Hollow, New York | 135.5 mg/L | 6.5 ppt | 🟠 Hard | reservoir |
| Tarrytown, New York | 117 mg/L | 5.7 ppt | 🟡 Moderately Hard | reservoir |
| Greenburgh, New York | 92.5 mg/L | 4.5 ppt | 🟡 Moderately Hard | reservoir |
| Dobbs Ferry, New York | 134.5 mg/L | 6.5 ppt | 🟠 Hard | reservoir |
| Ossining, New York | 109.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Sleepy Hollow compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Sleepy Hollow | 135.5 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Sleepy Hollow's Water Unique?
Local geology and source profile
Sleepy Hollow, New York, in Westchester County — a Westchester County village adjacent to Tarrytown and Ossining on the Hudson River in the lower Hudson Valley — receives its water from United Water NY, drawing from the Catskill/Delaware watershed through the lower Hudson Valley distribution.
The hard 135.5 mg/L hardness and TDS of 305 mg/L reflect the Westchester County supply's hard blended character — while the Catskill watershed provides soft mountain water, the lower Hudson Valley Westchester distribution incorporates Ordovician Hudson Valley Shale-sourced groundwater, which concentrates harder mineral content in the riverside communities (compare Tarrytown NY: 132/296 in Westchester County comparable; Ossining NY: 138/314 in Westchester County comparable; Sleepy Hollow consistent hard from the same Westchester County Catskill watershed Devonian supply). The Lower Hudson Valley supply — Devonian Catskill Formation (insoluble — primary dilutant), Ordovician Hudson Valley Shale (slightly calcareous — primary hardness contributor), and Quaternary Hudson River alluvium (calcareous — TDS contributor).
At 135.5 mg/L with TDS 305, Sleepy Hollow's water is hard — scale builds in appliances. Quarterly descaling is appropriate. The PFAS level of 6.5 ppt warrants a certified drinking water filter. Review United Water NY's annual water quality report.
Geology & Source: Sleepy Hollow in Westchester County draws from the United Water on the Catskill/Delaware watershed (Westchester County, lower Hudson Valley) — the lower Hudson Valley supply draws from Devonian Catskill Formation (insoluble) and Ordovician Hudson Valley Shale (slightly calcareous) — New York Westchester County Catskill watershed Devonian supply produces hard water at 135.5 mg/L with TDS 305 mg/L.