Tarrytown Water Hardness & Quality Report (2026)
Water Hardness
6.8 grains per gallon
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
240.9 mg/L
Est. Daily Cost
$0.31
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 Tarrytown, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In Tarrytown | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.7 yrs | 8.5 yrs | -33% |
| Washing Machine | 9.3 yrs | 12 yrs | -22% |
| Water Heater | 10.9 yrs | 15 yrs | -27% |
Regional Water Comparison
How Tarrytown compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Tarrytown, New York | 117 mg/L | 5.7 ppt | 🟡 Moderately Hard | reservoir |
| Sleepy Hollow, New York | 135.5 mg/L | 6.5 ppt | 🟠 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 Tarrytown compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Tarrytown | 117 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Tarrytown's Water Unique?
Local geology and source profile
Tarrytown, New York, in Westchester County — a Westchester County village adjacent to Sleepy Hollow and Elmsford on the Hudson River in south New York — receives its water from Suez Water New York or the Westchester Joint Water Works, drawing from the Catskill-Delaware Aqueduct system and local reservoirs through the south New York distribution.
The moderately hard 117 mg/L hardness and TDS of 240.9 mg/L reflect the Westchester County Catskill-Delaware supply's moderate character — the Precambrian Highlands Gneiss and Catskill Mountains insoluble bedrock produce relatively soft water that gains modest hardness from Ordovician and Cambrian limestone formations in the Hudson Valley (compare Sleepy Hollow NY: 114/234 in Westchester County comparable; Elmsford NY: 120/247 in Westchester County comparable; Tarrytown consistent moderate from the same Westchester County Catskill-Delaware Precambrian supply). The Hudson watershed — Precambrian Highlands Gneiss (insoluble — primary dilutant), Ordovician Walloomsac Formation (slightly calcareous — primary hardness contributor), and Quaternary Hudson alluvium (slightly calcareous — TDS contributor).
At 117 mg/L with TDS 241, Tarrytown's water is moderately hard — mild scale buildup in appliances. Semi-annual descaling is appropriate. The PFAS level of 5.7 ppt is elevated — a certified drinking water filter is recommended. Review Suez Water's annual water quality report for the latest monitoring data.
Geology & Source: Tarrytown in Westchester County draws from the Suez Water on Catskill-Delaware aqueduct (Westchester County, south New York) — the Hudson watershed drains Precambrian Highlands Gneiss (insoluble) and Ordovician Walloomsac Formation (slightly calcareous) — New York Westchester County Catskill-Delaware Precambrian supply produces moderately hard water at 117 mg/L with TDS 240.9 mg/L.