Spuyten Duyvil Water Hardness & Quality Report (2026)
Water Hardness
3.7 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
96.6 mg/L
Est. Daily Cost
$0.17
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 Spuyten Duyvil, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Spuyten Duyvil | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.5 yrs | 8.5 yrs | -12% |
| Washing Machine | 11.2 yrs | 12 yrs | -7% |
| Water Heater | 13 yrs | 15 yrs | -13% |
Regional Water Comparison
How Spuyten Duyvil compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Spuyten Duyvil, New York | 64 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
| Kings Bridge, New York | 160.5 mg/L | 7.7 ppt | 🟠 Hard | reservoir |
| Inwood, New York | 108.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | reservoir |
| University Heights, New York | 65.5 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
| Fordham, New York | 127.5 mg/L | 6.2 ppt | 🟠 Hard | reservoir |
National Benchmark
How Spuyten Duyvil compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Spuyten Duyvil | 64 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Spuyten Duyvil's Water Unique?
Local geology and source profile
Spuyten Duyvil, New York, in Bronx County — a Bronx County neighborhood adjacent to Riverdale and Marble Hill at the northern tip of Manhattan Island and the Harlem Ship Canal — receives its water from the New York City DEP, drawing from the Catskill-Delaware watershed system through the New York City distribution.
The soft 64 mg/L hardness and low TDS of 96.6 mg/L reflect the Bronx County NYC DEP supply's soft character — the Devonian Catskill Formation and Silurian Shawangunk Conglomerate are largely insoluble clastic formations in the Catskill Mountains, and the Delaware and Catskill watershed reservoirs are among the largest and purest unfiltered water supplies in the world (compare Riverdale NY: 62/93 in Bronx County comparable; Marble Hill NY: 65/99 in Manhattan comparable; Spuyten Duyvil consistent soft from the same Bronx County Catskill-Delaware Devonian insoluble supply). The Catskill-Delaware watershed — Devonian Catskill Formation (insoluble — primary dilutant), Silurian Shawangunk Conglomerate (insoluble — secondary dilutant), and Quaternary Catskill alluvium (slightly calcareous — minimal TDS).
At 64 mg/L with TDS 97, Spuyten Duyvil's water is soft — minimal scale buildup. Annual descaling is appropriate. The PFAS level of 3.2 ppt is low — a clean result for NYC. Review NYC DEP's annual water quality report.
Geology & Source: Spuyten Duyvil in Bronx County draws from the NYC DEP on the Catskill-Delaware watershed (Bronx County, New York City, New York) — the Catskill-Delaware watershed drains Devonian Catskill Formation (insoluble) and Silurian Shawangunk Conglomerate (insoluble) — New York Bronx County Catskill-Delaware Devonian insoluble supply produces soft water at 64 mg/L with TDS 96.6 mg/L.