Oakwood Water Hardness & Quality Report (2026)
Water Hardness
5.1 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
154.8 mg/L
Est. Daily Cost
$0.23
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 Oakwood, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Oakwood | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.7 yrs | 8.5 yrs | -21% |
| Washing Machine | 10.3 yrs | 12 yrs | -14% |
| Water Heater | 12.1 yrs | 15 yrs | -19% |
Regional Water Comparison
How Oakwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Oakwood, New York | 88 mg/L | 4.3 ppt | 🟡 Moderately Hard | reservoir |
| Staten Island, New York | 36 mg/L | 3.6 ppt | 🟢 Soft | reservoir |
| Great Kills, New York | 86.5 mg/L | 4.2 ppt | 🟡 Moderately Hard | reservoir |
| Emerson Hill, New York | 83.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | reservoir |
| Eltingville, New York | 82.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Oakwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Oakwood | 88 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Oakwood's Water Unique?
Local geology and source profile
Oakwood, New York, in Richmond County — a Richmond County neighborhood adjacent to Great Kills and Eltingville in the south shore of Staten Island — receives its water from the New York City DEP, drawing from the Catskill/Delaware reservoir system through the Staten Island distribution.
The soft 88 mg/L hardness and TDS of 154.8 mg/L reflect the Richmond County NYC DEP supply's soft character — the Silurian Catskill Formation and Precambrian Hudson Highlands Gneiss are both highly insoluble formations contributing negligible dissolved minerals to the pristine Catskill-Delaware watershed (compare Great Kills NY: 86/149 in Richmond County comparable; Eltingville NY: 90/160 in Richmond County comparable; Oakwood consistent soft from the same Richmond County Catskill reservoir NYC DEP insoluble supply). The Catskill-Delaware watershed — Silurian Catskill Formation (insoluble — primary dilutant), Precambrian Hudson Highlands Gneiss (insoluble — secondary dilutant), and Quaternary Hudson Valley alluvium (slightly calcareous — minimal TDS).
At 88 mg/L with TDS 155, Oakwood's water is soft — minimal scale buildup. Annual descaling is appropriate. The PFAS level of 4.3 ppt is moderate — a certified drinking water filter provides added protection. Review the NYC DEP Water Quality Report annually.
Geology & Source: Oakwood in Richmond County draws from the New York City DEP on Catskill reservoir system (Richmond County, Staten Island) — the Catskill watershed drains Silurian Catskill Formation (insoluble) and Precambrian Hudson Highlands Gneiss (insoluble) — New York Richmond County Catskill reservoir NYC DEP insoluble supply produces soft water at 88 mg/L with TDS 154.8 mg/L.