Greenwood Water Hardness & Quality Report (2026)
Water Hardness
3.2 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
120 mg/L
Est. Daily Cost
$0.14
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 Greenwood, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Greenwood | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.8 yrs | 8.5 yrs | -8% |
| Washing Machine | 11.6 yrs | 12 yrs | -3% |
| Water Heater | 13.4 yrs | 15 yrs | -11% |
Regional Water Comparison
How Greenwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Greenwood, Washington | 54 mg/L | 2.6 ppt | 🟢 Soft | reservoir |
| Shoreline, Washington | 15 mg/L | 1.3 ppt | 🟢 Soft | reservoir |
| Seattle, Washington | 18 mg/L | 1.2 ppt | 🟢 Soft | reservoir |
| Lake Forest Park, Washington | 21.5 mg/L | 1.5 ppt | 🟢 Soft | reservoir |
| Mountlake Terrace, Washington | 58.5 mg/L | 2.7 ppt | 🟢 Soft | reservoir |
National Benchmark
How Greenwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Greenwood | 54 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Greenwood's Water Unique?
Local geology and source profile
Greenwood, Washington, in King County — a King County neighborhood of Seattle adjacent to Crown Hill and Broadview in the Seattle metro — receives its water from the Seattle Public Utilities, drawing from Chester Morse Lake or the Tolt River (King County) through the Seattle metro distribution.
The soft 54 mg/L hardness and low TDS of 120 mg/L reflect the Seattle metro King County SPU supply's soft character — the Pleistocene Snoqualmie Granite and Tertiary North Cascades volcanics contribute insoluble dilution with minimal calcareous contact, consistent with the soft Cascade Mountain watershed supply (compare Lakeland North WA: 50.5/104 in Pierce County on the same Cascades supply comparable; Greenwood similar very soft range from the King County Cedar-Tolt supply). The Cedar-Tolt watershed at King County — Pleistocene Snoqualmie Granite (insoluble — primary dilutant), Tertiary North Cascades volcanics (insoluble — secondary dilutant), and Quaternary glacial till (slightly calcareous — minor hardness contributor).
At 54 mg/L, Greenwood's water is soft — scale forms very slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 2.6 ppt is low — a certified drinking water filter is advisable — the King County Seattle metro industrial corridor contribute to Greenwood's readings.
Geology & Source: Greenwood in King County draws from the Seattle Public Utilities on the Chester Morse Lake or Tolt River (King County, Seattle metro, Washington) — the Cedar-Tolt watershed at King County drains Pleistocene Snoqualmie Granite (insoluble) and Tertiary North Cascades volcanics (insoluble) — Washington King County Seattle SPU Cedar-Tolt Pleistocene insoluble supply produces soft water at 54 mg/L with TDS 120 mg/L.