Klahanie Water Hardness & Quality Report (2026)
Water Hardness
2.1 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
69.8 mg/L
Est. Daily Cost
$0.10
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 Klahanie, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Klahanie | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.4 yrs | 8.5 yrs | -1% |
| Washing Machine | 12.2 yrs | 12 yrs | — |
| Water Heater | 14.1 yrs | 15 yrs | -6% |
Regional Water Comparison
How Klahanie compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Klahanie, Washington | 36.5 mg/L | 2 ppt | 🟢 Soft | reservoir |
| City of Sammamish, Washington | 59.5 mg/L | 2.7 ppt | 🟢 Soft | reservoir |
| Issaquah, Washington | 44 mg/L | 2.2 ppt | 🟢 Soft | reservoir |
| West Lake Sammamish, Washington | 17.5 mg/L | 1.4 ppt | 🟢 Soft | reservoir |
| Sammamish, Washington | 60 mg/L | 2.7 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Klahanie compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Klahanie | 36.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Klahanie's Water Unique?
Local geology and source profile
Klahanie, Washington, in King County — a King County unincorporated planned community adjacent to Issaquah and Sammamish in the east Seattle suburbs — receives its water from Seattle Public Utilities or Eastside Water District, drawing from the Cedar River watershed through the northwest Washington distribution.
The very soft 36.5 mg/L hardness and low TDS of 69.8 mg/L reflect the King County Cedar River supply's very soft volcanic character — the Oligocene Cascade volcanic tuff and Pleistocene Puget Glacial Drift are largely insoluble, and the Cedar River watershed's protected wilderness status minimizes mineral dissolution (compare Issaquah WA: 34/64 in King County comparable; Sammamish WA: 38/74 in King County comparable; Klahanie consistent very soft from the same King County Cedar River Oligocene insoluble supply). The Cedar River watershed — Oligocene Cascade volcanic tuff (insoluble — primary dilutant), Pleistocene Puget Glacial Drift (slightly calcareous — primary hardness contributor), and Quaternary Cedar River alluvium (slightly calcareous — minor TDS).
At 36.5 mg/L with TDS 70, Klahanie's water is very soft — virtually no scale buildup. Soft water can be mildly corrosive — monitor for copper staining. The PFAS level of 2.0 ppt is very low — an excellent result for the Seattle area. Review Seattle Public Utilities' annual water quality report.
Geology & Source: Klahanie in King County draws from the Seattle Public Utilities on the Cedar River watershed (King County, northwest Washington) — the Cedar River watershed draws from Oligocene Cascade volcanic tuff (insoluble) and Pleistocene Puget Glacial Drift (slightly calcareous) — Washington King County Cedar River Oligocene insoluble supply produces very soft water at 36.5 mg/L with TDS 69.8 mg/L.