Snoqualmie Water Hardness & Quality Report (2026)
Water Hardness
2 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
63.4 mg/L
Est. Daily Cost
$0.09
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 Snoqualmie, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Snoqualmie | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.3 yrs | 12 yrs | — |
| Water Heater | 14.2 yrs | 15 yrs | -5% |
Regional Water Comparison
How Snoqualmie compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Snoqualmie, Washington | 34 mg/L | 1.9 ppt | 🟢 Soft | reservoir |
| Issaquah, Washington | 44 mg/L | 2.2 ppt | 🟢 Soft | reservoir |
| City of Sammamish, Washington | 59.5 mg/L | 2.7 ppt | 🟢 Soft | reservoir |
| Union Hill-Novelty Hill, Washington | 68.5 mg/L | 3 ppt | 🟡 Moderately Hard | reservoir |
| Maple Valley, Washington | 78 mg/L | 3.3 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Snoqualmie compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Snoqualmie | 34 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Snoqualmie's Water Unique?
Local geology and source profile
Snoqualmie, Washington, in King County — a King County city adjacent to North Bend and Fall City on the Snoqualmie River in east King County — receives its water from the City of Snoqualmie Water, drawing from the Snoqualmie River or local Cascade Range reservoir (King County) through the east King County distribution.
The very soft 34 mg/L hardness and TDS of 63.4 mg/L reflect the east King County Snoqualmie River supply's very soft character — the Snoqualmie River drains the insoluble Cascade Range volcanic watershed, producing very soft water similar to the SPU Cedar-Tolt system communities (compare Lake Forest Park WA: 21.5 mg/L; Lea Hill WA: 25.5 mg/L) though slightly harder from the Snoqualmie River's contact with minor calcareous glacial till. The Snoqualmie watershed at King County — Oligocene Stevens Ridge Formation (insoluble — primary dilutant), Quaternary Cascade volcanic basalt (insoluble — secondary dilutant), and Pleistocene glacial till (slightly calcareous — trace hardness contributor).
At 34 mg/L, Snoqualmie's water is very soft — no meaningful scale buildup, appliances last their full service life, and no softening is needed. The PFAS level of 1.9 ppt is very low — no urgent filtration needed, routine monitoring is sufficient.
Geology & Source: Snoqualmie in King County draws from the City of Snoqualmie Water on the Snoqualmie River or local Cascade Range reservoir (King County, east King County, Washington) — the Snoqualmie watershed drains the Cascade Range (Oligocene Stevens Ridge Formation — insoluble) and Quaternary Cascade volcanic basalt (insoluble) — Washington King County Snoqualmie River Cascade insoluble volcanic supply produces very soft water at 34 mg/L with TDS 63.4 mg/L.