Woodinville Water Hardness & Quality Report (2026)
Water Hardness
2.4 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
83 mg/L
Est. Daily Cost
$0.11
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 Woodinville, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Woodinville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.2 yrs | 8.5 yrs | -4% |
| Washing Machine | 12.1 yrs | 12 yrs | — |
| Water Heater | 13.9 yrs | 15 yrs | -7% |
Regional Water Comparison
How Woodinville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Woodinville, Washington | 41.5 mg/L | 2.2 ppt | 🟢 Soft | reservoir |
| Kingsgate, Washington | 79.5 mg/L | 3.4 ppt | 🟡 Moderately Hard | reservoir |
| Bothell, Washington | 35 mg/L | 2 ppt | 🟢 Soft | reservoir |
| North Creek, Washington | 79 mg/L | 3.3 ppt | 🟡 Moderately Hard | reservoir |
| Maltby, Washington | 75 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Woodinville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Woodinville | 41.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Woodinville's Water Unique?
Local geology and source profile
Woodinville, Washington, in King County — a King County city adjacent to Redmond and Bothell in the northeast Seattle suburbs along the Sammamish River corridor — receives its water from Seattle Public Utilities, drawing from the Tolt River reservoir and Cedar River watershed through the northwest Washington metropolitan distribution.
The very soft 41.5 mg/L hardness and low TDS of 83 mg/L reflect the King County Cascade supply's very soft character — the Quaternary Cascade volcanic deposits (primarily andesite and basalt) and Tertiary Snoqualmie Batholith (granodiorite) are both highly insoluble crystalline formations contributing negligible dissolved minerals to the pristine Cascade snowmelt runoff (compare Redmond WA: 40/80 in King County comparable; Bothell WA: 43/86 in King County comparable; Woodinville consistent very soft from the same King County Tolt River Cascade volcanic supply). The Tolt watershed — Quaternary Cascade volcanic deposits (insoluble — primary dilutant), Tertiary Snoqualmie Batholith (insoluble — secondary dilutant), and Holocene Cascade alluvium (insoluble — minimal TDS).
At 41.5 mg/L with TDS 83, Woodinville's water is very soft — virtually no scale buildup. The PFAS level of 2.2 ppt is very low — an excellent result. Woodinville has one of the cleanest water profiles in Washington State. Review Seattle Public Utilities' annual water quality report for the latest data.
Geology & Source: Woodinville in King County draws from Seattle Public Utilities on the Tolt River reservoir (King County, northwest Washington) — the Tolt watershed at King County drains Quaternary Cascade volcanic deposits (insoluble) and Tertiary Snoqualmie Batholith (insoluble) — Washington King County Tolt River Cascade volcanic supply produces very soft water at 41.5 mg/L with TDS 83 mg/L.