Lynnwood Water Hardness & Quality Report (2026)
Water Hardness
4.1 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
175.2 mg/L
Est. Daily Cost
$0.19
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 Lynnwood, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Lynnwood | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Lynnwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lynnwood, Washington | 70 mg/L | 3.1 ppt | 🟡 Moderately Hard | reservoir |
| Mountlake Terrace, Washington | 58.5 mg/L | 2.7 ppt | 🟢 Soft | reservoir |
| Picnic Point-North Lynnwood, Washington | 60 mg/L | 2.7 ppt | 🟡 Moderately Hard | reservoir |
| Edmonds, Washington | 46.5 mg/L | 2.3 ppt | 🟢 Soft | reservoir |
| Shoreline, Washington | 15 mg/L | 1.3 ppt | 🟢 Soft | reservoir |
National Benchmark
How Lynnwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lynnwood | 70 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lynnwood's Water Unique?
Local geology and source profile
Lynnwood, Washington, in Snohomish County — a major south Snohomish County community directly north of Seattle's city boundary (Lynnwood is the major commercial center of south Snohomish County — Alderwood Mall is one of the premier shopping destinations in the greater Seattle area), a rapidly growing city expanding with light rail (the Sound Transit Lynnwood Link extension opened in 2024 — bringing light rail directly to Lynnwood for the first time and accelerating dense transit-oriented development), a diverse Snohomish County community with a significant Vietnamese-American, Korean-American, and Indian-American population, and a major commercial hub in the Seattle–Everett I-5 corridor — draws its municipal water supply via the Alderwood Water and Wastewater District or Seattle Public Utilities (for some zones). Water hardness in Lynnwood measures 70 mg/L — classified as moderately soft.
Lynnwood's moderate softness reflects the south Snohomish County Cascade Mountain watershed's calcareous-poor geology. The Tolt River and Cedar River watersheds draining the Western Cascades (Quaternary calcareous-poor Cascade basalt and andesite — calcareous-poor volcanic rock) produce exceptionally soft source water. The south Snohomish County distribution zone delivers the soft Cascade supply with minimal hardness addition, producing the moderate 70 mg/L.
With hardness at 70 mg/L, Lynnwood residents enjoy moderately soft water. Alderwood Water and Wastewater District consistently delivers water meeting all Washington State DOE and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the South Fork Tolt River and Chester Morse Lake (Cedar River watershed) via the Alderwood Water and Wastewater District or Seattle Public Utilities — the Snohomish County south suburban Seattle corridor (Quaternary calcareous-poor Cascades volcanic glacial outwash and Pleistocene calcareous-poor Fraser Glaciation till; south Snohomish County supply zone); moderately soft supply at 70 mg/L in Snohomish County.