Mukilteo Water Hardness & Quality Report (2026)
Water Hardness
3.6 grains per gallon
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
144.7 mg/L
Est. Daily Cost
$0.16
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 Mukilteo, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Mukilteo | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.6 yrs | 8.5 yrs | -11% |
| Washing Machine | 11.3 yrs | 12 yrs | -6% |
| Water Heater | 13.1 yrs | 15 yrs | -13% |
Regional Water Comparison
How Mukilteo compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mukilteo, Washington | 61.5 mg/L | 2.8 ppt | 🟡 Moderately Hard | reservoir |
| Picnic Point-North Lynnwood, Washington | 60 mg/L | 2.7 ppt | 🟡 Moderately Hard | reservoir |
| Everett, Washington | 60 mg/L | 2.8 ppt | 🟡 Moderately Hard | reservoir |
| Martha Lake, Washington | 13.5 mg/L | 1.3 ppt | 🟢 Soft | reservoir |
| Lynnwood, Washington | 70 mg/L | 3.1 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Mukilteo compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mukilteo | 61.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mukilteo's Water Unique?
Local geology and source profile
Mukilteo, Washington, in Snohomish County — a Snohomish County city on Puget Sound between Everett and Edmonds, home of the Mukilteo Ferry terminal (the Mukilteo-Clinton ferry crossing to Whidbey Island) and the Boeing Everett delivery center adjacent — a scenic Puget Sound waterfront community — receives its municipal water from the Mukilteo Water District or through City of Everett Water supply, which draws from Spada Lake Reservoir (the Sultan River reservoir in the North Cascades) through the Everett-Mukilteo regional treated water system.
The moderately soft 61.5 mg/L hardness and TDS of 144.7 mg/L reflect the Sultan River-Spada Lake watershed's North Cascade crystalline geological character. Spada Lake (Lake Chaplain Reservoir) on the Sultan River drains the North Cascade Range in eastern Snohomish County — terrain underlain by the Skagit Gneiss Complex (high-grade Precambrian-Paleozoic metamorphic rocks), Jurassic-Cretaceous metavolcanic and metasedimentary belts, and the Chelan Mountains crystalline core. These crystalline North Cascade rocks have minimal carbonate content, producing characteristically soft Pacific Northwest mountain water. The moderate hardness (61.5 mg/L) is typical for Everett-system water, slightly harder than the purest Cascade soft-rock supplies.
At 61.5 mg/L, Mukilteo's water is moderately soft — comfortable for household use. Scale forms slowly over many months, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 2.8 ppt is very good — reflecting Mukilteo's predominantly residential character and the Sultan River-Spada Lake watershed's limited direct military-industrial PFAS sources, despite the Boeing manufacturing presence and the greater Puget Sound military-aerospace complex.
Geology & Source: Mukilteo in Snohomish County draws from the Mukilteo Water District or Everett Water treating the Sultan River (via Spada Lake Reservoir) or the South Fork Stillaguamish system — the Sultan River drains the North Cascade Range (Precambrian-Paleozoic schist and Jurassic metavolcanic terrain) — North Cascade crystalline watershed drainage produces moderately soft water at 61.5 mg/L with TDS 145 mg/L in this Snohomish County city.