Monroe Water Hardness & Quality Report (2026)
Water Hardness
2.8 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
101.3 mg/L
Est. Daily Cost
$0.13
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 Monroe, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Monroe | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8 yrs | 8.5 yrs | -6% |
| Washing Machine | 11.8 yrs | 12 yrs | -2% |
| Water Heater | 13.7 yrs | 15 yrs | -9% |
Regional Water Comparison
How Monroe compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Monroe, Washington | 48 mg/L | 2.4 ppt | 🟢 Soft | reservoir |
| Cottage Lake, Washington | 50 mg/L | 2.4 ppt | 🟢 Soft | reservoir |
| Silver Firs, Washington | 35.5 mg/L | 2 ppt | 🟢 Soft | reservoir |
| Lake Stevens, Washington | 24 mg/L | 1.6 ppt | 🟢 Soft | reservoir |
| Union Hill-Novelty Hill, Washington | 68.5 mg/L | 3 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Monroe compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Monroe | 48 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Monroe's Water Unique?
Local geology and source profile
Monroe, Washington, in Snohomish County — a Snohomish County city adjacent to Sultan and Snohomish on the Skykomish River in the North Cascades foothills east of Everett — receives its municipal water from the City of Monroe Water Division, drawing from the Skykomish River (Snohomish County) through the Monroe municipal intake.
The very soft 48 mg/L hardness and low TDS of 101.3 mg/L reflect the Skykomish River's North Cascades crystalline watershed character — very similar to Anacortes WA (46 mg/L, Skagit County). The Skykomish River drains the Index Batholith (Cretaceous granite — highly insoluble), the Marblemount Metamorphic Suite (crystalline — insoluble), and Quaternary Cascade volcanic glacial deposits (basalt-andesite — insoluble). The entirely non-calcareous North Cascades granitic-volcanic drainage produces the very soft water.
At 48 mg/L, Monroe's water is very soft — essentially no scale forms, soap lathers abundantly, and appliances maintain good efficiency. Annual descaling is sufficient. The PFAS level of 2.4 ppt is among the lowest for Washington State communities — reflecting the North Cascades' remote crystalline watershed and limited PFAS industrial footprint. A certified filter can be used for additional peace of mind.
Geology & Source: Monroe in Snohomish County draws from the Monroe Water Division on the Skykomish River (Snohomish County, North Cascades foothills) — the Skykomish drains the North Cascades (Cretaceous Index Batholith granite, Miocene Stevens Pass andesite) — Washington North Cascades Cretaceous granitic crystalline watershed produces very soft water at 48 mg/L with TDS 101.3 mg/L in this Snohomish County Washington city.