Union Hill-Novelty Hill Water Hardness & Quality Report (2026)
Water Hardness
4 grains per gallon
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
169.3 mg/L
Est. Daily Cost
$0.18
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 Union Hill-Novelty Hill, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Union Hill-Novelty Hill | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11.1 yrs | 12 yrs | -8% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Union Hill-Novelty Hill compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Union Hill-Novelty Hill, Washington | 68.5 mg/L | 3 ppt | 🟡 Moderately Hard | reservoir |
| Sammamish, Washington | 60 mg/L | 2.7 ppt | 🟡 Moderately Hard | reservoir |
| City of Sammamish, Washington | 59.5 mg/L | 2.7 ppt | 🟢 Soft | reservoir |
| Cottage Lake, Washington | 50 mg/L | 2.4 ppt | 🟢 Soft | reservoir |
| Redmond, Washington | 24.5 mg/L | 1.6 ppt | 🟢 Soft | reservoir |
National Benchmark
How Union Hill-Novelty Hill compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Union Hill-Novelty Hill | 68.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Union Hill-Novelty Hill's Water Unique?
Local geology and source profile
Union Hill-Novelty Hill, Washington, in King County — an unincorporated King County community adjacent to Redmond and Duvall, in the northeast King County rural-suburban corridor east of Redmond and the Microsoft campus — receives its municipal water from King County Water District 90 or local water purveyors, drawing from the Snoqualmie River watershed or through the regional King County supply network.
The soft 68.5 mg/L hardness and TDS of 169.3 mg/L are somewhat harder than the typical Seattle Cedar River or Snoqualmie-fed supplies — likely reflecting the specific local well or surface water source in the northeast King County area, which may access somewhat more mineralized Pleistocene glacial deposits than the main Seattle Cedar River supply. The Snoqualmie watershed drains the Cascades (volcanic, insoluble), but the Novelty Hill area's glacial outwash deposits may contribute slight additional hardness.
At 68.5 mg/L, Union Hill-Novelty Hill's water is soft — essentially no scale forms, soap lathers abundantly, and appliances maintain good efficiency. Annual descaling is sufficient. The PFAS level of 3.0 ppt is very good — reflecting the protected Cascade watershed character and the limited direct PFAS industrial sources in the northeast King County rural corridor (away from the major Puget Sound military-industrial PFAS plumes).
Geology & Source: Union Hill-Novelty Hill in King County draws from the King County Water District 90 or Novelty Hill Water on the Snoqualmie River watershed (King County, Cascade Range) — the Snoqualmie drains the Cascade Range (Eocene Naches Formation sandstone, Tertiary Cascades volcanic) — Washington Cascades volcanic and sandstone watershed produces soft water at 68.5 mg/L with TDS 169 mg/L in this King County Washington community.