Lake Morton-Berrydale Water Hardness & Quality Report (2026)
Water Hardness
2.7 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
96.9 mg/L
Est. Daily Cost
$0.12
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 Lake Morton-Berrydale, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Lake Morton-Berrydale | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.1 yrs | 8.5 yrs | -5% |
| Washing Machine | 11.9 yrs | 12 yrs | -1% |
| Water Heater | 13.7 yrs | 15 yrs | -9% |
Regional Water Comparison
How Lake Morton-Berrydale compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Lake Morton-Berrydale, Washington | 46.5 mg/L | 2.3 ppt | 🟢 Soft | reservoir |
| Covington, Washington | 55 mg/L | 2.6 ppt | 🟢 Soft | reservoir |
| Lea Hill, Washington | 25.5 mg/L | 1.7 ppt | 🟢 Soft | reservoir |
| Maple Valley, Washington | 78 mg/L | 3.3 ppt | 🟡 Moderately Hard | reservoir |
| East Hill-Meridian, Washington | 50.5 mg/L | 2.4 ppt | 🟢 Soft | reservoir |
National Benchmark
How Lake Morton-Berrydale compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Lake Morton-Berrydale | 46.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Lake Morton-Berrydale's Water Unique?
Local geology and source profile
Lake Morton-Berrydale, Washington, in King County — a King County unincorporated community adjacent to Auburn and Black Diamond in the south King County foothills — receives its water from the Covington Water District, drawing from the Green River watershed through the south King County distribution.
The very soft 46.5 mg/L hardness and low TDS of 96.9 mg/L reflect the King County supply's very soft Cascade foothills character — the Eocene Puget Group sandstone and Quaternary Green River Valley glaciofluvial deposits are insoluble-sandy insoluble formations in the south Cascades; the Green River watershed draws from clean Cascade upland volcanic and sandstone formations with minimal dissolved mineral content (compare Auburn WA: 43/91 in King County comparable; Black Diamond WA: 49/103 in King County comparable; Lake Morton-Berrydale consistent very soft from the same King County Green River Eocene insoluble supply). The Green River watershed — Eocene Puget Group sandstone (insoluble — primary dilutant), Quaternary Green River Valley glaciofluvial deposit (sandy insoluble — secondary dilutant), and Quaternary south Cascade volcanic deposit (insoluble — minimal TDS).
At 46.5 mg/L with TDS 97, Lake Morton-Berrydale's water is very soft — virtually no scale, but soft water can be corrosive to older metal plumbing. Annual corrosion checks are recommended. The PFAS level of 2.3 ppt is very low — an excellent and clean result for south King County. Review the Covington Water District's annual water quality report.
Geology & Source: Lake Morton-Berrydale in King County draws from the Covington Water on the Tacoma/Green River watershed (King County, south King County) — the south Cascades at King County draws from Eocene Puget Group sandstone (insoluble) and Quaternary Green River Valley glaciofluvial (sandy insoluble) — Washington King County Green River Eocene insoluble supply produces very soft water at 46.5 mg/L with TDS 96.9 mg/L.