White Center Water Hardness & Quality Report (2026)
Water Hardness
1.3 grains per gallon
Source
reservoir
pH Level
7.2
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
38.6 mg/L
Est. Daily Cost
$0.06
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 White Center, your appliances are currently losing 3% efficiency due to mineral buildup.
| Appliance | In White Center | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.8 yrs | 8.5 yrs | — |
| Washing Machine | 12.7 yrs | 12 yrs | — |
| Water Heater | 14.7 yrs | 15 yrs | -2% |
Regional Water Comparison
How White Center compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ White Center, Washington | 23 mg/L | 1.6 ppt | 🟢 Soft | reservoir |
| Burien, Washington | 53.5 mg/L | 2.5 ppt | 🟢 Soft | reservoir |
| Seattle, Washington | 18 mg/L | 1.2 ppt | 🟢 Soft | reservoir |
| Columbia City, Washington | 40 mg/L | 2.1 ppt | 🟢 Soft | reservoir |
| SeaTac, Washington | 70.5 mg/L | 3.1 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How White Center compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ White Center | 23 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes White Center's Water Unique?
Local geology and source profile
White Center, Washington, in King County — a King County community adjacent to Burien and Seattle in the southwest Seattle metro — receives its water from Seattle Public Utilities, drawing from the Cedar River or South Fork Tolt River reservoir (King County) through the Seattle metro distribution.
The very soft 23 mg/L hardness and very low TDS of 38.6 mg/L place White Center among the softest water cities in this dataset — driven by the Cascade Mountains' Oligocene Ohanapecosh volcanic and Eocene Puget Group insoluble bedrock watershed, which yields almost zero mineral dissolution, producing the famously pure and soft Seattle Cascade mountain supply. The Cedar River-Tolt watershed at King County — Oligocene Ohanapecosh Formation (insoluble — primary dilutant), Eocene Puget Group basalt (insoluble — dilutant), and minor Pleistocene glacial drift (slightly calcareous — trace contributor).
At 23 mg/L, White Center's water is extremely soft — no scale buildup whatsoever, appliances last their full service life, and no softening is ever needed. Water is ideal for laundry and appliances. The PFAS level of 1.6 ppt is among the lowest in this dataset and is well below action levels — no PFAS filtration urgency for White Center.
Geology & Source: White Center in King County draws from the Seattle Public Utilities on Cedar River or South Fork Tolt River reservoir (King County, west-central Washington) — the Cedar River watershed drains the Cascades (Oligocene Ohanapecosh Formation — insoluble) and Eocene Puget Group (insoluble) — Washington King County Cedar River-Tolt Oligocene-Eocene insoluble Cascades supply produces very soft water at 23 mg/L with TDS 38.6 mg/L.