Kennewick Water Hardness & Quality Report (2026)
Water Hardness
4.4 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
193.9 mg/L
Est. Daily Cost
$0.20
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 Kennewick, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Kennewick | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.6 yrs | 15 yrs | -16% |
Regional Water Comparison
How Kennewick compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Kennewick, Washington | 75.5 mg/L | 3.2 ppt | 🟡 Moderately Hard | reservoir |
| Pasco, Washington | 47.5 mg/L | 2.3 ppt | 🟢 Soft | reservoir |
| Tri-Cities, Washington | 26 mg/L | 1.6 ppt | 🟢 Soft | reservoir |
| Richland, Washington | 31.5 mg/L | 1.8 ppt | 🟢 Soft | reservoir |
| West Richland, Washington | 20.5 mg/L | 1.4 ppt | 🟢 Soft | reservoir |
National Benchmark
How Kennewick compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kennewick | 75.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Kennewick's Water Unique?
Local geology and source profile
Kennewick, Washington — the largest of the Tri-Cities (with Richland and Pasco) in Benton County at the confluence of the Columbia, Yakima, and Snake Rivers — draws its municipal water supply from the Columbia River via the City of Kennewick Utilities Division Water Department, treating Columbia River water at the Kennewick Water Treatment Plant serving the Kennewick metropolitan area. Kennewick is situated at the iconic Tri-Cities Columbia River confluence. Water hardness in Kennewick measures 75.5 mg/L — classified as soft.
Kennewick's soft supply reflects the Columbia River's dominantly basaltic watershed character at the Tri-Cities reach. The Columbia River drainage above Kennewick spans the Columbia Plateau — underlain overwhelmingly by the Columbia River Basalt Group (Miocene Grande Ronde Basalt, Wanapum Basalt, and Saddle Mountains Basalt — massive flood basalt formations 6–17 million years old that cover eastern Washington in basalt flows up to 6,000 feet thick). Basalt is calcium-poor compared to carbonate formations — it weathers to produce silicic soil rather than calcareous dissolution products. The Snake River and Yakima River tributaries add some mineral content, but the basalt-dominated Columbia Plateau watershed keeps finished hardness low in the Tri-Cities area.
With hardness at 75.5 mg/L, Kennewick residents enjoy soft water with minimal scale challenges. Faucet aerators and showerheads develop deposits slowly. City of Kennewick Utilities consistently delivers water meeting all Washington DOH and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Columbia River via the City of Kennewick Utilities Division Water Department — the Columbia River Basalt Group (Miocene Grande Ronde and Wanapum Basalt) volcanic plateau terrain of the Columbia Plateau and minimal carbonate input from the basaltic terrain; soft supply at 75.5 mg/L in Benton County at the Tri-Cities confluence.