La Grande Water Hardness & Quality Report (2026)
Water Hardness
1.2 grains per gallon
Source
reservoir
pH Level
7.1
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
31.4 mg/L
Est. Daily Cost
$0.05
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 La Grande, your appliances are currently losing 3% efficiency due to mineral buildup.
| Appliance | In La Grande | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.9 yrs | 8.5 yrs | — |
| Washing Machine | 12.9 yrs | 12 yrs | — |
| Water Heater | 14.8 yrs | 15 yrs | -1% |
Regional Water Comparison
How La Grande compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ La Grande, Oregon | 20 mg/L | 1.2 ppt | 🟢 Soft | reservoir |
| Pendleton, Oregon | 99.5 mg/L | 2.6 ppt | 🟡 Moderately Hard | reservoir |
| Walla Walla, Washington | 71.5 mg/L | 3 ppt | 🟡 Moderately Hard | reservoir |
| Hermiston, Oregon | 45.5 mg/L | 1.6 ppt | 🟢 Soft | reservoir |
| Pasco, Washington | 47.5 mg/L | 2.3 ppt | 🟢 Soft | reservoir |
National Benchmark
How La Grande compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ La Grande | 20 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes La Grande's Water Unique?
Local geology and source profile
La Grande, Oregon, in Union County — the Union County seat adjacent to Baker City and Pendleton on the Grande Ronde River in northeast Oregon — receives its water from the La Grande Water system, drawing from the Grande Ronde River watershed reservoir (Union County) through the northeast Oregon distribution.
The very soft 20 mg/L hardness and very low TDS of 31.4 mg/L place La Grande among the softest water cities in this dataset — reflecting the northeast Oregon Blue Mountains' insoluble Jurassic Wallowa Terrane and Miocene Columbia River Basalt watershed producing near-pure snowmelt runoff with negligible calcareous dissolution. The Grande Ronde watershed at Union County — Jurassic Wallowa Terrane (insoluble — primary dilutant from Blue Mountains), Miocene Columbia River Basalt Group (insoluble — secondary dilutant), and Quaternary valley alluvium (slightly calcareous — trace TDS contributor).
At 20 mg/L, La Grande's water is extremely soft — no scale buildup whatsoever, appliances run at peak efficiency, and no softening is ever needed. Water is ideal for all uses. The PFAS level of 1.2 ppt is extremely low — no filtration needed, routine monitoring is sufficient.
Geology & Source: La Grande in Union County draws from the La Grande Water on the Grande Ronde River watershed reservoir (Union County, northeast Oregon) — the Grande Ronde watershed at Union County drains the Blue Mountains (Jurassic Wallowa Terrane — insoluble) and Columbia River Basalt Group (insoluble) — Oregon Union County Grande Ronde Jurassic-Miocene insoluble volcanic supply produces very soft water at 20 mg/L with TDS 31.4 mg/L.