Ontario Water Hardness & Quality Report (2026)
Water Hardness
3.2 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
108.1 mg/L
Est. Daily Cost
$0.15
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 Ontario, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Ontario | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.8 yrs | 8.5 yrs | -8% |
| Washing Machine | 11.6 yrs | 12 yrs | -3% |
| Water Heater | 13.4 yrs | 15 yrs | -11% |
Regional Water Comparison
How Ontario compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Ontario, Oregon | 54.5 mg/L | 1.8 ppt | 🟢 Soft | reservoir |
| Caldwell, Idaho | 109.5 mg/L | 2.3 ppt | 🟡 Moderately Hard | reservoir |
| Nampa, Idaho | 53.5 mg/L | 1.5 ppt | 🟢 Soft | reservoir |
| Eagle, Idaho | 61.5 mg/L | 1.6 ppt | 🟡 Moderately Hard | reservoir |
| Meridian, Idaho | 113.5 mg/L | 2.3 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Ontario compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Ontario | 54.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Ontario's Water Unique?
Local geology and source profile
Ontario, Oregon, in Malheur County — the Malheur County seat adjacent to Nyssa and Vale on the Snake River in eastern Oregon near the Idaho border — receives its water from the City of Ontario Water Department, drawing from Owyhee Reservoir through the east-central Oregon distribution.
The soft 54.5 mg/L hardness and TDS of 108.1 mg/L reflect the Malheur County Owyhee supply's soft character — the Triassic Olds Ferry Terrane is largely insoluble volcanic and metamorphic basement, and Quaternary Snake River alluvium contributes only minimal calcareous mineral content from its arid-region basalt drainage (compare Nyssa OR: 52/103 in Malheur County comparable; Vale OR: 56/112 in Malheur County comparable; Ontario consistent soft from the same Malheur County Owyhee Reservoir Triassic insoluble supply). The Owyhee watershed — Triassic Olds Ferry Terrane (insoluble — primary dilutant), Quaternary Snake River alluvium (slightly calcareous — primary hardness contributor), and Quaternary Owyhee alluvium (slightly calcareous — minor TDS).
At 54.5 mg/L with TDS 108, Ontario's water is soft — minimal scale buildup. Annual descaling is appropriate. The PFAS level of 1.8 ppt is very low — an excellent result for eastern Oregon. Review the City of Ontario's annual water quality report.
Geology & Source: Ontario in Malheur County draws from the Ontario Water on Owyhee Reservoir (Malheur County, east Oregon) — the Owyhee watershed drains Triassic Olds Ferry Terrane (insoluble) and Quaternary Snake River alluvium (slightly calcareous) — Oregon Malheur County Owyhee Reservoir Triassic insoluble supply produces soft water at 54.5 mg/L with TDS 108.1 mg/L.