Oak Hills Water Hardness & Quality Report (2026)
Water Hardness
2 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
61.8 mg/L
Est. Daily Cost
$0.09
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 Oak Hills, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Oak Hills | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.3 yrs | 12 yrs | — |
| Water Heater | 14.2 yrs | 15 yrs | -5% |
Regional Water Comparison
How Oak Hills compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Oak Hills, Oregon | 34.5 mg/L | 1.5 ppt | 🟢 Soft | reservoir |
| Bethany, Oregon | 71.5 mg/L | 2.2 ppt | 🟡 Moderately Hard | reservoir |
| Cedar Mill, Oregon | 55 mg/L | 1.9 ppt | 🟢 Soft | reservoir |
| Aloha, Oregon | 68.5 mg/L | 2.1 ppt | 🟡 Moderately Hard | reservoir |
| Beaverton, Oregon | 57 mg/L | 1.9 ppt | 🟢 Soft | reservoir |
National Benchmark
How Oak Hills compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Oak Hills | 34.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Oak Hills's Water Unique?
Local geology and source profile
Oak Hills, Oregon, in Washington County — a Washington County unincorporated community adjacent to Beaverton and Hillsboro in the west Portland metro suburbs — receives its water from the Tualatin Valley Water District, drawing from the Bull Run watershed on Mount Hood through the northwest Oregon distribution.
The very soft 34.5 mg/L hardness and low TDS of 61.8 mg/L reflect the Washington County Bull Run supply's exceptionally soft Cascade volcanic character — the Quaternary Mount Hood andesite and Miocene Columbia River Basalt are both highly insoluble volcanic formations contributing negligible dissolved minerals to the pristine Bull Run watershed (compare Beaverton OR: 33/58 in Washington County comparable; Hillsboro OR: 36/65 in Washington County comparable; Oak Hills consistent very soft from the same Washington County Bull Run Cascade volcanic supply). The Bull Run watershed — Quaternary Mount Hood Cascade andesite (insoluble — primary dilutant), Miocene Columbia River Basalt (insoluble — secondary dilutant), and Quaternary Cascade glacial meltwater (insoluble — minimal TDS).
At 34.5 mg/L with TDS 62, Oak Hills has very soft water — virtually no scale buildup. Soft water can be corrosive — check for blue-green copper staining in older plumbing. The PFAS level of 1.5 ppt is very low — an excellent result for the Portland metro area. Review Tualatin Valley Water District's annual report.
Geology & Source: Oak Hills in Washington County draws from the Tualatin Valley Water on Bull Run watershed (Washington County, northwest Oregon) — the Bull Run watershed drains Quaternary Mount Hood Cascade andesite (insoluble) and Miocene Columbia River Basalt (insoluble) — Oregon Washington County Bull Run Cascade volcanic supply produces very soft water at 34.5 mg/L with TDS 61.8 mg/L.