Oak Grove 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
60.6 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 Grove, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Oak Grove | 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 Grove compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Oak Grove, Oregon | 34 mg/L | 1.5 ppt | 🟢 Soft | reservoir |
| Milwaukie, Oregon | 24.5 mg/L | 1.3 ppt | 🟢 Soft | reservoir |
| Lake Oswego, Oregon | 23.5 mg/L | 1.3 ppt | 🟢 Soft | reservoir |
| Oatfield, Oregon | 74.5 mg/L | 2.2 ppt | 🟡 Moderately Hard | reservoir |
| West Linn, Oregon | 64 mg/L | 2 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Oak Grove compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Oak Grove | 34 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 Grove's Water Unique?
Local geology and source profile
Oak Grove, Oregon, in Clackamas County — an unincorporated Clackamas County community adjacent to Milwaukie and Gladstone in the south Portland metro on the Willamette River — receives its municipal water from Clackamas River Water (North Clackamas County Water Commission) or the Portland Water Bureau, drawing from the Clackamas River (Clackamas County) through the Clackamas River treatment plant.
The very soft 34 mg/L hardness and very low TDS of 60.6 mg/L reflect the south Portland metro Clackamas River supply's nearly insoluble Cascade volcanic character. The Clackamas River drains the Cascade Range — Quaternary High Cascades basalt (moderately insoluble), Miocene Western Cascades andesite (low solubility volcanic), and Eocene Ohanapecosh Formation volcanic tuff (highly insoluble). The dominantly insoluble Western and High Cascades volcanic geology produces the very soft south Portland supply — softer than the Bull Run-fed north Portland communities.
At 34 mg/L, Oak Grove's water is very soft — essentially no scale forms, soap lathers very abundantly, and appliances maintain excellent efficiency. Annual descaling is sufficient. The PFAS level of 1.5 ppt is among the lowest in this dataset — the Clackamas County south Portland setting has very limited industrial PFAS sources near the Clackamas River watershed, and the Cascade Range headwaters are essentially pristine.
Geology & Source: Oak Grove in Clackamas County draws from Clackamas River Water on the Clackamas River (Clackamas County, northwest Oregon) — the Clackamas drains the Cascade Range (Quaternary High Cascades basalt, Miocene Western Cascades andesite — very low solubility volcanic) — Oregon Clackamas County Cascades volcanic watershed produces very soft water at 34 mg/L with TDS 60.6 mg/L in this Clackamas County Oregon community.