State distribution
Hardness across indexed ZIPs
Counts describe published ZIP profiles, not a population-weighted statewide sample.
Soft · 0–60 PPM42
Moderately hard · 61–120 PPM1
Hard · 121–180 PPM2
Very hard · 181+ PPM0
State water index
Oregon water hardness
Search 21 indexed communities and 56 ZIP profiles, then compare the underlying utility, source, distance, and reporting context.
Median regional evidence
35PPM
Soft
Indexed range 13.1–153.5 PPM
- ZIP profiles
- 56
- Cities
- 21
- Matched utilities
- 21
- Counties
- 16
Understanding Oregon
Why local comparisons matter here
Oregon's west-side communities often use Cascade and Coast Range surface waters, while central and eastern areas include volcanic and basin groundwater systems.
In this index, soft is the largest category, covering 42 of 45 profiles with hardness data. The state median is 35 PPM, but the full indexed range is 13.1–153.5 PPM.
Evidence coverage
What the current records support
- Hardness estimate
- 80%
- Lead 90th percentile
- 100%
- Copper 90th percentile
- 57%
7
Low-confidence hardness profiles
34
Research-comparison eligible profiles
Reported source water
Utility source mix
- Surface water
- 13
- Groundwater
- 8
Highest medians
Highest eligible city medians
- 1. Portland35 PPM
Lowest medians
Lowest eligible city medians
- 1. Portland35 PPM
City directory
Explore Oregon by city
Search by city or county, then sort by name, hardness, or ZIP coverage.
21 cities · 56 ZIP profiles
21 cities found
Ashland
Jackson County · 1 ZIP
43PPM regional
Single regional valueNo active flag
Banks
Washington County · 1 ZIP
35PPM regional
Single regional valueNo active flag
Elgin
Union County · 1 ZIP
31PPM regional
Single regional valueNo active flag
Eugene
Lane County · 5 ZIPs
13PPM regional
Single regional valueNo active flag
Gervais
Marion County · 1 ZIP
—
No regional sampleNo active flag
Glide
Douglas County · 2 ZIPs
32PPM regional
Single regional valueNo active flag
Hines
Harney County · 1 ZIP
61PPM regional
Single regional valueNo active flag
Independence
Polk County · 1 ZIP
—
No regional sampleNo active flag
Klamath Falls
Klamath County · 1 ZIP
27PPM regional
Single regional valueNo active flag
Lake Oswego
Clackamas County · 2 ZIPs
37PPM regional
Regional range 36.3–37.2No active flag
Mcminnville
Yamhill County · 1 ZIP
37PPM regional
Single regional valueNo active flag
Medford
Jackson County · 2 ZIPs
154PPM regional
Single regional valueNo active flag
North Plains
Washington County · 1 ZIP
37PPM regional
Single regional valueNo active flag
Portland
Multnomah County · 29 ZIPs
35PPM regional
Regional range 32.5–37.81 active record
Rainier
Columbia County · 1 ZIP
21PPM regional
Single regional valueNo active flag
Redmond
Deschutes County · 1 ZIP
—
No regional sampleNo active flag
Rickreall
Polk County · 1 ZIP
—
No regional sampleNo active flag
Seaside
Clatsop County · 1 ZIP
—
No regional sampleNo active flag
Stayton
Marion County · 1 ZIP
18PPM regional
Single regional valueNo active flag
Sunriver
Deschutes County · 1 ZIP
—
No regional sampleNo active flag
Toledo
Lincoln County · 1 ZIP
—
No regional sampleNo active flag
County comparison
Highest regional-evidence county medians
| County | Median | Range | ZIP profiles |
|---|---|---|---|
| Jackson County | 154 PPM | 42.6–153.5 | 3 |
| Harney County | 61 PPM | 61.3–61.3 | 1 |
| Clackamas County | 37 PPM | 36.3–37.2 | 2 |
| Yamhill County | 37 PPM | 37.2–37.2 | 1 |
| Washington County | 36 PPM | 35.3–37.2 | 2 |
| Multnomah County | 35 PPM | 32.5–37.8 | 29 |
| Douglas County | 32 PPM | 31.5–31.5 | 2 |
| Union County | 31 PPM | 30.7–30.7 | 1 |
| Klamath County | 27 PPM | 27.4–27.4 | 1 |
| Columbia County | 21 PPM | 20.6–20.6 | 1 |
| Marion County | 18 PPM | 18.4–18.4 | 2 |
| Lane County | 13 PPM | 13.1–13.1 | 5 |