Water Hardness in Oregon
How to read the Oregon results
State pages are screening and comparison hubs. They summarize ZIP, city, and water-system patterns so you can find the local page that best matches your home or utility.
Use the source coverage below to judge how much local confirmation a specific city or ZIP needs. The methodology page explains the source hierarchy, weighting, and limitations.
Data Source Coverage
ZIP-level source mix for Oregon; higher direct and USGS coverage means less reliance on regional estimates.
In Oregon, 46% of ZIPs use verified treated-water records, 17% use high-confidence USGS monitoring, and 37% use estimates that should be confirmed locally for treatment decisions.
What the Data Shows in Oregon
Most classified ZIPs in Oregon are below the hard-water threshold, though local systems can still vary.
Oregon uses a mixed data profile across treated-water records, USGS monitoring, and estimated fallback values.
Use the city table below to compare local results. For estimated locations or unusually high readings, confirm with your utility or a home hardness test before sizing treatment equipment.
ZIP Hardness Distribution
Treatment Takeaway
Hardness treatment is less likely to be needed statewide, but local water systems can still differ from the state pattern. Test first if you see scale or spotting.
How to Use This Data
Use the source coverage above to decide how much local confirmation you need for a specific city or ZIP code.
Useful Oregon City Pages
Shortcuts to city pages backed by more ZIP-code or water-system data.
Cities With More Local Data
Prioritize cities with multiple ZIPs and systems, then use source badges on each city page to separate verified treated-water records from estimates.
Top 10 Hardest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Harbor | Very Hard (307 PPM) |
| 2 | Agness | Very Hard (284 PPM) |
| 3 | Pistol River | Very Hard (284 PPM) |
| 4 | Sixes | Very Hard (284 PPM) |
| 5 | Arlington | Very Hard (275 PPM) |
| 6 | Langlois | Hard (243 PPM) |
| 7 | Canyon City | Hard (218 PPM) |
| 8 | Bates | Moderately Hard (176 PPM) |
| 9 | Kimberly | Moderately Hard (176 PPM) |
| 10 | Port Orford | Moderately Hard (163 PPM) |
Top 10 Softest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Aloha | Soft (12 PPM) |
| 2 | Beavercreek | Soft (12 PPM) |
| 3 | Beaverton | Soft (12 PPM) |
| 4 | Brightwood | Soft (12 PPM) |
| 5 | Buxton | Soft (12 PPM) |
| 6 | Colton | Soft (12 PPM) |
| 7 | Corbett | Soft (12 PPM) |
| 8 | Cornelius | Soft (12 PPM) |
| 9 | Eagle Creek | Soft (12 PPM) |
| 10 | Gales Creek | Soft (12 PPM) |
All Cities in Oregon
City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.