Water Hardness in Oregon (OR)
Oregon has an average water hardness of 30 ppm (1.8 grains per gallon), which is classified as Soft . Oregon enjoys naturally soft water that requires no softening treatment. Residents benefit from easy soap lathering, spot-free dishes, and long-lasting plumbing and appliances. Water hardness varies between cities — from 10 ppm in Portland to 45 ppm in Medford.
Water Hardness by City in Oregon
The table below shows water hardness data for 8 cities in Oregon, sorted from hardest to softest. Click any city name for detailed information including water source, treatment recommendations, and estimated hard water costs.
| City | Hardness (PPM) | Grains/Gallon | Level | Water Source | pH | TDS | Utility |
|---|---|---|---|---|---|---|---|
| Medford | 45 ppm | 2.6 gpg | Soft | Surface | 7.1 | 68 | City of Medford Water Commission |
| Grants Pass | 35 ppm | 2 gpg | Soft | Surface | 7 | 55 | City of Grants Pass |
| Bend | 28 ppm | 1.6 gpg | Soft | Ground | 7 | 42 | City of Bend |
| Corvallis | 22 ppm | 1.3 gpg | Soft | Surface | 6.9 | 35 | City of Corvallis Public Works |
| Albany | 20 ppm | 1.2 gpg | Soft | Surface | 6.9 | 32 | City of Albany Public Works |
| Salem | 18 ppm | 1.1 gpg | Soft | Surface | 6.9 | 28 | City of Salem Public Works |
| Eugene | 15 ppm | 0.9 gpg | Soft | Surface | 6.8 | 24 | Eugene Water and Electric Board |
| Portland | 10 ppm | 0.6 gpg | Soft | Surface | 6.8 | 18 | Portland Water Bureau |
Understanding Water Hardness in Oregon
Water Sources in Oregon
The majority of cities in Oregon draw their water from surface sources such as rivers, lakes, and reservoirs. Surface water generally contains fewer dissolved minerals than groundwater, which helps explain the overall hardness profile of the state. Cities that rely on surface water tend to have softer water because the water has less contact time with mineral-bearing rock formations underground.
Hardness Variation Across Oregon
Water hardness in Oregon ranges from 10 ppm in Portland to 45 ppm in Medford — a difference of 35 ppm. This variation means that treatment recommendations differ significantly between cities. Even the hardest water in Oregon is moderate enough that a water softener is optional rather than essential, though homeowners who value spotless dishes and softer-feeling water may still find one worthwhile. Meanwhile, Portland enjoys naturally soft water that needs no treatment at all — an advantage that saves residents money on both equipment and ongoing maintenance.
How Oregon Compares to Other States
Below is a comparison of Oregon with five states that have similar average water hardness levels. Understanding how your state compares can help you gauge whether your water is typical for the region or unusually hard or soft.
| State | Avg Hardness | Level | Cities |
|---|---|---|---|
| Oregon (OR) | 30 ppm | Soft | 8 |
| Rhode Island (RI) | 30 ppm | Soft | 8 |
| Connecticut (CT) | 35 ppm | Soft | 8 |
| Washington (WA) | 25 ppm | Soft | 8 |
| Hawaii (HI) | 40 ppm | Soft | 8 |
| Massachusetts (MA) | 20 ppm | Soft | 8 |
Find Your City's Water Hardness
Use our water hardness lookup tool to find your specific city in Oregon, or browse all 50 states to compare water hardness across the country. If your water is hard, visit our treatment solutions guide to find the right softener or conditioner for your home.