Hardest Water in Oregon
48 cities ranked by water hardness. Hermiston tops the list at 50 PPM.
Oregon's water hardness varies significantly by city and water source. The state average across our database is 25 PPM, which is relatively soft. Most homes do not need a water softener. 0% of cities we track in Oregon have hardness above 120 PPM.
Astoria has the softest water at just 12 PPM. No softener is needed.
| # | City | PPM | GPG | Level | Softener? |
|---|---|---|---|---|---|
| 1 | Hermiston | 50 | 2.9 | Slightly Hard | No |
| 2 | Prineville | 48 | 2.8 | Slightly Hard | No |
| 3 | Pendleton | 45 | 2.6 | Slightly Hard | No |
| 4 | Klamath Falls | 42 | 2.5 | Slightly Hard | No |
| 5 | Redmond | 40 | 2.3 | Slightly Hard | No |
| 6 | La Grande | 38 | 2.2 | Slightly Hard | No |
| 7 | The Dalles | 35 | 2 | Slightly Hard | No |
| 8 | Hillsboro | 30 | 1.8 | Slightly Hard | No |
| 9 | Grants Pass | 30 | 1.8 | Slightly Hard | No |
| 10 | Woodburn | 30 | 1.8 | Slightly Hard | No |
| 11 | Medford | 28 | 1.6 | Slightly Hard | No |
| 12 | Central Point | 28 | 1.6 | Slightly Hard | No |
| 13 | Stayton | 28 | 1.6 | Slightly Hard | No |
| 14 | Eugene | 27 | 1.6 | Slightly Hard | No |
| 15 | Corvallis | 27 | 1.6 | Slightly Hard | No |
| 16 | McMinnville | 26 | 1.5 | Slightly Hard | No |
| 17 | Lebanon | 26 | 1.5 | Slightly Hard | No |
| 18 | Springfield | 25 | 1.5 | Slightly Hard | No |
| 19 | Forest Grove | 25 | 1.5 | Slightly Hard | No |
| 20 | Silverton | 25 | 1.5 | Slightly Hard | No |
| 21 | Beaverton | 24 | 1.4 | Slightly Hard | No |
| 22 | Newberg | 24 | 1.4 | Slightly Hard | No |
| 23 | Dallas | 24 | 1.4 | Slightly Hard | No |
| 24 | Gresham | 22 | 1.3 | Slightly Hard | No |
| 25 | Tualatin | 22 | 1.3 | Slightly Hard | No |
| 26 | Wilsonville | 22 | 1.3 | Slightly Hard | No |
| 27 | Canby | 22 | 1.3 | Slightly Hard | No |
| 28 | Roseburg | 22 | 1.3 | Slightly Hard | No |
| 29 | Tigard | 20 | 1.2 | Slightly Hard | No |
| 30 | Milwaukie | 20 | 1.2 | Slightly Hard | No |
| 31 | Sherwood | 20 | 1.2 | Slightly Hard | No |
| 32 | Cottage Grove | 20 | 1.2 | Slightly Hard | No |
| 33 | Albany | 19 | 1.1 | Slightly Hard | No |
| 34 | Oregon City | 19 | 1.1 | Slightly Hard | No |
| 35 | Happy Valley | 19 | 1.1 | Slightly Hard | No |
| 36 | Lake Oswego | 18 | 1.1 | Slightly Hard | No |
| 37 | West Linn | 18 | 1.1 | Slightly Hard | No |
| 38 | Hood River | 18 | 1.1 | Slightly Hard | No |
| 39 | St. Helens | 18 | 1.1 | Slightly Hard | No |
| 40 | Bend | 17 | 1 | Slightly Hard | No |
| 41 | Troutdale | 16 | 0.9 | Soft | No |
| 42 | Portland | 15 | 0.9 | Soft | No |
| 43 | Keizer | 15 | 0.9 | Soft | No |
| 44 | Ashland | 15 | 0.9 | Soft | No |
| 45 | Coos Bay | 15 | 0.9 | Soft | No |
| 46 | Salem | 14 | 0.8 | Soft | No |
| 47 | Sandy | 14 | 0.8 | Soft | No |
| 48 | Astoria | 12 | 0.7 | Soft | No |
Frequently Asked Questions
What is the average water hardness in Oregon?
Across 48 cities in our database, the average water hardness in Oregon is 25 PPM (1.5 GPG). This ranges from 12 PPM in Astoria to 50 PPM in Hermiston.
Do I need a water softener in Oregon?
It depends on your city. 0% of Oregon cities in our database (0 of 48) have hardness above 120 PPM where a softener provides measurable benefit. Check your specific city above.
Which Oregon city has the softest water?
Astoria has the softest water in Oregon at 12 PPM (0.7 GPG). No water softener is needed at this level.
What causes hard water in Oregon?
Hard water in Oregon is caused by dissolved calcium and magnesium from the local geology. Most of the state has favorable geology with granite, metamorphic, or volcanic rock that contributes minimal dissolved minerals.