Water Hardness in Oregon

36 counties — Average 65 PPM (Moderately Hard)

22
11
1
2
Soft (61.1%) Moderate (30.6%) Hard (2.8%) Very Hard (5.6%)

Oregon Water Hardness Map

Soft   Moderate   Hard   Very Hard

Hardest Water Counties

Malheur277 PPM
Morrow235 PPM
Oregon

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All 36 Counties — By Water Hardness

CountyClassificationHardness
Baker Moderate 99 PPM
Benton Soft 43.2 PPM
Clackamas Soft 27.2 PPM
Clatsop Soft 33.9 PPM
Columbia Soft 52.9 PPM
Coos Soft 30 PPM
Crook Moderate 118 PPM
Curry Soft 38 PPM
Deschutes Soft 31.4 PPM
Douglas Soft 40.7 PPM
Gilliam Moderate 95.9 PPM
Grant Moderate 104 PPM
Harney Soft 58.8 PPM
Hood River Soft 26 PPM
Jackson Moderate 83 PPM
Jefferson Soft 44 PPM
Josephine Moderate 64 PPM
Klamath Soft 45.1 PPM
Lake Soft 51.2 PPM
Lane Soft 18 PPM
Lincoln Soft 22 PPM
Linn Soft 21 PPM
Malheur Very Hard 277 PPM
Marion Soft 51 PPM
Morrow Very Hard 235 PPM
Multnomah Moderate 65 PPM
Polk Soft 24 PPM
Sherman Moderate 65.5 PPM
Tillamook Soft 22.8 PPM
Umatilla Hard 140 PPM
Union Soft 42 PPM
Wallowa Soft 26 PPM
Wasco Moderate 68 PPM
Washington Moderate 61 PPM
Wheeler Moderate 76 PPM
Yamhill Soft 38.8 PPM

Source: USGS Water Quality Portal

Frequently Asked Questions

How hard is the water in Oregon?

Oregon has an average water hardness of 65 PPM, classified as moderately hard. Out of 36 counties, 22 have soft water, 11 moderately hard, 1 hard, and 2 very hard.

Which Oregon counties have the hardest water?

Oregon has 2 counties with very hard water (above 180 mg/L). See the county table above for a complete breakdown by hardness level.

How do I check water hardness for my Oregon address?

Enter your ZIP code in the search box above to see your area's estimated water hardness, classification, and water utility information.