West Linn Water Hardness & Quality Report (2026)

West Linn, Oregon, in Clackamas County — a major south Portland affluent suburban community (West Linn is a significant Clackamas County city — a south Portland suburb situated at the confluence of the Willamette and Tualatin Rivers; West Linn is one of the most affluent and desirable communities in the Portland metropolitan area — its location on the Willamette River bluffs above the river and adjacent to the Tualatin River gorge gives it exceptional natural scenery; West Linn is the home of the historic Willamette Falls (the Willamette Falls at Oregon City, immediately north of West Linn, is the largest waterfall by volume in the Pacific Northwest — historically one of the most important sites in Oregon for both Native American fishing culture and early industrial development)); West Linn is known for its large-lot residential neighborhoods, its proximity to the Willamette River, and its excellent public schools, a diverse Clackamas County community with a primarily professional, tech industry, and upper-middle-class suburban family population — draws its municipal water supply via the City of West Linn Water Division. Water hardness in West Linn measures 64 mg/L — classified as moderately soft.

West Linn's moderate softness reflects the south Portland Oregon Clackamas County Willamette River watershed's calcareous-poor character. The Clackamas River watershed drains the Quaternary calcareous-poor Willamette Valley alluvium with effective treatment, producing the moderately soft 64 mg/L.

With hardness at 64 mg/L, West Linn residents enjoy moderately soft water. City of West Linn Water Division consistently delivers water meeting all Oregon DEQ and EPA Safe Drinking Water Act requirements.