Keizer Water Hardness & Quality Report (2026)

Keizer, Oregon, in Marion County adjacent to Salem — a major Salem suburban community, one of Oregon's fastest-growing cities (Keizer has been among the fastest-growing Oregon cities for several decades — a planned suburban community on the north side of Salem), a primarily residential city in the Willamette Valley, and a diverse Marion County community with a significant Latino-American population in the Willamette Valley agricultural corridor — draws its municipal water supply from the North Santiam River and Willamette River via the City of Keizer Water Division (connected to the Salem water system). Water hardness in Keizer measures 83 mg/L — classified as moderately soft.

Keizer's moderate softness reflects the Willamette Valley North Santiam watershed's calcareous-poor Cascades volcanic geology. The North Santiam River (Detroit Reservoir) drains: the Western Cascades (Eocene–Oligocene calcareous-poor Cascades volcanic basalt, andesite, and tuff — the calcareous-poor Western Cascades volcanic sequence); and the High Cascades (Quaternary calcareous-poor Cascade basalt and andesite). The calcareous-poor Cascades volcanic watershed and City of Keizer–Salem treatment produce the moderate 83 mg/L.

With hardness at 83 mg/L, Keizer residents enjoy moderately soft water. City of Keizer Water Division consistently delivers water meeting all Oregon DEQ and EPA Safe Drinking Water Act requirements.