Salem Water Hardness & Quality Report (2026)

The City of Salem Public Works Department operates the water utility serving over 175,000 residents in Marion and Polk Counties, primarily within the city limits and surrounding areas including the Suburban East Salem Water District. Water is sourced from the North Santiam River at the Geren Island Water Treatment Plant, located 27 miles downstream from Detroit Dam. The utility manages intake, treatment, and distribution for this surface water supply, which originates as snowmelt from the Cascade Mountains.

The North Santiam River watershed spans the Cascade Range, with headwaters in forested volcanic highlands feeding into the river basin. The geology features Tertiary volcanic rocks including basalt flows and andesitic deposits, with overlying Quaternary glacial till and alluvial sands that provide natural filtration. This snowmelt-dominated hydrology and low-carbonate geology — characteristic of the Western Cascades geologic province — produce very soft water with minimal dissolved minerals from limited rock leaching in the watershed.

Salem's very soft water poses no risk of scale buildup in pipes, appliances, or fixtures, sparing water heaters, dishwashers, and washing machines from mineral deposits that shorten lifespan and raise energy costs. Soap lathers easily without excess, and skin feels less dry compared to harder supplies. No water softener is required or recommended; focus maintenance on regular filter changes and corrosion checks due to low mineral buffering. Treatment includes filtration, ozone disinfection, chlorination, fluoridation, and soda ash for pH adjustment. Independent reviews report a C+ overall quality score, with detections of Chromium-6, combined Radium, and total trihalomethanes (TTHMs) above health advocacy guidelines though within legal limits.