Lebanon Water Hardness & Quality Report (2026)

City of Lebanon Water Utility serves approximately 16,000–17,000 residents in Lebanon, Oregon, located in Linn County within the Willamette Valley. The utility sources its drinking water exclusively from surface water, delivering it through approximately 80 miles of distribution mains ranging from 2 to 16 inches in diameter. Surface water undergoes conventional treatment including filtration and disinfection to maintain compliance with EPA legal standards. Contact the utility at (541) 258-4913 or (541) 258-4253 for water inquiries, with after-hours emergencies at (541) 451-0101.

Lebanon's supply originates in the South Santiam River watershed, part of the broader Willamette River basin draining the western slopes of the Cascade Range. The geology is dominated by volcanic terrains of the Western Cascades, with Oligocene to Pleistocene basalt flows, tuffaceous sediments, and minor intrusive rocks forming the bedrock. This volcanic-dominated geology produces soft water with low dissolved solids, as rainwater percolates quickly through fractured lavas without picking up significant hardness ions from carbonate rocks.

Soft water minimizes scale buildup in pipes, water heaters, and appliances, reducing energy costs and maintenance compared to harder supplies. Dishwashers and washing machines experience less limescale, though soap usage may increase slightly due to low mineral content. Routine flushing of hot water systems is sufficient; a water softener is not recommended and could over-treat this naturally soft profile, potentially increasing corrosion risks. Independent analyses note arsenic, nitrate, and total trihalomethanes (TTHMs) exceed health advocacy guidelines while remaining within EPA maximums; the utility confirms water is safe per regulatory standards.