Lents Water Hardness & Quality Report (2026)

Lents, a neighborhood in southeast Portland, Oregon, receives its water from the Portland Water Bureau (PWB) and the Joint Water Commission (JWC), serving Multnomah County. Primary supply comes from Bull Run Watershed reservoirs in the Mount Hood National Forest, treated at the Bull Run Treatment Plant. During dry periods, JWC blends in groundwater from the Tualatin Valley, treated at the Cooper Mountain or Tigard facilities. This mixed surface and groundwater system provides reliable supply to over 1.5 million regional residents, including Lents.

The Bull Run Watershed spans 102 square miles of protected forest in the western Cascade Mountains, with headwaters in oligotrophic reservoirs fed by rain and snowmelt. The geology features permeable volcanic terrains of the Western Cascades province, including Eocene to Miocene basalt flows and lahar deposits, with no significant carbonate formations. JWC groundwater taps unconfined alluvial aquifers in Pleistocene Willamette Valley sediments overlying Columbia River Basalts. This volcanic-dominated geology imparts a very soft water character, naturally low in minerals due to limited ion exchange with sedimentary rocks.

As soft water, Lents' supply causes minimal scaling on fixtures or in appliances like dishwashers and water heaters, reducing maintenance needs and extending equipment life without softener intervention. No significant buildup occurs in pipes, and soap and detergent efficiency benefits from the low mineral content. Water softeners are unnecessary and not recommended, as they could over-treat already low-mineral water. The Portland Water Bureau reports consistent pH of 7.5–8.5 with corrosion control via orthophosphate, achieving full lead and copper rule compliance. Treatment includes microfiltration, UV disinfection, and chloramination, with activated carbon managing occasional taste and odor issues from low-level geosmin.