Oregon City Water Hardness & Quality Report (2026)

Oregon City Water Department serves residents within Oregon City and portions of surrounding Clackamas County, Oregon, providing reliable drinking water through a municipal system. The utility draws from a mixed source: surface water from the Clackamas River watershed and groundwater from local wells tapping the Willamette Valley aquifer. River water is treated at a surface-water treatment plant using coagulation, filtration, and disinfection, while groundwater is disinfected and blended into the distribution system to meet peak-season demand across the service area.

The primary surface-water source lies within the Clackamas River watershed, draining volcanic and sedimentary terrain of the Cascade Range. These Miocene to Pleistocene volcanic rocks and associated sediments weather to release relatively low concentrations of calcium and magnesium, contributing a soft to slightly hard character. Groundwater is drawn from the Willamette Valley aquifer, an unconfined system of Quaternary alluvial sands and gravels over older marine sediments; percolation through these deposits adds modest mineral content, slightly elevating hardness compared with the river-derived supply.

At a slightly hard level, Oregon City's water may produce light scale buildup over time in water heaters, kettles, and showerheads, though effects are mild compared to hard or very hard supplies. Appliances such as tankless water heaters, coffee makers, and dishwashers benefit from periodic descaling, but whole-house water softeners are usually optional. Vinegar-based cleaning routines help extend appliance life. Annual quality reports confirm lead and copper compliance, chlorine or chloramine disinfection, and PFAS data showing low or non-detect levels consistent with the protected watershed.