Dallas Water Hardness & Quality Report (2026)

Dallas, Oregon, in Polk County — the Polk County seat adjacent to Independence and Monmouth in the mid-Willamette Valley of northwest Oregon — receives its municipal water from the Dallas Water Division, drawing from Rickreall Creek (Polk County, draining the Oregon Coast Range) through the mid-Willamette Valley water treatment system.

The moderately soft 92.5 mg/L hardness and TDS of 231.7 mg/L reflect the northwest Oregon Coast Range watershed's moderate volcanic and sedimentary character — somewhat harder than the pure Cascade-fed communities (The Dalles: 22.5 mg/L; Corvallis: ~40 mg/L) due to the Eocene marine sedimentary and tuffaceous input from the Coast Range. The Rickreall Creek (Polk County) drains the Oregon Coast Range — Eocene Siletz River Volcanics (basalt — insoluble), Eocene Tyee Formation (calcareous marine sandstone — moderate hardness contributor), and Eocene Spencer Formation (slightly calcareous marine tuff). The Eocene marine calcareous Coast Range sedimentary input produces the moderately soft Oregon supply.

At 92.5 mg/L, Dallas' water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 2.6 ppt is low — the Polk County northwest Oregon Willamette Valley agricultural corridor has limited major AFFF military PFAS sources, and the Coast Range watershed is relatively pristine.