Bethany Water Hardness & Quality Report (2026)

Bethany, Oregon, in Washington County — an unincorporated Washington County community in the western Portland metro, one of the fastest-growing residential areas in Oregon, a newer planned community north of Beaverton adjacent to the Sunset Corridor (US 26) — receives its municipal water from the Tualatin Valley Water District (TVWD) or Portland Water Bureau, which draws from the Tualatin River Basin through the TVWD regional treatment system (treating Tualatin River and supplemental Willamette River sources) or from the Bull Run Watershed (Portland Water Bureau's Mount Hood supply).

The moderately soft 71.5 mg/L hardness and TDS of 160.3 mg/L reflect the Tualatin River watershed's Oregon Coast Range basalt geology — softer than typical limestone-dominated supplies but slightly harder than Portland's ultra-soft Bull Run supply (24.5 mg/L). The Tualatin River drains the Oregon Coast Range — terrain underlain by the Eocene Tillamook Volcanics (basalt and pillow basalt marine flows), the Paleocene-Eocene Siletz River Volcanics (ophiolitic oceanic basalt), and the Portland Hills Basalt (Miocene Columbia River Basalt). These volcanic basaltic rocks have minimal carbonate content, producing soft water. The moderate hardness (71.5 mg/L) reflects some plagioclase calcium from the basaltic terrain and the Tualatin Valley alluvial sediment contributions.

At 71.5 mg/L, Bethany's water is moderately soft — comfortable for household use. Scale forms slowly over many months, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 2.2 ppt is excellent — among the lowest in the Portland metro, reflecting the Tualatin watershed's relatively limited military-industrial PFAS sources and the Washington County corridor's predominantly semiconductor/tech-light manufacturing character.