Beaverton Water Hardness & Quality Report (2026)

Beaverton, Oregon, the second-largest city in the Portland metropolitan area in Washington County, draws its municipal water supply through the Joint Water Commission (JWC) — the cooperative water agency of Beaverton, Hillsboro, and Forest Grove — sourcing from Henry Hagg Lake (Scoggins Reservoir on Scoggins Creek — a Tualatin River tributary) in Washington County, and from the Portland Water Bureau Bull Run Watershed system via wholesale water deliveries. Beaverton also draws from the Tualatin Valley Water District network in parts of the city. Water hardness measures 57 mg/L — classified as moderately soft.

Beaverton's moderately soft supply is essentially identical to neighboring Hillsboro (54 mg/L) — both served by the same Joint Water Commission system from the same source waters. Henry Hagg Lake–Scoggins Creek watershed drains the Oregon Coast Range — the Columbia River Basalt Group (CRBG) basalt, Oligocene–Miocene volcanic and sedimentary sequences of the Tualatin Basin margin — terrain mineralogically dominated by mafic volcanic rock with negligible carbonate content. The Portland Water Bureau Bull Run supplemental water adds additional very soft Cascade Range volcanic watershed supply. The JWC treatment system consistently produces moderately soft finished water across the Washington County distribution zones.

With hardness at 57 mg/L, Beaverton residents experience minimal to moderate scale challenges. Faucet aerators and showerheads develop deposits slowly — bi-monthly cleaning with citric acid solution is sufficient. Dishwashers produce clean glassware. Joint Water Commission and Portland Water Bureau consistently deliver water meeting all Oregon DEQ and EPA Safe Drinking Water Act requirements.