Sherwood Water Hardness & Quality Report (2026)

Sherwood, Oregon, in Washington County — a Washington County city in the Tualatin Valley adjacent to Tualatin and King City, part of the Portland south metropolitan area in the rapidly growing Washington County suburban belt — receives its municipal water from the Tualatin Valley Water District (TVWD), drawing from the Tualatin River or the Joint Water Commission (Tualatin Valley-Bull Run supply blend, Portland metro west side).

The very soft 40 mg/L hardness and very low TDS of 74.2 mg/L reflect the Tualatin Valley's Coast Range basalt watershed character — very similar to the Portland Bull Run supply (20-50 mg/L). The Tualatin River drains the Tualatin Mountains (Portland West Hills — Eocene Columbia River Basalt) and the western Coast Range (Eocene basalt and sediment — largely insoluble volcanic terrain). The Portland-Tualatin Valley supply system (Joint Water Commission, Bull Run-Tualatin blend) produces the characteristically very soft water of the Portland metro, reflecting the Oregon Coast Range's almost entirely insoluble volcanic basalt geology.

At 40 mg/L, Sherwood's water is very soft — essentially no scale forms, soap lathers abundantly, and appliances maintain maximum efficiency. Annual descaling is more than sufficient. The PFAS level of 1.6 ppt is excellent — one of the lowest in any Pacific Northwest metropolitan community, reflecting the Coast Range volcanic watershed's protected, pristine character and the very limited direct military-industrial PFAS sources in the Tualatin Valley watershed.