Hayesville Water Hardness & Quality Report (2026)

Hayesville, Oregon, in Marion County — an unincorporated Marion County community in the northeastern Salem metropolitan area, adjacent to Salem and Keizer in the mid-Willamette Valley — receives its municipal water from the City of Salem Public Works Water Division, which draws from the North Santiam River at the Detroit Lake reservoir (a US Army Corps of Engineers impoundment on the North Santiam in the Western Cascades), serving the Salem metropolitan area including Hayesville.

The very soft 27.5 mg/L hardness and very low TDS of 47 mg/L are among the softest municipal supplies in the country — reflecting the North Santiam River's pristine Western Cascades volcanic watershed character. The North Santiam River originates in the Mount Jefferson Wilderness and the high Cascades — terrain dominated by Miocene-Pliocene High Cascades basalt, andesite, and pyroclastic volcanic deposits. These crystalline volcanic rocks contain essentially no carbonate minerals, and the North Santiam's protected watershed produces exceptionally soft, ultra-low-mineral water. Salem's North Santiam supply is regarded as one of the finest municipal water supplies in the Pacific Northwest.

At 27.5 mg/L, Hayesville's water is very soft — excellent for household use. Scale essentially never forms, soap lathers richly, and appliances maintain maximum efficiency. Annual descaling is more than sufficient. The PFAS level of 1.4 ppt is excellent — among the very lowest in any US metropolitan area, reflecting the North Santiam watershed's strict protection, the Mount Jefferson Wilderness area's pristine alpine character, and the limited direct military-industrial PFAS sources in the upper North Santiam basin.