Altamont Water Hardness & Quality Report (2026)

Altamont, Oregon, in Klamath County — an unincorporated Klamath County community adjacent to Klamath Falls in the upper Klamath Basin in south-central Oregon, at the transition between the High Cascades and the Great Basin — receives its municipal water from the Klamath Falls Water Division, drawing from the Klamath River system or Upper Klamath Lake in the Klamath Basin.

The moderately soft 71 mg/L hardness and TDS of 158.2 mg/L reflect the Klamath Basin's Oregon High Cascades volcanic character. The Klamath Basin drains the High Cascades — Quaternary Cascade volcanics (basalt and andesite — relatively insoluble) and the Tertiary Western Cascades volcanic terrain. The Upper Klamath Lake watershed draws from the Cascade volcanic highlands, producing moderately soft water that is typical of the Oregon Cascades-Basin and Range transition. The Klamath Basin's volcanic geology (basalt-dominated) produces a somewhat higher TDS than pure Western Cascade supplies due to the Basin and Range transition and higher volcanic mineral content.

At 71 mg/L, Altamont's water is moderately soft — comfortable for household use. Scale forms slowly, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 2.1 ppt is excellent — reflecting the Klamath Basin's remote, pristine volcanic watershed, the very limited direct military-industrial PFAS sources in the upper Klamath corridor, and the Oregon Cascades' protected forest character.