Oregon vs California: Whose Tap Water Is Harder?
Water Hardness in Oregon (70 PPM) vs California (200 PPM) — a 96% gap between neighbors, explained with July 2026 data.
Oregon and California share a border, but for water hardness they don't share much else: Oregon averages 70 PPM (rank #7 of 51) and California averages 200 PPM (rank #38) as of July 2026 — a 96% gap between neighbors.
| Oregon | California | U.S. benchmark | |
|---|---|---|---|
| Average hardness | 70 PPM | 200 PPM | 120 PPM |
Oregon in context
Oregon averages 70 PPM — "moderately hard" on the USGS scale and 42% softer than the national average of 120 PPM (rank #7 of 51, 1 = softest). Most households here get by fine without a softener, though scale slowly accumulates in heaters and kettles.
California in context
California averages 200 PPM — "very hard" on the USGS scale and 67% harder than the national average of 120 PPM (rank #38 of 51, 1 = softest). At this level, scale buildup on heaters and fixtures is a when, not an if, and most households benefit from a softener.
Full local breakdowns: Oregon · California · all states ranked.
State averages hide huge local swings. A certified home water test kit tells you your exact hardness and what's dissolved in your water — before you spend a dollar on treatment.
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