Missouri water hardness

Understanding Missouri

Why local comparisons matter here

Missouri spans the carbonate-rich Ozarks, northern plains, and the Missouri and Mississippi river corridors. Major cities and rural systems often use different source types.

In this index, very hard is the largest category, covering 477 of 556 profiles with hardness data. The state median is 236 PPM, but the full indexed range is 38.3–483 PPM.