Water Hardness in Missouri

115 counties — Average 222 PPM (Very Hard)

1
6
36
72
Soft (0.9%) Moderate (5.2%) Hard (31.3%) Very Hard (62.6%)

Missouri Water Hardness Map

Soft   Moderate   Hard   Very Hard

Hardest Water Counties

Andrew194 PPM
Atchison265 PPM
Audrain270 PPM
Benton240 PPM
Boone408 PPM
Buchanan255 PPM
Caldwell315 PPM
Callaway290 PPM
Camden220 PPM
Cape Girardeau200 PPM
Carroll295 PPM
Cass219 PPM
+60 more
Missouri

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All 115 Counties — By Water Hardness

CountyClassificationHardness
Adair Hard 137 PPM
Andrew Very Hard 194 PPM
Atchison Very Hard 265 PPM
Audrain Very Hard 270 PPM
Barry Hard 144 PPM
Barton Moderate 120 PPM
Bates Hard 180 PPM
Benton Very Hard 240 PPM
Bollinger Moderate 105 PPM
Boone Very Hard 408 PPM
Buchanan Very Hard 255 PPM
Butler Hard 127 PPM
Caldwell Very Hard 315 PPM
Callaway Very Hard 290 PPM
Camden Very Hard 220 PPM
Cape Girardeau Very Hard 200 PPM
Carroll Very Hard 295 PPM
Carter Hard 170 PPM
Cass Very Hard 219 PPM
Cedar Hard 160 PPM
Chariton Hard 164 PPM
Christian Hard 170 PPM
Clark Very Hard 250 PPM
Clay Very Hard 525 PPM
Clinton Very Hard 280 PPM
Cole Hard 140 PPM
Cooper Hard 167 PPM
Crawford Hard 180 PPM
Dade Very Hard 201 PPM
Dallas Hard 174 PPM
Daviess Very Hard 270 PPM
DeKalb Very Hard 325 PPM
Dent Hard 180 PPM
Douglas Very Hard 214.5 PPM
Dunklin Hard 128 PPM
Franklin Hard 140 PPM
Gasconade Very Hard 245 PPM
Gentry Very Hard 380 PPM
Greene Very Hard 213 PPM
Grundy Hard 176 PPM
Harrison Very Hard 221 PPM
Henry Very Hard 712.5 PPM
Hickory Hard 130 PPM
Holt Very Hard 240 PPM
Howard Very Hard 240 PPM
Howell Very Hard 210 PPM
Iron Hard 160 PPM
Jackson Very Hard 260 PPM
Jasper Hard 180 PPM
Jefferson Very Hard 210 PPM
Johnson Very Hard 220 PPM
Knox Very Hard 320 PPM
Laclede Very Hard 196 PPM
Lafayette Very Hard 240 PPM
Lawrence Hard 163.5 PPM
Lewis Very Hard 200 PPM
Lincoln Hard 169 PPM
Linn Very Hard 240 PPM
Livingston Very Hard 190 PPM
Macon Very Hard 1000 PPM
Madison Moderate 93.6 PPM
Maries Very Hard 270 PPM
Marion Very Hard 181 PPM
McDonald Hard 140 PPM
Mercer Very Hard 211 PPM
Miller Very Hard 270 PPM
Mississippi Hard 151 PPM
Moniteau Very Hard 260 PPM
Monroe Very Hard 190 PPM
Montgomery Very Hard 221 PPM
Morgan Very Hard 270 PPM
New Madrid Hard 127 PPM
Newton Hard 140 PPM
Nodaway Very Hard 220 PPM
Oregon Very Hard 205 PPM
Osage Very Hard 290 PPM
Ozark Very Hard 200 PPM
Pemiscot Soft 34 PPM
Perry Very Hard 200 PPM
Pettis Very Hard 280 PPM
Phelps Hard 172.5 PPM
Pike Very Hard 204.5 PPM
Platte Very Hard 190 PPM
Polk Very Hard 200.5 PPM
Pulaski Very Hard 207 PPM
Putnam Very Hard 200 PPM
Ralls Moderate 117 PPM
Randolph Very Hard 334 PPM
Ray Very Hard 375 PPM
Reynolds Hard 130 PPM
Ripley Hard 161 PPM
Saline Very Hard 290 PPM
Schuyler Very Hard 200 PPM
Scotland Very Hard 270 PPM
Scott Hard 144 PPM
Shannon Hard 170 PPM
Shelby Hard 165 PPM
St. Charles Very Hard 258 PPM
St. Clair Very Hard 200 PPM
St. Francois Very Hard 447 PPM
St. Louis Very Hard 220 PPM
St. Louis Very Hard 225.5 PPM
Ste. Genevieve Hard 155 PPM
Stoddard Very Hard 190 PPM
Stone Hard 136 PPM
Sullivan Hard 180 PPM
Taney Moderate 115 PPM
Texas Hard 163 PPM
Vernon Very Hard 200 PPM
Warren Very Hard 280 PPM
Washington Very Hard 230 PPM
Wayne Moderate 114 PPM
Webster Hard 170 PPM
Worth Very Hard 218.5 PPM
Wright Very Hard 208.5 PPM

Source: USGS Water Quality Portal

Frequently Asked Questions

How hard is the water in Missouri?

Missouri has an average water hardness of 222 PPM, classified as very hard. Out of 115 counties, 1 have soft water, 6 moderately hard, 36 hard, and 72 very hard.

Which Missouri counties have the hardest water?

Missouri has 72 counties with very hard water (above 180 mg/L). See the county table above for a complete breakdown by hardness level.

How do I check water hardness for my Missouri address?

Enter your ZIP code in the search box above to see your area's estimated water hardness, classification, and water utility information.