Water Hardness in Missouri
Across 426 measured cities — with 247 more covered by labeled county-level estimates — Missouri's median tap water hardness is 178.4 mg/L (10.4 gpg): hard on the USGS scale. Below: every covered city, the state's hardest and softest water, and the geology that explains it.
Data updated July 6, 2026. Sources: utility-reported water quality data and USGS/EPA Water Quality Portal samples.
State Median
178.4
mg/L (10.4 gpg), measured cities
Measured Range
4.8-567.4
mg/L across measured cities
Measured Cities
426
utility-reported or computed values
County Estimates
247
37% of covered cities
Missouri Cities by Hardness Category
Measured cities only — labeled county estimates never enter the category counts or the median.
| Category | Range | Measured cities | Share |
|---|---|---|---|
| Soft | 0-60 mg/L | 24 | 5.6% |
| Moderately hard | 60-120 mg/L | 73 | 17.1% |
| Hard | 120-180 mg/L | 120 | 28.2% |
| Very hard | >180 mg/L | 209 | 49.1% |
Hardest and Softest Water in Missouri
Measured values only; labeled county estimates and values under active dispute never rank.
Hardest water in Missouri
- Leadington — 567.4 mg/L (33.2 gpg), very hard
- Park Hills — 564.6 mg/L (33.0 gpg), very hard
- Leadwood — 486.1 mg/L (28.4 gpg), very hard
- Hughesville — 421.2 mg/L (24.6 gpg), very hard
- Alba — 384.8 mg/L (22.5 gpg), very hard
Softest water in Missouri
- Senath — 4.8 mg/L (0.3 gpg), soft
- Cardwell — 5.2 mg/L (0.3 gpg), soft
- Hornersville — 5.2 mg/L (0.3 gpg), soft
- Arbyrd — 5.4 mg/L (0.3 gpg), soft
- Holcomb — 18.8 mg/L (1.1 gpg), soft
Every Covered City in Missouri
All 673 covered Missouri cities, sorted by population served. "County estimate" rows are labeled context values from USGS/EPA Water Quality Portal county sampling — they never enter the median above. City names link to each city's full water quality page.
| City | Hardness (mg/L) | gpg | Category | Data |
|---|---|---|---|---|
| Chesterfield | 120.6 | 7.0 | Hard | Utility-reported |
| Champ | 121.0 | 7.1 | Hard | Utility-reported |
| Maryland Heights | 121.0 | 7.1 | Hard | Utility-reported |
| Blue Summit | 116.4 | 6.8 | Moderately hard | Utility-reported |
| Unity Village | 113.1 | 6.6 | Moderately hard | Utility-reported |
| Pleasant Valley | 118.6 | 6.9 | Moderately hard | Utility-reported |
| Raytown | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Belton | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Gladstone | 116.8 | 6.8 | Moderately hard | Utility-reported |
| Loch Lloyd | 116.0 | 6.8 | Moderately hard | Utility-reported |
| North Kansas City | 116.1 | 6.8 | Moderately hard | Utility-reported |
| Claycomo | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Lake Waukomis | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Platte Woods | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Ferrelview | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Birmingham | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Avondale | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Houston Lake | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Kansas City | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Oaks | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Oakview | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Oakwood | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Oakwood Park | 116.0 | 6.8 | Moderately hard | Utility-reported |
| Randolph | 116.0 | 6.8 | Moderately hard | Utility-reported |
| River Bend | 116.0 | 6.8 | Moderately hard | Utility-reported |
| St Louis | 109.0 | 6.4 | Moderately hard | Utility-reported |
| Riverview | 109.0 | 6.4 | Moderately hard | Utility-reported |
| St. Louis | 242.0 | 14.2 | Very hard | County estimate |
| Columbia | 190.3 | 11.1 | Very hard | Utility-reported |
| Springfield | 119.6 | 7.0 | Moderately hard | Utility-reported |
| Wentzville | 169.5 | 9.9 | Hard | Utility-reported |
| Dardenne Prairie | 116.5 | 6.8 | Moderately hard | Utility-reported |
| O'Fallon | 116.5 | 6.8 | Moderately hard | Utility-reported |
| Huntsdale | 161.3 | 9.4 | Hard | Utility-reported |
| McBaine | 161.3 | 9.4 | Hard | Utility-reported |
| Independence | 118.1 | 6.9 | Moderately hard | Computed from Ca+Mg |
| Sugar Creek | 118.1 | 6.9 | Moderately hard | Computed from Ca+Mg |
| Lee's Summit | 97.3 | 5.7 | Moderately hard | Utility-reported |
| Lees Summit | 97.3 | 5.7 | Moderately hard | Utility-reported |
| Lake St. Louis | 123.3 | 7.2 | Hard | Utility-reported |
| Cottleville | 120.5 | 7.0 | Hard | Utility-reported |
| Augusta | 118.0 | 6.9 | Moderately hard | Utility-reported |
| New Melle | 118.0 | 6.9 | Moderately hard | Utility-reported |
| Weldon Spring Heights | 118.0 | 6.9 | Moderately hard | Utility-reported |
| St. Joseph | 206.5 | 12.1 | Very hard | Computed from Ca+Mg |
| Arnold | 212.0 | 12.4 | Very hard | County estimate |
| Joplin | 144.5 | 8.4 | Hard | Computed from Ca+Mg |
| Cliff Village | 145.0 | 8.5 | Hard | Computed from Ca+Mg |
| Dennis Acres | 145.0 | 8.5 | Hard | Computed from Ca+Mg |
| Duquesne | 145.0 | 8.5 | Hard | Computed from Ca+Mg |
| Grand Falls Plaza | 145.0 | 8.5 | Hard | Computed from Ca+Mg |
| Leawood | 145.0 | 8.5 | Hard | Computed from Ca+Mg |
| Shoal Creek Drive | 145.0 | 8.5 | Hard | Computed from Ca+Mg |
| Blue Springs | 309.5 | 18.1 | Very hard | County estimate |
| Jefferson City | 218.1 | 12.8 | Very hard | Computed from Ca+Mg |
| St. Peters | 168.0 | 9.8 | Hard | Computed from Ca+Mg |
| Pevely | 307.5 | 18.0 | Very hard | Computed from Ca+Mg |
| Imperial | 212.0 | 12.4 | Very hard | County estimate |
| Cape Girardeau | 237.3 | 13.9 | Very hard | Computed from Ca+Mg |
| Barnhart | 212.0 | 12.4 | Very hard | County estimate |
| Liberty | 161.9 | 9.5 | Hard | Computed from Ca+Mg |
| Moberly | 135.2 | 7.9 | Hard | Computed from Ca+Mg |
| Fort Leonard Wood | 215.5 | 12.6 | Very hard | Computed from Ca+Mg |
| Murphy | 103.5 | 6.0 | Moderately hard | Computed from Ca+Mg |
| Poplar Bluff | 165.3 | 9.7 | Hard | Computed from Ca+Mg |
| Warrensburg | 232.7 | 13.6 | Very hard | Computed from Ca+Mg |
| Lebanon | 210.5 | 12.3 | Very hard | Computed from Ca+Mg |
| Kirkwood | 130.0 | 7.6 | Hard | Utility-reported |
| Raymore | 219.0 | 12.8 | Very hard | County estimate |
| Harrisburg | 123.6 | 7.2 | Hard | Utility-reported |
| Branson | 198.2 | 11.6 | Very hard | Computed from Ca+Mg |
| Washington | 210.0 | 12.3 | Very hard | Computed from Ca+Mg |
| Festus | 246.7 | 14.4 | Very hard | Computed from Ca+Mg |
| Fulton | 289.3 | 16.9 | Very hard | Computed from Ca+Mg |
| Ashland | 121.0 | 7.1 | Hard | Utility-reported |
| Kirksville | 132.9 | 7.8 | Hard | Computed from Ca+Mg |
| Grandview | 309.5 | 18.1 | Very hard | County estimate |
| Union | 188.3 | 11.0 | Very hard | Computed from Ca+Mg |
| High Ridge | 165.3 | 9.7 | Hard | Computed from Ca+Mg |
| Byrnes Mill | 165.0 | 9.7 | Hard | Computed from Ca+Mg |
| Hannibal | 209.3 | 12.2 | Very hard | Computed from Ca+Mg |
| New Bloomfield | 287.0 | 16.8 | Very hard | Computed from Ca+Mg |
| Oak Grove | 175.6 | 10.3 | Hard | Computed from Ca+Mg |
| Rolla | 271.9 | 15.9 | Very hard | Computed from Ca+Mg |
| Sedalia | 241.1 | 14.1 | Very hard | Computed from Ca+Mg |
| Ozark | 178.5 | 10.4 | Hard | Computed from Ca+Mg |
| Fremont Hills | 178.5 | 10.4 | Hard | Computed from Ca+Mg |
| Farmington | 276.5 | 16.2 | Very hard | Computed from Ca+Mg |
| Hartsburg | 87.8 | 5.1 | Moderately hard | Utility-reported |
| Pierpont | 87.8 | 5.1 | Moderately hard | Utility-reported |
| Rocheport | 87.8 | 5.1 | Moderately hard | Utility-reported |
| Pleasant Hill | 219.0 | 12.8 | Very hard | County estimate |
| Grain Valley | 309.5 | 18.1 | Very hard | County estimate |
| Moscow Mills | 246.9 | 14.4 | Very hard | Computed from Ca+Mg |
| Sikeston | 163.2 | 9.5 | Hard | Computed from Ca+Mg |
| Harrisonville | 120.7 | 7.1 | Hard | Computed from Ca+Mg |
| Parkville | 172.1 | 10.1 | Hard | Computed from Ca+Mg |
| Maryville | 112.0 | 6.5 | Moderately hard | Computed from Ca+Mg |
| Nevada | 157.4 | 9.2 | Hard | Computed from Ca+Mg |
| Macon | 73.3 | 4.3 | Moderately hard | Computed from Ca+Mg |
| Kearney | 135.3 | 7.9 | Hard | Computed from Ca+Mg |
| Carl Junction | 213.2 | 12.5 | Very hard | Computed from Ca+Mg |
| Parkdale | 103.5 | 6.0 | Moderately hard | Computed from Ca+Mg |
| Peaceful Village | 103.5 | 6.0 | Moderately hard | Computed from Ca+Mg |
| Bates City | 181.0 | 10.6 | Very hard | County estimate |
| Carthage | 165.2 | 9.7 | Hard | Computed from Ca+Mg |
| Marshall | 142.7 | 8.3 | Hard | Computed from Ca+Mg |
| Republic | 155.1 | 9.1 | Hard | Computed from Ca+Mg |
| Winfield | 239.3 | 14.0 | Very hard | Computed from Ca+Mg |
| Jackson | 267.8 | 15.7 | Very hard | Computed from Ca+Mg |
| Peculiar | 198.6 | 11.6 | Very hard | Computed from Ca+Mg |
| Excelsior Springs | 153.7 | 9.0 | Hard | Computed from Ca+Mg |
| Pacific | 197.2 | 11.5 | Very hard | Utility-reported |
| Whiteman AFB | 179.6 | 10.5 | Hard | Computed from Ca+Mg |
| Centerview | 261.5 | 15.3 | Very hard | Computed from Ca+Mg |
| Richmond | 189.6 | 11.1 | Very hard | Computed from Ca+Mg |
| Troy | 240.2 | 14.1 | Very hard | Computed from Ca+Mg |
| Conway | 219.5 | 12.8 | Very hard | Computed from Ca+Mg |
| Wardsville | 343.8 | 20.1 | Very hard | Computed from Ca+Mg |
| Kennett | 56.9 | 3.3 | Soft | Computed from Ca+Mg |
| Clinton | 146.5 | 8.6 | Hard | Computed from Ca+Mg |
| West Plains | 248.0 | 14.5 | Very hard | Computed from Ca+Mg |
| Auxvasse | 284.9 | 16.7 | Very hard | Computed from Ca+Mg |
| Lamar | 135.2 | 7.9 | Hard | Computed from Ca+Mg |
| Lamar Heights | 135.2 | 7.9 | Hard | Computed from Ca+Mg |
| Chain of Rocks | 239.3 | 14.0 | Very hard | Computed from Ca+Mg |
| Foley | 239.3 | 14.0 | Very hard | Computed from Ca+Mg |
| Fountain N' Lakes | 239.3 | 14.0 | Very hard | Computed from Ca+Mg |
| Old Monroe | 239.3 | 14.0 | Very hard | Computed from Ca+Mg |
| Holden | 225.4 | 13.2 | Very hard | Computed from Ca+Mg |
| Cameron | 143.1 | 8.4 | Hard | Computed from Ca+Mg |
| Mokane | 286.7 | 16.8 | Very hard | Computed from Ca+Mg |
| Kingdom City | 287.0 | 16.8 | Very hard | Computed from Ca+Mg |
| Smithville | 106.4 | 6.2 | Moderately hard | Computed from Ca+Mg |
| Henley | 343.8 | 20.1 | Very hard | Computed from Ca+Mg |
| La Plata | 288.0 | 16.8 | Very hard | County estimate |
| St. Clair | 161.9 | 9.5 | Hard | Utility-reported |
| St. Martins | 315.8 | 18.5 | Very hard | Computed from Ca+Mg |
| Webb City | 158.7 | 9.3 | Hard | Computed from Ca+Mg |
| Huntsville | 582.0 | 34.0 | Very hard | County estimate |
| Clarence | 211.5 | 12.4 | Very hard | County estimate |
| Bevier | 288.0 | 16.8 | Very hard | County estimate |
| Neosho | 168.3 | 9.8 | Hard | Computed from Ca+Mg |
| Portageville | 70.0 | 4.1 | Moderately hard | Computed from Ca+Mg |
| Atlanta | 288.0 | 16.8 | Very hard | County estimate |
| Callao | 288.0 | 16.8 | Very hard | County estimate |
| Plattsburg | 195.0 | 11.4 | Very hard | County estimate |
| Platte City | 287.4 | 16.8 | Very hard | Computed from Ca+Mg |
| Excelsior Estates | 198.4 | 11.6 | Very hard | Computed from Ca+Mg |
| Elmer | 288.0 | 16.8 | Very hard | County estimate |
| Kingsville | 261.5 | 15.3 | Very hard | Computed from Ca+Mg |
| Cairo | 582.0 | 34.0 | Very hard | County estimate |
| Jacksonville | 582.0 | 34.0 | Very hard | County estimate |
| Leonard | 211.5 | 12.4 | Very hard | County estimate |
| Chillicothe | 108.5 | 6.3 | Moderately hard | Computed from Ca+Mg |
| Horine | 307.5 | 18.0 | Very hard | Computed from Ca+Mg |
| Neelyville | 221.7 | 13.0 | Very hard | Computed from Ca+Mg |
| Higbee | 582.0 | 34.0 | Very hard | County estimate |
| Lexington | 181.0 | 10.6 | Very hard | County estimate |
| Chilhowee | 261.5 | 15.3 | Very hard | Computed from Ca+Mg |
| Osborn | 318.2 | 18.6 | Very hard | Computed from Ca+Mg |
| Aurora | 207.6 | 12.1 | Very hard | Computed from Ca+Mg |
| Prathersville | 153.7 | 9.0 | Hard | Computed from Ca+Mg |
| Savannah | 117.5 | 6.9 | Moderately hard | Computed from Ca+Mg |
| Eureka | 78.9 | 4.6 | Moderately hard | Utility-reported |
| Greentop | 198.5 | 11.6 | Very hard | County estimate |
| Clifton Hill | 582.0 | 34.0 | Very hard | County estimate |
| Glasgow | 588.0 | 34.4 | Very hard | County estimate |
| Renick | 582.0 | 34.0 | Very hard | County estimate |
| Salisbury | 133.0 | 7.8 | Hard | County estimate |
| Bowling Green | 146.2 | 8.6 | Hard | Computed from Ca+Mg |
| Jasper | 155.9 | 9.1 | Hard | Computed from Ca+Mg |
| Herculaneum | 345.5 | 20.2 | Very hard | Computed from Ca+Mg |
| Liberal | 158.3 | 9.3 | Hard | Computed from Ca+Mg |
| Orrick | 198.4 | 11.6 | Very hard | Computed from Ca+Mg |
| Wood Heights | 198.4 | 11.6 | Very hard | Computed from Ca+Mg |
| Louisiana | 177.7 | 10.4 | Hard | Computed from Ca+Mg |
| Kimmswick | 212.0 | 12.4 | Very hard | County estimate |
| Holts Summit | 284.4 | 16.6 | Very hard | Computed from Ca+Mg |
| Freeman | 198.6 | 11.6 | Very hard | Computed from Ca+Mg |
| Henrietta | 198.4 | 11.6 | Very hard | Computed from Ca+Mg |
| Hayti | 22.8 | 1.3 | Soft | Computed from Ca+Mg |
| Carytown | 154.8 | 9.1 | Hard | Computed from Ca+Mg |
| Golden City | 154.8 | 9.1 | Hard | Computed from Ca+Mg |
| Jerico Springs | 154.8 | 9.1 | Hard | Computed from Ca+Mg |
| Lockwood | 154.8 | 9.1 | Hard | Computed from Ca+Mg |
| Milford | 154.8 | 9.1 | Hard | Computed from Ca+Mg |
| Mindenmines | 154.8 | 9.1 | Hard | Computed from Ca+Mg |
| Canton | 113.4 | 6.6 | Moderately hard | Utility-reported |
| Longtown | 283.1 | 16.6 | Very hard | Computed from Ca+Mg |
| Oak Ridge | 283.1 | 16.6 | Very hard | Computed from Ca+Mg |
| Old Appleton | 283.1 | 16.6 | Very hard | Computed from Ca+Mg |
| Pocahontas | 283.1 | 16.6 | Very hard | Computed from Ca+Mg |
| Kahoka | 141.8 | 8.3 | Hard | Utility-reported |
| Camden | 198.4 | 11.6 | Very hard | Computed from Ca+Mg |
| Crystal Lakes | 198.4 | 11.6 | Very hard | Computed from Ca+Mg |
| Fleming | 198.4 | 11.6 | Very hard | Computed from Ca+Mg |
| Homestead | 198.4 | 11.6 | Very hard | Computed from Ca+Mg |
| Walker | 212.5 | 12.4 | Very hard | Computed from Ca+Mg |
| Vandalia | 141.5 | 8.3 | Hard | Computed from Ca+Mg |
| Schell City | 211.0 | 12.3 | Very hard | Computed from Ca+Mg |
| Bronaugh | 206.2 | 12.1 | Very hard | Computed from Ca+Mg |
| Battlefield | 190.1 | 11.1 | Very hard | Computed from Ca+Mg |
| Monett | 180.1 | 10.5 | Very hard | Computed from Ca+Mg |
| Hollister | 273.6 | 16.0 | Very hard | Computed from Ca+Mg |
| Harwood | 211.0 | 12.3 | Very hard | Computed from Ca+Mg |
| Moundville | 211.0 | 12.3 | Very hard | Computed from Ca+Mg |
| Richards | 211.0 | 12.3 | Very hard | Computed from Ca+Mg |
| Stotesbury | 211.0 | 12.3 | Very hard | Computed from Ca+Mg |
| Lone Jack | 309.5 | 18.1 | Very hard | County estimate |
| Steele | 21.9 | 1.3 | Soft | Computed from Ca+Mg |
| Park Hills | 564.6 | 33.0 | Very hard | Computed from Ca+Mg |
| Centralia | 228.5 | 13.4 | Very hard | Computed from Ca+Mg |
| Malden | 35.0 | 2.0 | Soft | Computed from Ca+Mg |
| Leadington | 567.4 | 33.2 | Very hard | Computed from Ca+Mg |
| Palmyra | 142.8 | 8.3 | Hard | Computed from Ca+Mg |
| Charleston | 99.9 | 5.8 | Moderately hard | Computed from Ca+Mg |
| Willard | 152.7 | 8.9 | Hard | Computed from Ca+Mg |
| Villa Ridge | 135.6 | 7.9 | Hard | Utility-reported |
| Greenwood | 309.5 | 18.1 | Very hard | County estimate |
| Gray Summit | 135.0 | 7.9 | Hard | Utility-reported |
| Napoleon | 181.0 | 10.6 | Very hard | County estimate |
| Odessa | 181.0 | 10.6 | Very hard | County estimate |
| La Grange | 137.4 | 8.0 | Hard | Utility-reported |
| Novinger | 198.5 | 11.6 | Very hard | County estimate |
| Emma | 231.0 | 13.5 | Very hard | County estimate |
| Sweet Springs | 231.0 | 13.5 | Very hard | County estimate |
| De Soto | 312.3 | 18.3 | Very hard | Computed from Ca+Mg |
| Olympian Village | 312.3 | 18.3 | Very hard | Computed from Ca+Mg |
| Wellsville | 216.5 | 12.7 | Very hard | County estimate |
| Hallsville | 308.8 | 18.1 | Very hard | Computed from Ca+Mg |
| Waverly | 181.0 | 10.6 | Very hard | County estimate |
| Edgerton | 198.0 | 11.6 | Very hard | County estimate |
| Oronogo | 317.0 | 18.5 | Very hard | Computed from Ca+Mg |
| Crystal City | 269.8 | 15.8 | Very hard | Computed from Ca+Mg |
| Union Star | 96.9 | 5.7 | Moderately hard | County estimate |
| Wayland | 122.0 | 7.1 | Hard | Utility-reported |
| Taos | 291.9 | 17.1 | Very hard | Computed from Ca+Mg |
| Easton | 278.5 | 16.3 | Very hard | County estimate |
| Clarksdale | 193.5 | 11.3 | Very hard | County estimate |
| Brashear | 198.5 | 11.6 | Very hard | County estimate |
| Gibbs | 198.5 | 11.6 | Very hard | County estimate |
| House Springs | 300.8 | 17.6 | Very hard | Computed from Ca+Mg |
| LaBarque Creek | 300.8 | 17.6 | Very hard | Computed from Ca+Mg |
| Scotsdale | 300.8 | 17.6 | Very hard | Computed from Ca+Mg |
| New London | 171.0 | 10.0 | Hard | County estimate |
| Wyaconda | 122.0 | 7.1 | Hard | Utility-reported |
| Lathrop | 195.0 | 11.4 | Very hard | County estimate |
| Amity | 193.5 | 11.3 | Very hard | County estimate |
| Gower | 195.0 | 11.4 | Very hard | County estimate |
| Maysville | 193.5 | 11.3 | Very hard | County estimate |
| Stewartsville | 195.0 | 11.4 | Very hard | County estimate |
| Miner | 108.6 | 6.3 | Moderately hard | Computed from Ca+Mg |
| Malta Bend | 231.0 | 13.5 | Very hard | County estimate |
| Wardell | 20.9 | 1.2 | Soft | Computed from Ca+Mg |
| Laddonia | 152.8 | 8.9 | Hard | Computed from Ca+Mg |
| Perry | 171.0 | 10.0 | Hard | County estimate |
| Alexandria | 122.0 | 7.1 | Hard | Utility-reported |
| Luray | 122.0 | 7.1 | Hard | Utility-reported |
| Revere | 122.0 | 7.1 | Hard | Utility-reported |
| Williamstown | 122.0 | 7.1 | Hard | Utility-reported |
| Farber | 139.5 | 8.2 | Hard | County estimate |
| Clarksville | 207.3 | 12.1 | Very hard | Computed from Ca+Mg |
| Bethany | 164.4 | 9.6 | Hard | Computed from Ca+Mg |
| Alma | 181.0 | 10.6 | Very hard | County estimate |
| Blackburn | 231.0 | 13.5 | Very hard | County estimate |
| Concordia | 181.0 | 10.6 | Very hard | County estimate |
| Corder | 181.0 | 10.6 | Very hard | County estimate |
| Dover | 181.0 | 10.6 | Very hard | County estimate |
| Higginsville | 181.0 | 10.6 | Very hard | County estimate |
| Mayview | 181.0 | 10.6 | Very hard | County estimate |
| Buckner | 309.5 | 18.1 | Very hard | County estimate |
| Frankford | 202.0 | 11.8 | Very hard | County estimate |
| Hopkins | 228.4 | 13.4 | Very hard | Computed from Ca+Mg |
| Burlington Junction | 277.9 | 16.3 | Very hard | Computed from Ca+Mg |
| Curryville | 202.0 | 11.8 | Very hard | County estimate |
| Farley | 198.0 | 11.6 | Very hard | County estimate |
| Ravenwood | 223.5 | 13.1 | Very hard | Computed from Ca+Mg |
| Middletown | 130.2 | 7.6 | Hard | Computed from Ca+Mg |
| Bragg City | 21.3 | 1.3 | Soft | Computed from Ca+Mg |
| Caruthersville | 21.3 | 1.3 | Soft | Computed from Ca+Mg |
| Cooter | 21.3 | 1.3 | Soft | Computed from Ca+Mg |
| Hayti Heights | 21.3 | 1.3 | Soft | Computed from Ca+Mg |
| Holland | 21.3 | 1.3 | Soft | Computed from Ca+Mg |
| Homestown | 21.3 | 1.3 | Soft | Computed from Ca+Mg |
| Pascola | 21.3 | 1.3 | Soft | Computed from Ca+Mg |
| Rives | 21.3 | 1.3 | Soft | Computed from Ca+Mg |
| Montgomery City | 216.5 | 12.7 | Very hard | County estimate |
| Rush Hill | 139.5 | 8.2 | Hard | County estimate |
| Barnard | 200.0 | 11.7 | Very hard | County estimate |
| Skidmore | 200.0 | 11.7 | Very hard | County estimate |
| Conception Junction | 255.2 | 14.9 | Very hard | Computed from Ca+Mg |
| Annada | 202.0 | 11.8 | Very hard | County estimate |
| Ashburn | 202.0 | 11.8 | Very hard | County estimate |
| Eolia | 202.0 | 11.8 | Very hard | County estimate |
| Graham | 217.2 | 12.7 | Very hard | Computed from Ca+Mg |
| Gilman City | 216.2 | 12.6 | Very hard | Computed from Ca+Mg |
| Forsyth | 282.2 | 16.5 | Very hard | Computed from Ca+Mg |
| Center | 171.0 | 10.0 | Hard | County estimate |
| Monroe City | 168.0 | 9.8 | Hard | County estimate |
| Clearmont | 200.0 | 11.7 | Very hard | County estimate |
| Clyde | 200.0 | 11.7 | Very hard | County estimate |
| Elmo | 200.0 | 11.7 | Very hard | County estimate |
| Guilford | 200.0 | 11.7 | Very hard | County estimate |
| Parnell | 200.0 | 11.7 | Very hard | County estimate |
| Pickering | 200.0 | 11.7 | Very hard | County estimate |
| Campbell | 30.3 | 1.8 | Soft | Computed from Ca+Mg |
| Milan | 179.0 | 10.5 | Hard | County estimate |
| Carrollton | 103.5 | 6.0 | Moderately hard | Computed from Ca+Mg |
| East Prairie | 104.1 | 6.1 | Moderately hard | Computed from Ca+Mg |
| Mapaville | 345.5 | 20.2 | Very hard | Computed from Ca+Mg |
| Evergreen | 205.5 | 12.0 | Very hard | Computed from Ca+Mg |
| Phillipsburg | 205.5 | 12.0 | Very hard | Computed from Ca+Mg |
| Bull Creek | 233.8 | 13.7 | Very hard | Computed from Ca+Mg |
| Merriam Woods | 233.8 | 13.7 | Very hard | Computed from Ca+Mg |
| Rockaway Beach | 233.8 | 13.7 | Very hard | Computed from Ca+Mg |
| Saddlebrooke | 233.8 | 13.7 | Very hard | Computed from Ca+Mg |
| Brookfield | 119.5 | 7.0 | Moderately hard | County estimate |
| Bucklin | 119.5 | 7.0 | Moderately hard | County estimate |
| Ethel | 288.0 | 16.8 | Very hard | County estimate |
| Marceline | 133.0 | 7.8 | Hard | County estimate |
| Mendon | 133.0 | 7.8 | Hard | County estimate |
| New Cambria | 288.0 | 16.8 | Very hard | County estimate |
| Rothville | 133.0 | 7.8 | Hard | County estimate |
| Sumner | 133.0 | 7.8 | Hard | County estimate |
| Amazonia | 96.9 | 5.7 | Moderately hard | County estimate |
| East Lynne | 219.0 | 12.8 | Very hard | County estimate |
| Airport Drive | 132.3 | 7.7 | Hard | Computed from Ca+Mg |
| Windsor | 313.3 | 18.3 | Very hard | Computed from Ca+Mg |
| Sturgeon | 290.1 | 17.0 | Very hard | Computed from Ca+Mg |
| Clarkton | 32.0 | 1.9 | Soft | Computed from Ca+Mg |
| Licking | 220.9 | 12.9 | Very hard | Computed from Ca+Mg |
| Unionville | 134.0 | 7.8 | Hard | Utility-reported |
| Leeton | 219.5 | 12.8 | Very hard | Computed from Ca+Mg |
| El Dorado Springs | 182.2 | 10.7 | Very hard | Computed from Ca+Mg |
| Memphis | 99.3 | 5.8 | Moderately hard | Computed from Ca+Mg |
| Edina | 178.0 | 10.4 | Hard | County estimate |
| Cassville | 147.2 | 8.6 | Hard | Computed from Ca+Mg |
| Desloge | 321.4 | 18.8 | Very hard | Computed from Ca+Mg |
| Hermann | 147.5 | 8.6 | Hard | County estimate |
| New Haven | 154.0 | 9.0 | Hard | County estimate |
| Green City | 179.0 | 10.5 | Hard | County estimate |
| Clark | 290.1 | 17.0 | Very hard | Computed from Ca+Mg |
| Lawson | 250.5 | 14.7 | Very hard | County estimate |
| Philadelphia | 168.0 | 9.8 | Hard | County estimate |
| Senath | 4.8 | 0.3 | Soft | Computed from Ca+Mg |
| Green Castle | 198.5 | 11.6 | Very hard | County estimate |
| Mount Vernon | 180.9 | 10.6 | Very hard | Computed from Ca+Mg |
| Scott City | 305.8 | 17.9 | Very hard | Computed from Ca+Mg |
| Lewistown | 198.0 | 11.6 | Very hard | County estimate |
| Newtown | 179.0 | 10.5 | Hard | County estimate |
| Kirbyville | 267.7 | 15.7 | Very hard | Computed from Ca+Mg |
| Laquey | 264.6 | 15.5 | Very hard | Computed from Ca+Mg |
| Powersite | 267.7 | 15.7 | Very hard | Computed from Ca+Mg |
| Richland | 264.6 | 15.5 | Very hard | Computed from Ca+Mg |
| Waynesville | 264.6 | 15.5 | Very hard | Computed from Ca+Mg |
| St James | 377.4 | 22.1 | Very hard | Computed from Ca+Mg |
| Browning | 179.0 | 10.5 | Hard | County estimate |
| Harris | 179.0 | 10.5 | Hard | County estimate |
| Humphreys | 179.0 | 10.5 | Hard | County estimate |
| Pollock | 179.0 | 10.5 | Hard | County estimate |
| Sibley | 309.5 | 18.1 | Very hard | County estimate |
| Houston | 234.9 | 13.7 | Very hard | Computed from Ca+Mg |
| Lancaster | 117.5 | 6.9 | Moderately hard | County estimate |
| Ridgeway | 216.2 | 12.6 | Very hard | Computed from Ca+Mg |
| New Madrid | 211.3 | 12.4 | Very hard | Computed from Ca+Mg |
| Cleveland | 198.6 | 11.6 | Very hard | Computed from Ca+Mg |
| Lake Annette | 198.6 | 11.6 | Very hard | Computed from Ca+Mg |
| West Line | 198.6 | 11.6 | Very hard | Computed from Ca+Mg |
| New Hampton | 216.2 | 12.6 | Very hard | Computed from Ca+Mg |
| Benton | 137.2 | 8.0 | Hard | Computed from Ca+Mg |
| Lambert | 137.2 | 8.0 | Hard | Computed from Ca+Mg |
| Knob Noster | 255.3 | 14.9 | Very hard | Computed from Ca+Mg |
| Spickard | 165.0 | 9.7 | Hard | County estimate |
| Baring | 178.0 | 10.4 | Hard | County estimate |
| Hurdland | 178.0 | 10.4 | Hard | County estimate |
| Knox City | 178.0 | 10.4 | Hard | County estimate |
| La Belle | 198.0 | 11.6 | Very hard | County estimate |
| Novelty | 178.0 | 10.4 | Hard | County estimate |
| Bonne Terre | 338.6 | 19.8 | Very hard | Computed from Ca+Mg |
| Willow Springs | 195.7 | 11.4 | Very hard | Computed from Ca+Mg |
| Downing | 117.5 | 6.9 | Moderately hard | County estimate |
| Purcell | 384.8 | 22.5 | Very hard | Computed from Ca+Mg |
| Cardwell | 5.2 | 0.3 | Soft | Computed from Ca+Mg |
| Hornersville | 5.2 | 0.3 | Soft | Computed from Ca+Mg |
| Bertrand | 149.9 | 8.8 | Hard | Computed from Ca+Mg |
| Mount Moriah | 216.2 | 12.6 | Very hard | Computed from Ca+Mg |
| Galt | 165.0 | 9.7 | Hard | County estimate |
| Laredo | 165.0 | 9.7 | Hard | County estimate |
| Trenton | 165.0 | 9.7 | Hard | County estimate |
| Glenwood | 117.5 | 6.9 | Moderately hard | County estimate |
| Cosby | 96.9 | 5.7 | Moderately hard | County estimate |
| Arbyrd | 5.4 | 0.3 | Soft | Computed from Ca+Mg |
| Mercer | 202.0 | 11.8 | Very hard | County estimate |
| Queen City | 117.5 | 6.9 | Moderately hard | County estimate |
| Alba | 384.8 | 22.5 | Very hard | Computed from Ca+Mg |
| Asbury | 384.8 | 22.5 | Very hard | Computed from Ca+Mg |
| Waco | 384.8 | 22.5 | Very hard | Computed from Ca+Mg |
| Des Peres | 263.3 | 15.4 | Very hard | Computed from Ca+Mg |
| Holt | 95.1 | 5.6 | Moderately hard | Computed from Ca+Mg |
| Duenweg | 152.5 | 8.9 | Hard | Computed from Ca+Mg |
| Blodgett | 100.1 | 5.8 | Moderately hard | Computed from Ca+Mg |
| Wyatt | 268.8 | 15.7 | Very hard | Computed from Ca+Mg |
| Rutledge | 178.0 | 10.4 | Hard | County estimate |
| Cuba | 244.6 | 14.3 | Very hard | Computed from Ca+Mg |
| Bosworth | 114.2 | 6.7 | Moderately hard | Computed from Ca+Mg |
| Archie | 219.0 | 12.8 | Very hard | County estimate |
| Tipton | 203.0 | 11.9 | Very hard | County estimate |
| Bogard | 105.3 | 6.2 | Moderately hard | Computed from Ca+Mg |
| Terre du Lac | 292.6 | 17.1 | Very hard | Computed from Ca+Mg |
| Anniston | 156.0 | 9.1 | Hard | County estimate |
| Commerce | 97.2 | 5.7 | Moderately hard | Computed from Ca+Mg |
| Diehlstadt | 97.2 | 5.7 | Moderately hard | Computed from Ca+Mg |
| Tina | 105.3 | 6.2 | Moderately hard | Computed from Ca+Mg |
| Nixa | 231.4 | 13.5 | Very hard | Computed from Ca+Mg |
| Buffalo | 222.6 | 13.0 | Very hard | Computed from Ca+Mg |
| Calhoun | 309.0 | 18.1 | Very hard | County estimate |
| Plato | 256.0 | 15.0 | Very hard | Computed from Ca+Mg |
| Roby | 256.0 | 15.0 | Very hard | Computed from Ca+Mg |
| Ava | 198.5 | 11.6 | Very hard | County estimate |
| Chaffee | 376.6 | 22.0 | Very hard | Computed from Ca+Mg |
| Hillsboro | 296.2 | 17.3 | Very hard | Computed from Ca+Mg |
| Livonia | 128.0 | 7.5 | Hard | Utility-reported |
| Lucerne | 128.0 | 7.5 | Hard | Utility-reported |
| Powersville | 128.0 | 7.5 | Hard | Utility-reported |
| Worthington | 128.0 | 7.5 | Hard | Utility-reported |
| De Witt | 105.3 | 6.2 | Moderately hard | Computed from Ca+Mg |
| Gideon | 36.3 | 2.1 | Soft | Computed from Ca+Mg |
| Bethel | 211.5 | 12.4 | Very hard | County estimate |
| Shelbina | 211.5 | 12.4 | Very hard | County estimate |
| Shelbyville | 211.5 | 12.4 | Very hard | County estimate |
| Deepwater | 154.6 | 9.0 | Hard | Computed from Ca+Mg |
| Miami | 231.0 | 13.5 | Very hard | County estimate |
| Fayette | 588.0 | 34.4 | Very hard | County estimate |
| Owensville | 147.5 | 8.6 | Hard | County estimate |
| Mountain View | 223.1 | 13.1 | Very hard | Computed from Ca+Mg |
| Mt View | 223.1 | 13.1 | Very hard | Computed from Ca+Mg |
| Marthasville | 302.1 | 17.7 | Very hard | Computed from Ca+Mg |
| Parma | 62.9 | 3.7 | Moderately hard | Computed from Ca+Mg |
| Slater | 76.6 | 4.5 | Moderately hard | Computed from Ca+Mg |
| Bernie | 150.1 | 8.8 | Hard | Computed from Ca+Mg |
| Marston | 71.8 | 4.2 | Moderately hard | Computed from Ca+Mg |
| Adrian | 180.5 | 10.6 | Very hard | County estimate |
| Nelson | 231.0 | 13.5 | Very hard | County estimate |
| Doniphan | 161.8 | 9.5 | Hard | Computed from Ca+Mg |
| Fairdealing | 161.8 | 9.5 | Hard | Computed from Ca+Mg |
| Potosi | 245.5 | 14.4 | Very hard | County estimate |
| Piedmont | 114.0 | 6.7 | Moderately hard | County estimate |
| Broseley | 198.9 | 11.6 | Very hard | Computed from Ca+Mg |
| Strafford | 222.0 | 13.0 | Very hard | County estimate |
| Weston | 198.0 | 11.6 | Very hard | County estimate |
| Orongo | 225.3 | 13.2 | Very hard | Computed from Ca+Mg |
| Versailles | 170.5 | 10.0 | Hard | County estimate |
| Risco | 49.0 | 2.9 | Soft | Computed from Ca+Mg |
| Breckenridge | 252.0 | 14.7 | Very hard | County estimate |
| Gallatin | 219.0 | 12.8 | Very hard | County estimate |
| Jameson | 219.0 | 12.8 | Very hard | County estimate |
| Jamesport | 219.0 | 12.8 | Very hard | County estimate |
| Millersville | 210.9 | 12.3 | Very hard | Computed from Ca+Mg |
| Seneca | 163.0 | 9.5 | Hard | County estimate |
| Appleton City | 154.6 | 9.0 | Hard | Computed from Ca+Mg |
| Brownington | 154.6 | 9.0 | Hard | Computed from Ca+Mg |
| La Due | 154.6 | 9.0 | Hard | Computed from Ca+Mg |
| Lowry City | 154.6 | 9.0 | Hard | Computed from Ca+Mg |
| Montrose | 154.6 | 9.0 | Hard | Computed from Ca+Mg |
| Sheldon | 175.2 | 10.3 | Hard | Computed from Ca+Mg |
| Chula | 127.8 | 7.5 | Hard | Computed from Ca+Mg |
| Washburn | 153.5 | 9.0 | Hard | Computed from Ca+Mg |
| Thayer | 208.0 | 12.2 | Very hard | County estimate |
| Warsaw | 229.0 | 13.4 | Very hard | County estimate |
| Marionville | 172.6 | 10.1 | Hard | Computed from Ca+Mg |
| Trimble | 195.0 | 11.4 | Very hard | County estimate |
| Catron | 40.4 | 2.4 | Soft | Computed from Ca+Mg |
| Tallapoosa | 40.4 | 2.4 | Soft | Computed from Ca+Mg |
| Amoret | 180.5 | 10.6 | Very hard | County estimate |
| Foster | 180.5 | 10.6 | Very hard | County estimate |
| Hume | 112.0 | 6.5 | Moderately hard | County estimate |
| Metz | 112.0 | 6.5 | Moderately hard | County estimate |
| Rich Hill | 180.5 | 10.6 | Very hard | County estimate |
| Cabool | 186.0 | 10.9 | Very hard | County estimate |
| Clever | 142.2 | 8.3 | Hard | Computed from Ca+Mg |
| Elsberry | 204.0 | 11.9 | Very hard | Computed from Ca+Mg |
| Altamont | 219.0 | 12.8 | Very hard | County estimate |
| Pattonsburg | 219.0 | 12.8 | Very hard | County estimate |
| Weatherby | 193.5 | 11.3 | Very hard | County estimate |
| Winston | 219.0 | 12.8 | Very hard | County estimate |
| Franklin | 588.0 | 34.4 | Very hard | County estimate |
| Hale | 231.6 | 13.5 | Very hard | County estimate |
| Kimberling City | 178.0 | 10.4 | Hard | County estimate |
| Rushville | 278.5 | 16.3 | Very hard | County estimate |
| Granby | 152.4 | 8.9 | Hard | Computed from Ca+Mg |
| Leadwood | 486.1 | 28.4 | Very hard | Computed from Ca+Mg |
| Osage Beach | 227.0 | 13.3 | Very hard | County estimate |
| Kissee Mills | 314.8 | 18.4 | Very hard | Computed from Ca+Mg |
| Taneyville | 314.8 | 18.4 | Very hard | Computed from Ca+Mg |
| Carterville | 199.2 | 11.7 | Very hard | Computed from Ca+Mg |
| Polo | 252.0 | 14.7 | Very hard | County estimate |
| Anderson | 100.2 | 5.9 | Moderately hard | Computed from Ca+Mg |
| Creighton | 219.0 | 12.8 | Very hard | County estimate |
| Garden City | 219.0 | 12.8 | Very hard | County estimate |
| Sparta | 184.0 | 10.8 | Very hard | County estimate |
| Seymour | 205.0 | 12.0 | Very hard | County estimate |
| Bloomfield | 113.0 | 6.6 | Moderately hard | County estimate |
| Stockton | 129.0 | 7.5 | Hard | County estimate |
| Milo | 176.0 | 10.3 | Hard | Computed from Ca+Mg |
| Indian Lake | 246.7 | 14.4 | Very hard | Computed from Ca+Mg |
| Foristell | 299.0 | 17.5 | Very hard | Computed from Ca+Mg |
| Cobalt | 156.8 | 9.2 | Hard | Computed from Ca+Mg |
| Fredericktown | 156.8 | 9.2 | Hard | Computed from Ca+Mg |
| Junction City | 156.8 | 9.2 | Hard | Computed from Ca+Mg |
| Marquand | 156.8 | 9.2 | Hard | Computed from Ca+Mg |
| Fordland | 198.9 | 11.6 | Very hard | Computed from Ca+Mg |
| Point Lookout | 117.1 | 6.8 | Moderately hard | Computed from Ca+Mg |
| Ewing | 198.0 | 11.6 | Very hard | County estimate |
| Monticello | 198.0 | 11.6 | Very hard | County estimate |
| Steelville | 202.5 | 11.8 | Very hard | Computed from Ca+Mg |
| El Dorando Springs | 178.3 | 10.4 | Hard | Computed from Ca+Mg |
| Wheeling | 119.0 | 7.0 | Moderately hard | County estimate |
| Dexter | 113.0 | 6.6 | Moderately hard | County estimate |
| Purdin | 119.5 | 7.0 | Moderately hard | County estimate |
| Gordonville | 234.7 | 13.7 | Very hard | Computed from Ca+Mg |
| Lilbourn | 176.8 | 10.3 | Hard | Computed from Ca+Mg |
| Bourbon | 176.7 | 10.3 | Hard | Computed from Ca+Mg |
| Belle | 175.0 | 10.2 | Hard | County estimate |
| Fair Grove | 215.2 | 12.6 | Very hard | Computed from Ca+Mg |
| Branson West | 285.5 | 16.7 | Very hard | Computed from Ca+Mg |
| Dearborn | 198.0 | 11.6 | Very hard | County estimate |
| Lock Springs | 219.0 | 12.8 | Very hard | County estimate |
| Linn | 180.0 | 10.5 | Hard | County estimate |
| Qulin | 74.4 | 4.3 | Moderately hard | Computed from Ca+Mg |
| Rocky Comfort | 130.7 | 7.6 | Hard | Computed from Ca+Mg |
| Town and Country | 233.5 | 13.7 | Very hard | Computed from Ca+Mg |
| Crane | 178.7 | 10.4 | Hard | Computed from Ca+Mg |
| Tarkio | 188.0 | 11.0 | Very hard | County estimate |
| Lampe | 178.0 | 10.4 | Hard | County estimate |
| Ash Grove | 222.0 | 13.0 | Very hard | County estimate |
| Bismarck | 316.0 | 18.5 | Very hard | County estimate |
| Worth | 215.0 | 12.6 | Very hard | County estimate |
| Benton City | 105.0 | 6.1 | Moderately hard | County estimate |
| Mexico | 139.5 | 8.2 | Hard | County estimate |
| Braymer | 252.0 | 14.7 | Very hard | County estimate |
| Hamilton | 252.0 | 14.7 | Very hard | County estimate |
| Kingston | 252.0 | 14.7 | Very hard | County estimate |
| Mansfield | 234.4 | 13.7 | Very hard | Computed from Ca+Mg |
| Highlandville | 231.4 | 13.5 | Very hard | Computed from Ca+Mg |
| Advance | 113.0 | 6.6 | Moderately hard | County estimate |
| Greenfield | 173.0 | 10.1 | Hard | County estimate |
| Gerald | 154.0 | 9.0 | Hard | County estimate |
| Raymondville | 221.8 | 13.0 | Very hard | Computed from Ca+Mg |
| Sarcoxie | 208.0 | 12.2 | Very hard | County estimate |
| Meadville | 119.5 | 7.0 | Moderately hard | County estimate |
| Drexel | 219.0 | 12.8 | Very hard | County estimate |
| Winona | 177.5 | 10.4 | Hard | County estimate |
| Dawn | 119.0 | 7.0 | Moderately hard | County estimate |
| Ludlow | 119.0 | 7.0 | Moderately hard | County estimate |
| Mooresville | 119.0 | 7.0 | Moderately hard | County estimate |
| Utica | 119.0 | 7.0 | Moderately hard | County estimate |
| Macks Creek | 227.0 | 13.3 | Very hard | County estimate |
| Oran | 269.8 | 15.8 | Very hard | Computed from Ca+Mg |
| Reeds Spring | 178.0 | 10.4 | Hard | County estimate |
| Blairstown | 108.1 | 6.3 | Moderately hard | Computed from Ca+Mg |
| Goodman | 118.5 | 6.9 | Moderately hard | Computed from Ca+Mg |
| Mound City | 197.0 | 11.5 | Very hard | County estimate |
| Missouri City | 509.0 | 29.8 | Very hard | County estimate |
| Loose Creek | 286.9 | 16.8 | Very hard | Computed from Ca+Mg |
| St. Paul | 281.2 | 16.4 | Very hard | Computed from Ca+Mg |
| Warrenton | 307.2 | 18.0 | Very hard | Computed from Ca+Mg |
| Pierce City | 187.5 | 11.0 | Very hard | County estimate |
| Innsbrook | 305.7 | 17.9 | Very hard | Computed from Ca+Mg |
| Truesdale | 305.7 | 17.9 | Very hard | Computed from Ca+Mg |
| Wright City | 305.7 | 17.9 | Very hard | Computed from Ca+Mg |
| Princeton | 74.2 | 4.3 | Moderately hard | Computed from Ca+Mg |
| Cole Camp | 229.0 | 13.4 | Very hard | County estimate |
| Urich | 309.0 | 18.1 | Very hard | County estimate |
| La Monte | 346.9 | 20.3 | Very hard | Computed from Ca+Mg |
| Fillmore | 96.9 | 5.7 | Moderately hard | County estimate |
| Lagrange | 236.9 | 13.8 | Very hard | Computed from Ca+Mg |
| Lincoln | 229.0 | 13.4 | Very hard | County estimate |
| Purdy | 182.9 | 10.7 | Very hard | Computed from Ca+Mg |
| Stover | 170.5 | 10.0 | Hard | County estimate |
| Crocker | 369.1 | 21.6 | Very hard | Computed from Ca+Mg |
| Dixon | 369.1 | 21.6 | Very hard | Computed from Ca+Mg |
| Craig | 197.0 | 11.5 | Very hard | County estimate |
| Oregon | 197.0 | 11.5 | Very hard | County estimate |
| Brunswick | 133.0 | 7.8 | Hard | County estimate |
| Humansville | 208.0 | 12.2 | Very hard | County estimate |
| Billings | 184.0 | 10.8 | Very hard | County estimate |
| Maplewood | 144.0 | 8.4 | Hard | Utility-reported |
| Alton | 208.0 | 12.2 | Very hard | County estimate |
| Houstonia | 190.0 | 11.1 | Very hard | County estimate |
| Sullivan | 188.3 | 11.0 | Very hard | Computed from Ca+Mg |
| Diamond | 189.7 | 11.1 | Very hard | Computed from Ca+Mg |
| Morehouse | 225.8 | 13.2 | Very hard | Computed from Ca+Mg |
| Seligman | 173.7 | 10.2 | Hard | Computed from Ca+Mg |
| Selligman | 173.7 | 10.2 | Hard | Computed from Ca+Mg |
| Arrow Rock | 231.0 | 13.5 | Very hard | County estimate |
| Gilliam | 231.0 | 13.5 | Very hard | County estimate |
| Pomona | 197.7 | 11.6 | Very hard | Computed from Ca+Mg |
| Doe Run | 316.0 | 18.5 | Very hard | County estimate |
| Ironton | 241.5 | 14.1 | Very hard | County estimate |
| Pilot Knob | 241.5 | 14.1 | Very hard | County estimate |
| Blythedale | 208.0 | 12.2 | Very hard | County estimate |
| Eagleville | 208.0 | 12.2 | Very hard | County estimate |
| Wellington | 181.0 | 10.6 | Very hard | County estimate |
| Edgar Springs | 192.2 | 11.2 | Very hard | Computed from Ca+Mg |
| Exeter | 198.8 | 11.6 | Very hard | Computed from Ca+Mg |
| Turney | 195.0 | 11.4 | Very hard | County estimate |
| Norborne | 213.2 | 12.5 | Very hard | Computed from Ca+Mg |
| Westphalia | 332.8 | 19.5 | Very hard | Computed from Ca+Mg |
| Kelso | 270.2 | 15.8 | Very hard | Computed from Ca+Mg |
| Wheaton | 201.2 | 11.8 | Very hard | Computed from Ca+Mg |
| Morley | 192.7 | 11.3 | Very hard | Computed from Ca+Mg |
| Canalou | 133.0 | 7.8 | Hard | County estimate |
| Kidder | 252.0 | 14.7 | Very hard | County estimate |
| Rockville | 526.0 | 30.8 | Very hard | County estimate |
| Norwood | 222.3 | 13.0 | Very hard | Computed from Ca+Mg |
| Hartville | 194.2 | 11.4 | Very hard | Computed from Ca+Mg |
| Strasburg | 219.0 | 12.8 | Very hard | County estimate |
| Holcomb | 18.8 | 1.1 | Soft | Computed from Ca+Mg |
| Matthews | 104.9 | 6.1 | Moderately hard | Computed from Ca+Mg |
| Pleasant Hope | 172.5 | 10.1 | Hard | Computed from Ca+Mg |
| Bolckow | 96.9 | 5.7 | Moderately hard | County estimate |
| Rea | 96.9 | 5.7 | Moderately hard | County estimate |
| Rosendale | 96.9 | 5.7 | Moderately hard | County estimate |
| Hardin | 250.5 | 14.7 | Very hard | County estimate |
| Deerfield | 112.0 | 6.5 | Moderately hard | County estimate |
| Burlington Juntion | 277.9 | 16.3 | Very hard | Computed from Ca+Mg |
| Camden Point | 198.0 | 11.6 | Very hard | County estimate |
| Essex | 113.0 | 6.6 | Moderately hard | County estimate |
| West Sullivan | 201.4 | 11.8 | Very hard | Computed from Ca+Mg |
| Bois D Arc | 160.7 | 9.4 | Hard | Computed from Ca+Mg |
| Smithton | 320.1 | 18.7 | Very hard | Computed from Ca+Mg |
| Butterfield | 140.3 | 8.2 | Hard | Computed from Ca+Mg |
| Green Ridge | 273.7 | 16.0 | Very hard | Computed from Ca+Mg |
| Newtonia | 121.0 | 7.1 | Hard | Computed from Ca+Mg |
| Stark City | 121.0 | 7.1 | Hard | Computed from Ca+Mg |
| Delta | 278.1 | 16.3 | Very hard | Computed from Ca+Mg |
| Ballwin | 242.0 | 14.2 | Very hard | County estimate |
| Camdenton | 227.0 | 13.3 | Very hard | County estimate |
| Newburg | 253.0 | 14.8 | Very hard | Computed from Ca+Mg |
| Urbana | 200.0 | 11.7 | Very hard | County estimate |
| Three Creeks | 291.0 | 17.0 | Very hard | Computed from Ca+Mg |
| Flint Hill | 286.9 | 16.8 | Very hard | Computed from Ca+Mg |
| Painton | 346.9 | 20.3 | Very hard | Computed from Ca+Mg |
| Leasburg | 151.3 | 8.8 | Hard | Computed from Ca+Mg |
| Fisk | 285.1 | 16.7 | Very hard | Computed from Ca+Mg |
| Bakersfield | 216.0 | 12.6 | Very hard | County estimate |
| Diggins | 113.3 | 6.6 | Moderately hard | Computed from Ca+Mg |
| Cainsville | 202.0 | 11.8 | Very hard | County estimate |
| Turner | 142.2 | 8.3 | Hard | Computed from Ca+Mg |
| Conception Jct | 255.2 | 14.9 | Very hard | Computed from Ca+Mg |
| Koshkonong | 280.9 | 16.4 | Very hard | Computed from Ca+Mg |
| Silex | 283.3 | 16.6 | Very hard | Computed from Ca+Mg |
| Haywood City | 100.7 | 5.9 | Moderately hard | Computed from Ca+Mg |
| Vanduser | 219.3 | 12.8 | Very hard | Computed from Ca+Mg |
| Coffey | 219.0 | 12.8 | Very hard | County estimate |
| Freistatt | 146.4 | 8.6 | Hard | Computed from Ca+Mg |
| Brandsville | 245.7 | 14.4 | Very hard | Computed from Ca+Mg |
| Hughesville | 421.2 | 24.6 | Very hard | Computed from Ca+Mg |
| Halfway | 327.7 | 19.2 | Very hard | Computed from Ca+Mg |
| Redings Mill | 133.0 | 7.8 | Hard | Computed from Ca+Mg |
| Louisburg | 279.4 | 16.3 | Very hard | Computed from Ca+Mg |
| Defiance | 223.0 | 13.0 | Very hard | County estimate |
| Ionia | 190.0 | 11.1 | Very hard | County estimate |
| Levasy | 309.5 | 18.1 | Very hard | County estimate |
| Springield | 192.6 | 11.3 | Very hard | Computed from Ca+Mg |
| Wappapello | 265.6 | 15.5 | Very hard | Computed from Ca+Mg |
| Beaufort | 216.0 | 12.6 | Very hard | Computed from Ca+Mg |
| Burfordville | 215.7 | 12.6 | Very hard | Computed from Ca+Mg |
| Eagle Rock | 164.5 | 9.6 | Hard | County estimate |
| Marshfield | 296.3 | 17.3 | Very hard | Computed from Ca+Mg |
| Roach | 227.0 | 13.3 | Very hard | County estimate |
| Wheatland | 208.5 | 12.2 | Very hard | County estimate |
Above 120 mg/L (7 gpg), scale is usually worth treating — see our water softener guide, or size a system with the hardness calculator & converter.
The Geology Behind Missouri's Water Hardness
Missouri sits in the Midwestern glacial-drift and carbonate bedrock region.
Ice-age glaciers ground up limestone and dolomite bedrock and spread it across the Midwest as thick, carbonate-rich drift. Groundwater percolating through that drift - and through the shallow carbonate bedrock beneath it - dissolves calcium and magnesium readily, which is why the USGS maps the region hard to very hard almost everywhere. Cities drawing Great Lakes surface water tend to run somewhat softer than their groundwater-supplied neighbors.
Missouri Water Hardness FAQ
Does Missouri have hard water?
Yes — across Missouri's measured cities, typical tap water is hard. The median is 178.4 mg/L (10.4 gpg) — hard on the USGS scale, where anything above 120 mg/L (7 gpg) counts as hard. 329 of Missouri's 426 measured cities fall in the hard or very hard bands (77%), so check your own city rather than the state average.
How hard is tap water in Missouri?
Across the 426 Missouri cities with measured values in our index, the median hardness is 178.4 mg/L (10.4 gpg) — hard on the USGS scale. Individual cities range from 4.8 to 567.4 mg/L, so check your own city rather than assuming the state number.
Which city in Missouri has the hardest water?
Leadington has the hardest measured tap water in our Missouri index at 567.4 mg/L (33.2 gpg) — very hard on the USGS scale. Rankings use measured utility values only; labeled county estimates and values under active dispute are excluded.
Do I need a water softener in Missouri?
329 of Missouri's 426 measured cities (77%) fall in the hard or very hard bands — above 120 mg/L (7 gpg), the level where most water treatment professionals suggest considering an ion-exchange softener. Hardness varies utility to utility, so look up your own city's value before sizing equipment.
How do I find my city's exact water hardness?
Enter your ZIP code in our free lookup at tapwaterdata.com/zip to see the value we hold for your Missouri city from utility-reported water quality data, check your water utility's annual Consumer Confidence Report (CCR), or use a home test-strip kit.
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