Major Water Users - Groundwater Data by County
| Adair | Clay | Iron | Montgomery | Schuyler |
| Andrew | Clinton | Jackson | Morgan | Scotland |
| Atchison | Cole | Jasper | New Madrid | Scott |
| Audrain | Cooper | Jefferson | Newton | Shannon |
| Barry | Crawford | Johnson | Nodaway | Shelby |
| Barton | Dade | Knox | Oregon | St. Charles |
| Bates | Dallas | Laclede | Osage | St. Clair |
| Benton | Daviess | Lafayette | Ozark | St. Francois |
| Bollinger | DeKalb | Lawrence | Pemiscot | St. Louis |
| Boone | Dent | Lewis | Perry | St. Louis City |
| Buchanan | Douglas | Lincoln | Pettis | Ste. Genevieve |
| Butler | Dunklin | Linn | Phelps | Stoddard |
| Caldwell | Franklin | Livingston | Pike | Stone |
| Callaway | Gasconade | Macon | Platte | Sullivan |
| Camden | Gentry | Madison | Polk | Taney |
| Cape Girardeau | Greene | Maries | Pulaski | Texas |
| Carroll | Grundy | Marion | Putnam | Vernon |
| Carter | Harrison | McDonald | Ralls | Warren |
| Cass | Henry | Mercer | Randolph | Washington |
| Cedar | Hickory | Miller | Ray | Wayne |
| Chariton | Holt | Mississippi | Reynolds | Webster |
| Christian | Howard | Moniteau | Ripley | Worth |
| Clark | Howell | Monroe | Saline | Wright |
