| State | Host | Website |
| Alabama | Auburn University | Soil, Forage and Water Testing Lab |
| Arkansas | University of Arkansas | Soil Testing and Research Lab |
| Florida | University of Florida | Analytical Services Lab |
| Georgia | University of Georgia | Agriculture and Environmental Services Lab |
| Kentucky | University of Kentucky | Soil Laboratory Services |
| Louisiana | Louisiana State University | Soil Testing and Plant Analysis Lab |
| Mississippi | Mississippi State University | Soil Testing Lab |
| Missouri | Missouri University | Soil and Plant Testing Lab |
| North Carolina | North Carolina Dept. of Ag | Agronomic Services – Soil Testing |
| Oklahoma | Oklahoma State University | Soil, Water and Forage Analytical Lab |
| Puerto Rico | | |
| South Carolina | Clemson University | Agricultural Services Lab |
| Tennessee | University of Tennessee | Soil, Plant and Pest Center |
| Texas | Texas A&M | Soil, Water and Forage Testing Lab |
| Texas | Stephen F Austin | Soil, Plant, and Water Analysis Lab |
| Virginia | Virginia Tech | Soil Testing Lab |
| West Virginia | West Virginia University | Soil Testing Lab |