Districts using Halff GMS: Brazos Valley GCD, Brush Country GCD, Brewster County GCD, Cow Creek GCD, Culberson County GCD,
Duval County GCD, Evergreen UWCD, Fayette County GCD, Gonzales County UWCD, Hemphill County UWCD, Lone Star GCD, Lost Pines GCD, Mid-East Texas GCD,
Middle Pecos GCD, Middle Trinity GCD, Northern Trinity GCD, Panhandle GCD, Panola County GCD, Pecan Valley GCD, Post Oak Savannah GCD, Prairielands GCD,
Presidio County UWCD, Reeves County GCD, Rusk County GCD, Sandy Land UWCD, Trinity Glen Rose GCD