| Lab Number | Lab Name | City | State |
|---|---|---|---|
| 911406 | Emery Sapp and Sons Gravette Laboratory | Sulphur Springs | AR |
| 903300 | Emery Sapp and Sons Sonora Laboratory | Springdale | AR |
| 922521 | Emery Sapp and Sons Fort Smith Laboratory | Fort Smith | AR |
| 924124 | Emery Sapp and Sons Berryville Laboratory | Berryville | AR |
| 901200 | ETTL Engineers & Consultants, Inc. ETTL - Texarkana Laboratory | Texarkana | AR |