| Business | Phone |
| Adams Engineering 18703 Evergreen Falls Dr, Katy 77450 | (281) 398-0490 |
| Hemphill Engineering Group Katy 77449 | (281) 347-9366 |
| Ray E Ory Consulting 1531 Carters Grove Ln, Katy 77449 | (281) 347-3868 |
| Raber Process Controls Inc 310 Gatemere Ct, Katy 77450 | (281) 395-9068 |
| Optimized Process Designs 26310 Clay Rd, Katy 77493 | (281) 371-2499 |
| Optimized Process Designs Inc 25610 Clay Rd, Katy 77493 | (281) 371-7500 |
| Walrus Consulting 24034 Wassail Way, Katy 77493 | (281) 347-3631 |
| Vfl Technologies 19715 Creekshore Dr, Katy 77449 | (281) 856-0162 |