| Business | Phone |
| Bob J Johnson & Assoc Inc 16420 W Hardy Rd # 100, Houston 77060 | (281) 443-2225 |
| Texas Quality Water Resources 8834 Ballinger Dr, Houston 77064 | (281) 469-9227 |
| Geneva Purification Systems 8831 Sharpcrest St, Houston 77036 | (713) 520-5900 |
| Hydrotreat Inc 12311 Amelia Dr, Houston 77045 | (713) 434-9400 |
| Mueller Water Conditioning Inc 1500 Sherwood Forest St, Houston 77043 | (713) 467-3226 |