| Business | Phone |
| Billings Water Supply 234 Sandy Oaks Dr, Seguin 78155 | (830) 379-0910 |
| Crystal Clear Water Supply 2370 Fm 1979, Seguin 78155 | (830) 372-1031 |
| Guadalupe Blanco River Auth 933 E Court St, Seguin 78155 | (830) 379-5822 |
| Springs Hill Water Supply Corp 5510 S Highway 123 Byp, Seguin 78155 | (830) 379-7683 |