Utilities
Power is supplied by the Lower Colorado River Authority, while the Guadalupe River is the main source of water. The natural gas supplier is CenterPoint Energy Entex. Seguin also maintains its own water supply.
| City of Seguin Utilities | (830) 401-2460 |
| Crystal Clear Water Supply | (830) 372-1031 |
| Green Valley Water Special Utility District | (830) 914-2330 |
| Guadalupe Valley Electric Cooperative Inc. | (830) 379-2114 |
| Guadalupe-Blanco River Authority | (830) 379-5822 |
| Lower Colorado River Authority | (830) 372-3850 |
| CenterPoint Energy | (830) 379-5207 |
| Springs Hill Water Supply | (830) 379-7683 |
| Telephone- AT&T | 1-800-222-0300 |
