| Business | Phone |
| Columbia Heights Water Dist 167 Water Plant Rd, Columbia 71418 | (318) 649-5852 |
| Columbia Water Plant 333 Boyd St, Columbia 71418 | (318) 649-6875 |
| East Columbia Water District 4518 Highway 4 E, Columbia 71418 | (318) 649-2788 |
| Hebert Water Systems Inc 6350 Highway 561, Columbia 71418 | (318) 649-0409 |