| Business | Phone |
| Air & Surface Water Program 523 E Capitol Ave, Pierre 57501 | (605) 773-3351 |
| Water Resources Assistance 523 E Capitol Ave, Pierre 57501 | (605) 773-4254 |
| Water Rights 523 E Capitol Ave, Pierre 57501 | (605) 773-3352 |
| State Engineer 523 E Capitol Ave, Pierre 57501 | (605) 773-3466 |
| Drinking Water Office 523 E Capitol Ave, Pierre 57501 | (605) 773-3754 |
| Ground Water Quality 523 E Capitol Ave, Pierre 57501 | (605) 773-3296 |