| Office | Address | City | State | Postal Code | Phone | FAX | |
|---|---|---|---|---|---|---|---|
| Business Office | 1 1st Ave S | Great Falls | MT | 59401 | 406-791-7500 | 406-791-7560 | Montana Customer Service |
| Cascade | MT | 800-570-5688 | Montana Customer Service | ||||
| Billing and Credit | 1 1st Ave S | Great Falls | MT | 59401 | 406-791-7510 | 406-791-7560 | Montana Customer Service |
| Emergency Service, Leaks, No Heat | 1 1st Ave S | Great Falls | MT | 59401 | 406-791-7510 | 406-791-7560 | Montana Customer Service |
| Before you Dig Line Location | 800-424-5555 | Montana Customer Service | |||||
| Mailing Address | PO Box 2229 | Great Falls | MT | 59403 | 406-791-7510 | 406-791-7560 | Montana Customer Service |
