Calumet is conducting planned maintenance activities throughout the facility, including routine alarm testing, scheduled equipment upgrades and asset inspections supported by specialized contractors.

These inspections are a key part of Calumet’s ongoing efforts to proactively maintain equipment integrity and support safe, reliable, and environmentally responsible operations, according to company release.

During this period, neighbors may observe increased flaring and elevated noise levels.

Earthquake hits Great Falls, no impact to Malmstrom, NorthWestern Energy, Calumet operations

As part of this maintenance, Calumet will test its emergency notification system on March 11, at noon and 7:30 p.m.

Residents and businesses in the surrounding area may hear audible alarms at these times.

These alarms are part of a scheduled test only.

No public action is required.

Calumet, state reach settlement in multiyear tax dispute [2025]

“These tests and maintenance activities are essential to maintaining our safety and environmental performance,” Mariah Mandt, general manager, said in a release. “Routine inspections and upgrades help us sustain reliable operations, enhance environmental compliance, and limit unplanned events. We appreciate our neighbors’ understanding as we complete this important work.”

Calumet said its ongoing maintenance investments have contributed to a significant reduction in flaring compared to last summer.

City working on options for gate at railroad crossing BNSF intends to expand for Calumet [2025]

“Calumet remains committed to transparency, safe operations and responsible engagement with the Great Falls community,” according to the company.

For questions or concerns, contact Calumet at greatfallscommunity@calumet.com or 406‑761‑4100.