Montana Department of Environmental Quality

A new lawsuit claims the Montana Department of Environmental Quality failed to assess how nutrient pollution from septic systems near the town of Big Sky will harm the Gallatin River.

A Red Lodge property owner is assessing damage from a coal mine that flooded his hillside rental property.

Federal regulators call nutrient pollution one of the country's most widespread environmental problems. The state of Montana is trying to hammer out narrative standards to regulate it.

The Montana Department of Environmental Quality is investigating algal blooms along a section of the Gallatin River just north of Yellowstone National Park. Regulators will hold a public meeting in Big Sky and remotely to provide updates.

Cleanup will kick off again months after a train derailment in Stillwater County released thousands of pounds of oil material into the Yellowstone River.

The Montana Supreme Court says environmental regulators disregarded water quality laws when issuing a permit to a mine that provides coal to the Colstrip power plant in southeastern Montana.

Unified Command says reports over the last few weeks called for more cleanup of the oil-based waste along a section of the Yellowstone River in Stillwater County.

State regulators say fish sampled upstream and downstream of a June train derailment showed the presence of contaminants and prompted an advisory along the river from Stillwater County to Yellowstone County

NorthWestern Energy says it plans to appeal the decision.

Two electric buses are now carrying some students to and from school in Hill County in north-central Montana.