Montana Department of Environmental Quality

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.

Conservationists and residents this week protested a planned 175-megawatt natural gas plant in Laurel, just southwest of Billings.

Montana environmental officials found PFAS — a family of chemicals that studies link to cancer in humans along with other negative health effects — near Malmstom Airforce Base and the Billings Logan International Airport, among other sites.

State environmental officials are accepting public comment on a proposal to reissue a hazardous waste permit for Malmstrom Air Force Base.

State environmental regulators responded to EPA disapproval to the new nutrient pollution standards.

The state Department of Environmental Quality has issued harmful algal bloom advisories for several bodies of water around Helena. But a water-borne parasite could also be the culprit behind the itching and rashes some swimmers are reporting.

Gov. Greg Gianforte said in a news release he and the Montana Department of Environmental Quality worked with the Montana League of Cities and Towns on a simpler construction permitting process. They created a template contract to have city governments review public water supply plans for building projects.

In a neighborhood near the mining town of Butte, many people have a hard time believing the air they are breathing is safe.