Montana coal mines can now pollute more during small storms

Montana wants to change its rules for coal mines. It would allow mines to exceed pollution limits for siltation structures if a series of small storms causes the problem and the mine operator tries to fix it.

This change means coal mine operators in Montana will have more flexibility to avoid penalties for pollution. It shifts the burden of proof from strict compliance to demonstrating effort after the fact. This could make it harder for regulators to enforce environmental standards during common weather events.