Provide nutrient pollutant loading offsets

This bill allows industrial facilities and other permitted water polluters in Montana to receive credits, known as nutrient pollutant loading offsets, when they reduce nutrient pollution in local watersheds. These credits enable facilities to legally discharge more nutrients or reduce pollution from other sources, provided the overall nutrient load in the watershed decreases. The law sets specific credit values based on where pollution reductions occur, awarding full credits for point source reductions, 80% for upstream nonpoint source reductions, and 50% for downstream nonpoint source reductions. It also directs the state environmental department to establish standardized credit amounts for conservation projects like riparian fencing, wetland development, and septic system removal. The bill requires the department to update existing policies and regulations to implement this nutrient trading system.