The new permit will go into effect December 1 and requires nearly 100 fish farms to collectively reduce the amount of phosphorous emptied into the river by 40%.
The EPA permit covers the entire state and involves producers of rainbow trout, salmon, catfish as well as state fish hatcheries.
But the area of biggest concern is along a 55-mile stretch of the Snake River, home to more than 80% of Idaho's aquaculture industry.
The hope is that lower phosphorous levels ... a chemical byproduct of fish waste ... will eliminate excess algae and weed growth in the river and improve water quality.
New Snake River permits aim to lower pollution
US - The Environmental Protection Agency is issuing a new series of permits designed to lower pollution levels from fish farms discharging waste into the Snake River.