Idaho Code § 47-1315

Where any person conducts a placer or dredge mining operation where the water used in such mining process flows in, or into a natural watercourse, such person shall construct and use settling ponds of sufficient capacity and character and/or install and use filtration processes fully adequate to clarify the water used in the mining process to conform to the standards and rules of the state department of environmental quality regarding water quality as authorized under chapter 1, title 39, Idaho Code, before such water is discharged into the natural watercourse.