Idaho State Overview

The State of Idaho and the Idaho Department of Environmental Quality (IDEQ) administer the Federal Construction General Permit (CGP) for stormwater discharges associated with construction activities. Such discharges define the runoff of any pollutants into waters of the United States (Idaho) from areas where land disturbing activities (clearing, grading or excavation) occur, or where construction materials or equipment are located. The EPA expects that compliance with the conditions of this permit will result in stormwater discharges that adhere to Federal water quality standards.  This permit authorizes the discharging of stormwater runoff from construction sites where:

(1)   Land disturbing activities are equal to, or greater than one (1) acre of total land.

(2)   Construction activities involve less than one (1) acre of total land area, but are part of a common plan of development or sale equal to or greater than one (1) acre of land.

(3)   Your project is located in an areas where EPA is the permitting authority.

*Permit number IDR120000, The Federal Construction General Permit, authorizes coverage for stormwater discharges within Idaho, except Indian country. Excluding Duck Valley Reservation Lands, Indian country within the State of Idaho is covered under permit number IDR120001.

            (4) As designated by the Environmental Protection Agency (EPA), Stormwater discharges including stormwater runoff, snowmelt runoff, and surface runoff and drainage associated with construction activities.