What is the purpose of the CGP?
The purpose of the construction general permit (CGP) is to protect the quality and beneficial uses of Arizona’s surface water resources from pollution in stormwater runoff from construction activities. Under the Clean Water Act and Arizona Revised Statutes, it is illegal to have a point source discharge of pollutants, including stormwater runoff from construction sites, to a water of the United States that is not authorized by a permit. To protect water quality, the CGP requires operators to plan and implement appropriate pollution prevention and control practices for stormwater runoff during the construction period. These best management practices, or BMPs, help control erosion and sediment transport; but also include good housekeeping practices and other controls to reduce construction chemicals and other pollutants.
