County of Asotin

Regional Stormwater Program

Inform. Educate. Prevent.

Construction Site Runoff Control Regulatory Requirements

The cities of Clarkston and Asotin and Asotin County adopted a construction ordinance that also requires CESCL inspections for large projects that disturb one acre or more; and requires planning for and installation of erosion and sediment control practices for medium projects disturbing more than 5,000 sq. ft but less than one acre. To review the ordinances, click here.

The goal of these permits is to reduce or eliminate stormwater pollution and other impacts to surface waters from construction sites. Construction site activities disturb the land and, when it rains, can create a lot of muddy, polluted stormwater. When this muddy stormwater runs off-site (also known as discharge), it often causes sediment increases and alters the water chemistry in local streams, rivers, wetlands, and lakes. This lowers water quality and often harms the uses that humans, fish, and other wildlife rely upon.

The CESCL training will prepare construction site operators to manage construction sites that require the permit issued by Asotin County, City of Asotin or City of Clarkston for both medium and large projects as well as Department of Ecology’s construction stormwater permit.

For an overview of CESCL training and more information on Construction Stormwater Permits, click here.