Skip to content

County of Asotin

Regional Stormwater Program

Inform. Educate. Prevent.

Stormwater Management Plans & Elements

The Phase II Permit outlines stormwater program activities and implementation goals that permittees must complete to comply with the federal Clean Water Act (CWA).

All Phase II jurisdictions are required to develop and implement a stormwater management plan (SWMP) that includes the required activities (minimum control measures), implement those activities within the required timeframes, and submit annual reports to Ecology to document progress towards program implementation goals.

The City of Asotin, City of Clarkston and Asotin County have signed an Interlocal Cooperation Agreement to work together to implement a regional stormwater management program that is designed to meet the requirements of the Phase II permit. Through this regional approach, they hired a regional stormwater program coordinator to assist them in implementing the Phase II Permit and meeting the requirements and deadlines of the Permit.

Stormwater Plan Elements

A Stormwater Management Plan outlines what is currently being done in each City or County to prevent stormwater pollution, and what will be done in the future. Six minimum measures must be incorporated into the plan. These measures are (click on each one for more information):

Previous Deadlines

The previous permit expired in 2012, several deadlines were met, including some that require public participation and review. Click here to see a full schedule.

What is a stormwater plan?

A Stormwater Management Plan outlines what is currently being done in each City or County to prevent stormwater pollution, and what will be done in the future.

Each City and County has 5 years to write and fully implement their Plan. In that time they must each adopt a series of ordinances that gives them the authority to regulate stormwater discharges from new development and eliminate illegal discharges to storm drains. The main goal of the Stormwater Management Plan is to improve the quality of stormwater that reaches the area waterbodies.

The benefits from implementing a stormwater management program are numerous. Both the Snake River and Asotin Creek are home to Steelhead and Chinook salmon that have been listed on the Endangered Species List. Both require clean, cool water for spawning and rearing of juvenile fish. Our stormwater system discharges water into both the Snake River and Asotin Creek. Implementing the stormwater management program will reduce the pollutants, sediments, and other non-stormwater additives from entering the river and stream.

Additionally, the stormwater management program will result in cleaner streets and better management of stormwater issues in Asotin, Clarkston and urban Asotin County.