County of Asotin

Regional Stormwater Program

Inform. Educate. Prevent.

Notice of Temporary Hours of Operation. Due to the current staffing shortage Public Works offices will be closed on Fridays. Request for permits, information, and maps will take additional time to process. Please contact Public works at 509-243-2074 for assistance. We apologize for the inconvenience and thank you for your patience.

About This Website

This web site is designed to inform the public about the Stormwater Management Program, established by the City of Asotin, City of Clarkston and Asotin County in response to our new Stormwater regulatory obligations.

This site will be updated on a regular basis, so please check back. More information will be added as it is available.

Current Stormwater Management Plan (SWMP)

The NPDES Phase II Permit requires that Stormwater Management Plans and Annual Reports are submitted each year to the Department of Ecology by March 31st and made available to the public by May 31st. The public comment period for the Stormwater Management Plan is from March 31st to May 15th. To view the current Stormwater Management Plans, see the link below. If you have comments on the SWMP or need to view these documents in another format, contact

Jeff Wiemer
Regional Stormwater Coordinator
509-243-2071 Ext 1430

2021 Regional Stormwater Management Plan

Project Highlights

As a part of our program, the Regional Stormwater Maintenance Crew addresses stormwater drainage issues. The slide shows below highlight some projects that were accomplished. Explore our projects here.

Tips For Contractors and Design Professionals

Contractors and Design Professionals get help here to navigate through the requirements of the construction ordinances recently adopted by City of Asotin, City of Clarkston, and Asotin County.


If you have any questions, please contact Jeff Wiemer, Regional Stormwater Coordinator, at 509-243-2071 or


To report a spill or some other Stormwater problem, call 509-243-2071. For emergencies, call 911.

Upcoming Meetings

Management Team Meeting

September 13, 2021 from 3:00 - 4:00.

Asotin County Annex Board of Commissioners Chambers

100 2nd Street, Asotin, WA


Next Meeting Date:

December 13, 2021