National Pollutant Discharge Elimination System (NPDES)

NPDES Phase II Stormwater Permit

Under a directive from the EPA, the Washington State Department of Ecology issued Spokane County a National Pollutant Discharge Elimination System (NPDES), Eastern Washington Phase II Municipal Stormwater Permit (NPDES Permit) in February 2007. The guiding law behind the NPDES Permit is the Federal "Clean Water Act," which regulates the discharge of pollutants to waters of the United States.

Here's the link to view the current Eastern Washington Phase II Municipal Stormwater Permit (NPDES Stormwater Permit).  It is also available on the Ecology Website.

NPDES Annual Reports

Frequently asked questions about Municipal Stormwater Permits can be viewed here.

Questions about the NPDES Permit can be directed to Washington State Department of Ecology Eastern Region.  Click here.

NPDES - Pollution Prevention Ordinance
On July 21, 2009 the Spokane County Board of of County Commissioners approved amendments to Spokane County Code, Chapter 9.14, Roads, Approach and Drainage in New Construction, to meet the state mandated pollution prevention requirements of the Eastern Washington Phase II Municipal Stormwater Permit (NPDES Permit). This ordinance is designed to prevent water pollution and protect water quality within our rivers, lakes, streams, and aquifer. View Spokane County Code, Title 9, Chapter 9.14 (PDF).


Stormwater Management Program
Spokane County is required to accomplish tasks associated with six (6) minimum control measures: education and outreach; public involvement and participation; illicit discharge detection and elimination; construction site runoff and post construction management; and pollution prevention and good housekeeping for municipal operations. To learn more about the NPDES Permit and minimum control measures visit their website.

In accordance with the NPDES Permit, Annual Reports have been completed annually and submitted to the Department of Ecology. Each Annual Report includes an updated draft copy of the Spokane County Stormwater Management Program (SWMP). The SWMP is currently a public working document until formal adoption procedures are completed prior to the end of the five year permit cycle in 2012. The Annual Report is too large to be linked for public access. The link below will take you to the Spokane County Draft Stormwater Management Program. Both documents are available for public review and comment.


Stormwater Operations and Maintenance Plan
In 2010, the NPDES Permit required the development of a Stormwater Operations and Maintenance Plan (O&M Plan) for municipal operations. The O and M Plan includes all Spokane County departments' facilities, properties and related activities that have the potential to impact surface water quality.

The NPDES Permit requires implementation of all activities described within the O&M Plan by August 15, 2011. The plan's requirements are described within the NPDES Permit under "Pollution Prevention and Good Housekeeping for Municipal Operations" (S5.B6.). View the Spokane County Stormwater O&M Plan (PDF).