Stormwater Program

Please report spills in the roadway to: 

Benton County Public Works: 541-766-6821 or through the online request form linked here.

Please report spills within the private land outside of the roadways to:

Benton County Environmental Health at 541-766-6841, via email at OR through our online feedback form to Community Development linked here.


Be ready to provide the location, severity, actions taken, and responsible party. Remember that early response protects our shared water quality!

Stormwater Program Background
Starting in 2007, Benton County staff from Community Development, Environmental Health, and Public Works developed and successfully implemented a National Pollutant Discharge Elimination System (NPDES) program (see program brochure).

The program requirements are part of the Clean Water Act that local governments and private organizations must comply with for discharges of pollutants into the waters of the United States and regulating quality standards for surface waters. This means that there are many actions that the County is taking in the ‘urbanized areas' around the cities of Corvallis and Philomath known as the Federal Urbanized Area.

The overall goal of the Benton County Stormwater Program is to reduce the volume of runoff from current development (for example parking lots, subdivisions) and the developing landscape, while reducing the amount of pollutants carried by stormwater runoff to our rivers and streams. In order to meet this overall goal Benton County staff has developed and implemented Six Minimum Control Measures.

Benton County Stormwater Management Plan (SWMP)
The Benton County Stormwater Management Plan was developed by Benton County Community Development, Environmental Health, and Public Works in 2007 and adopted by the Benton County Board of Commissioners. An update to the SWMP is currently in process to implements new requirements that go into effect beginning March 1, 2023. Previous versions of the SWMP can be found in the Document Library under the "Historical Documents" section. 

Stormwater Program Related Code Documents and Applications
To view specific stormwater features, ​please visit our Benton County Storm App: BC Storm App Link. Guidance for regulations and enforcement under the Stormwater Program are included in the Benton County Code as well as the Benton County Land Development Code in the following chapters:

To view Erosion & Sediment Control Permit information and documents, please visit the Erosion & Sediment Control Permit page.

Benton County Code                                                                    Land Development Code
Chapter 21: Nuisance Abatement                                                Chapter 87: Goal 5 Resources
Chapter 23: Solid Waste Management                                        Chapter 91: Specific Use Standards
Chapter 31: Enforcement                                                              Chapter 99: General Development Standards
Chapter 36: Illicit (Non-Stormwater) Discharges