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!

Benton County Stormwater Management Plan
This plan was developed by Benton County staff from Community Development, Environmental Health, and Public Works in 2007. The plan was adopted by the Benton County Board of Commissioners and is being reviewed by the Oregon Department of Environmental Quality. An update to the plan was completed in 2011 as required by State and Federal law (see ODEQ permit renewal application package requirements linked below).

  1. Benton County Stormwater Management Plan (2007)
  2. Benton County Stormwater Management Plan (2011)
  3. ODEQ Permit Renewal Application Package Requirements

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 ‘urban areas' around the cities of Corvallis and Philomath known as the Federal Urbanized Area (map also available at link below).

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.

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:

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 36: Illicit (Non-Stormwater) Discharges                        Chapter 99: General Development Standards