Document Library

Benton County Stormwater Program – Document Library

This page serves as a collection point for all Stormwater Program-related documents and resources found throughout the Program website.

Select a category to be directed to associated information:

NPDES Permit (2019-2024)

The Benton County National Pollutant Discharge Elimination System (NPDES) permit is a legally binding agreement documenting specific requirements that the county must implement in order to fulfill permit obligations.

Stormwater Management Plan (2022)

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).

Annual Reports to Oregon Dept. of Environmental Quality

Annual Reports are submitted by Benton County to the Oregon Department of Environmental Quality, documenting progress towards implementation of the Benton County Stormwater Plan and National Pollution Discharge requirements.

Application Forms for Benton County Residents

Erosion and Sediment Control and Stormwater Management permit applications for residents of Benton County.

Benton County Permits

Benton county is a permitted through the Department of Environmental Quality's National Pollutant Discharge Elimination System (NPDES). The following documents are Benton County's application and permit.

Maps and GIS Resources

The following provide geographically-referenced information about the Benton County Stormwater Program and stormwater infrastructure.

Benton County Stormwater Code

Sections of the Benton County Code that relate to stormwater quality and management.



Best Management Practices

Stormwater Educational Documents

If you would like to learn more about water quality, check out the following information:

2012 Benton County Erosion & Sediment Control Manual

Erosion & Sediment Control Best Practices Training Materials for Benton County Employees

All Benton County employees who perform duties related to erosion and sediment control must be trained on Best Management Practices within 30 days of hire, and should review these materials annually. Public Works staff can also provide in-person training opportunities for staff or departments. Please contact Survey & Engineering.

Clicking on the presentation links will download the Powerpoint presentation. Start the slide show to view the recording, or click SHIFT+F5 to start. This presentation includes narration so please ensure your audio is on.