Grading and Erosion Control

What is the purpose of and Grading and Erosion Control Permit?

The Grading and Erosion Control Permit ensures that clearing, grading, and fill work is performed in accordance with approved plans and in a manner that does not adversely affect adjacent properties. It also ensures that the rules that have been established to protect and enhance the quality of the Tualatin River watershed are followed during and after construction. Even though a construction project might be small, the cumulative effect of sediment loss from all project sites necessitates maximum effort to prevent sediment from entering the waterways directly or through the storm collection system.

Image of machine clearing land  Image of E-Tech Recycling land

How do I know if I need a Grading and Erosion Control Permit for my construction project?

A Grading and Erosion Control Permit is required when one or more of these conditions apply to your site:

  • There is soil disturbance of over 500 square feet.
  • The amount of excavation, fill or combination thereof exceeds 20 cubic yards.
  • The slope of the site is greater than 20%.
  • A land use approval requires a Grading and Erosion Control Permit.

View an example Single Family Grading & Erosion Control site plan for demolition.

How do I apply for a Grading and Erosion Control Permit?

The process to apply for a Grading and Erosion Control Permit is determined by the site disturbance area. Please refer to the Grading and Erosion Control Permit Guidelines for information on permit application submittal requirements based on site disturbance area.   

Additional Helpful Web Pages

DEQ 1200-CN Plan Checklist

DEQ 1200-C Plan Checklist

Clean Water Services Permitting Process website

Oregon Department of Environmental Quality (DEQ) Water Quality Permit Program website

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