In the MS4 Area:
- Erosion prevention permits are required, depending upon a site's location, the type of project, and the amount of land that will be disturbed.
- Land disturbances that do not need a development permit (e.g., grading work and driveways) may still require an erosion prevention permit, even though a development permit is not required.
- Development permit applications that involve land disturbance, but do not require an erosion prevention permit, must submit a self-certification form.
Erosion Prevention Permit Triggers:
Within the MS4 Area, the following types of land disturbances will be required to obtain an erosion prevention permit:
- 1/4-acre or 400 cubic yards (CY) or more
- 5000 square feet (SF) or 200 CY or more AND located in a sensitive area with either:
- Slopes of 15% or greater, OR
- Highly erodible soils
- 5000 SF or 200 CY or more AND either:
- For commercial, industrial, or multi-family development, OR
- Located on a property that is zoned for commercial, industrial, or multi-family uses
Please reference the Erosion Prevention permit decision tree to help determine whether a permit is required for your project in the MS4 Area.
Submitting an Erosion Prevention Permit or a Self-Certification Declaration
When an erosion prevention permit is required, it must be submitted at the same time as, or prior to, submittal of the associated development permit. Erosion prevention permits must be approved prior to the beginning of any land-disturbing activities.
Self-certification declaration forms may be submitted with the development permit application.