Water Quality Permits

Water Quality Permits (WQP)

• If work is performed on the site outside an existing building, a Water Quality Permit may be needed. The design of water quality facilities and erosion control plans must be prepared by an Oregon licensed Civil Engineer.
  • If the site outside an existing building is modified or disturbed and meets the following conditions, it is likely that a WQP is required. In addition, the installation or improvement of storm water treatment and storm water detention facilities will be required:
     
    • If you disturb existing impervious (hard surface such as asphalt or concrete) area down to gravel
    • If the disturbance is larger than 1,000 square feet
    • If the project tax lot(s) doesn’t have water quality treatment and detention per current Clean Water Services Design and Construction Standards, Chapter 4
       
• If the site disturbance is 500 square feet or more, an Erosion Control Permit from the City is also required.
  More information about the Erosion Control Permit 

Please call the Development Engineering Associate with any engineering questions at 503.691.3035.