Water Quality Permit

A Water Quality (WQ) Permit is required if the proposed development creates and/or modifies 1,000 square feet or greater of impervious surface, or if it increases the amount or rate of surface water leaving the project site. A Water Quality Permit is also required to construct or modify a public or private water quality facility.

Prior to submitting an application for a Water Quality Permit, please attend a preapplication meeting with the Engineering Division by emailing us at Engineering@tualatin.gov. Required attendees include the owner, the design engineer, and the contractor if known. Once you are familiar with the permitting process, please review the supporting documents below.

Typically, the following documents and items must be completed and approved prior to a Water Quality Permit being issued:

• City Approved Stamped Construction Drawings
• Construction Improvement Agreement
• Performance Bond
• Proof of Minimum Insurance Coverages
• Private Stormwater Facilities Agreement
• Hold an on-site Pre-Construction Meeting (to be scheduled by the Engineering Division)

When you are ready, apply online.

Tualatin's Standard Drawings and design and construction requirements can be found in the Public Works Construction Code.

To access Clean Water Services Design and Construction Standards and their standard details, please visit their website: CWS Design and Construction Standards.

To learn more about Tualatin's Private Water Quality Facility Program, please visit our Program Website.

For Water Quality Permit inquiries or Inspection Requests, please call 503-692-2010, or email here.