Design & Construction Standards Update

Phase 1 Revised Standards Take Effect April 22, 2017

Phase 1 proposed revisions to the Design & Construction Standards are complete, archived materials are listed below. CWS staff will conduct Phase 2 of the update process now through April 2019. To receive updates and meeting announcements join our email list or check this webpage. Those who joined the email list during Phase 1 will continue to receive announcements for Phase 2. 

Update Process 

Clean Water Services works with our community and partners to provide cost-effective and environmentally sensitive management of water resources for the Tualatin River Watershed. Part of that work is to provide Design & Construction Standards for sanitary sewer and surface water management that are periodically revised. The update process is necessary to incorporate changes in permits, and to reflect new technologies, approaches and development patterns. 

 Update process timeline as it relates to permit requirements.

Phase 1 Archive


As part of Phase 1 of the Update process, Clean Water Services has completed proposed revisions to the Design & Construction Standards. At a public hearing on March 28, the Board of Directors adopted the revised Design & Construction Standards (R&O 17-05). The revised Phase 1 Standards will take effect on April 22, 2017.

The first phase focused on the requirements from our new Watershed Based permit that needed to be implemented in the Standards by April 22, 2017 and April 22, 2018. These requirements included a new 1,000 square foot impact area threshold for water quality treatment and prioritization of Low Impact Development Approaches (LIDA) as the first consideration for water quality treatment. Additionally, we incorporated topics from our extensive 2012/2013 update effort. The stakeholder outreach included an initial Public Launch Meeting on September 7, 2016 for general interest followed by a series of meetings/discussions about key topics. These meetings provided cross-stakeholder updates for issues, and discussions of concerns, support and potential options and solutions.

Phase 1 Timeline

Phase 1 Permit Driver Topics

  • Water Quality Threshold 
  • LIDA Prioritization

Phase 1 Other Anticipated Topics


  • LIDA incentives
  • Redevelopment Table 4-1
  • Storm Master Planning
  • Turf fields with underdrains
  • Planting requirements for WQ Facilities

Erosion Control

  • Erosion Control Permit Threshold
  • BMPs for stream/wetland restoration projects


  • Sanitary Conveyance from Private System
  • Storm Connections to Sanitary (example: trash enclosures, wash pads)

Procedural (Housekeeping)

  • Update 1200C/CN language
  • Maintenance Plans
  • Two Year Maintenance Period for Filter Vaults
  • LIDA Lot Submittal Requirements
  • Approved Product List
  • Model Homes
  • Update Standard Details
  • Typo and Reference Corrections
Final Proposed Draft & Board Packet

Material provided for the Public Hearing 

Preliminary Drafts

This is an archive of the drafts that were provided for review and comment. Current draft standards are available here (PDF, 12.4MB). 

Chapter 1: General Requirements Administrative Provisions (PDF, 74KB)

Chapter 2: Administrative Procedures (PDF, 187KB)

Chapter 4: Runoff Treatment and Control (PDF, 1.21MB)

Chapter 6: Erosion Prevention and Sediment Control (PDF, 160KB)

Chapter 9: Waste Water Pump Stations and Force Mains (PDF, 360KB)

Appendix B: Standard Details (PDF, 5.6MB)

Appendix B: Revised or New Details (PDF, 1.32MB) 

Background Papers
Meeting Materials

D&C Update Kickoff Presentation (PDF, 5MB)

October 6, 2016 Meeting Note (PDF, 247KB)


For meeting announcements and updates join our email list

Send questions or comments to

Damon Reische
Planning & Development Division Manager

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