Design & Construction Standards

Clean Water Services' Design and Construction Standards describe the administrative and technical requirements for the design and construction of residential or commercially developed sanitary and surface water management systems, erosion control methods and vegetated corridors. 

Current Design & Construction Standards:
R&O 19-5 as Amended by R&O 19-22

On November 12, 2019 the Clean Water Services (CWS) Board of Directors adopted amendments (R&O 19-22) to the current Design & Construction Standards (R&O 19-5). These amendments reflect updates to the standard engineering details (Appendix B), pump station standards (Chapter 9), as well as minor changes within the text to ensure clarity and consistency throughout the standards.

The current implementation policy adopted for those development projects in process at the time that the new Standards were adopted remains in effect. These projects may be designed in accordance with the last version of the Standards (R&O 17-5). See the implementation policy below for details on which R&O applies to a proposed project.

The non-amended version of R&O 19-5 is available under the Archived Documents and Context section on the D&C Update webpage.

Resolution & Order 19-22 & Table of Contents
Chapters
  • Chapter 1 (PDF, 213KB) - General Requirements and Administrative Provisions
  • Chapter 2 (PDF, 261KB) - Administrative Procedures
  • Chapter 3 (PDF, 388KB) - Sensitive Areas and Vegetated Corridors
  • Chapter 4 (PDF, 699KB) - Runoff Treatment and Control
  • Chapter 5 (PDF, 247KB) - Conveyance Design
  • Chapter 6 (PDF, 210KB) - Erosion Prevention and Sediment Control
  • Chapter 7 (PDF, 164KB) - General Construction Specifications for Conveyance Systems
  • Chapter 8 (PDF, 294KB) - Technical Specifications for Conveyance Systems
  • Chapter 9 (PDF, 816KB) - Wastewater Pump Stations and Force Mains
  • Chapter 10 (PDF, 121KB) - Septic Tank Effluent Pump (STEP) Systems
Appendix A - Planting Requirements
  • Appendix A (PDF, 227KB) - Planting Requirements
Appendix B - Standard Details
Hydromodification Map Web Tool

Implementation Policy

Project that do not require land use approval:

  • R&O 17-5 applies for projects submitted less than 180 days after April 22, 2019
  • R&O 19-5, as amended by R&O 19-22, applies for projects submitted more than 180 days after April 22, 2019

If a project requires land use approval:

  • R&O 17-5 applies for projects where land use application was made prior to April 22
  • R&O 19-5, as amended by R&O 19-22, applies for projects where land use application is made on or after April 22

Implementation Policy (PDF, 336KB) for the Update to the Design and Construction Standards provide further details about which Standards apply to a given project.

Prior Design & Construction Standards - R&O 17-5

Resolution & Order 17-5 & Table of Contents
Chapters
  • Chapter 1 (PDF, 80KB) - General Requirements and Administrative Provisions
  • Chapter 2 (PDF, 118KB) - Administrative Procedures 
  • Chapter 3 (PDF, 257KB) - Sensitive Areas and Vegetated Corridors
  • Chapter 4 (PDF, 114KB) - Runoff Treatment and Control
  • Chapter 5 (PDF, 101KB) - Conveyance Design
  • Chapter 6 (PDF, 63KB) - Erosion Prevention and Sediment Control
  • Chapter 7 (PDF, 49KB) - General Construction Specifications
  • Chapter 8 (PDF, 112KB) - Technical Specifications for Conveyance Systems
  • Chapter 9 (PDF, 2343KB) - Wastewater Pump Stations and Force Mains
  • Chapter 10 (PDF, 17KB) - Septic Tank Effluent Pump (STEP) Systems
Appendix A - Planting Requirements
  • Appendix A (PDF, 58KB) - Planting Requirements
Appendix B - Standard Details

Resources 

Low Impact Development Approaches Handbook

Clean Water Services and its partners completed the Low Impact Development Approaches (LIDA) Handbook to promote sustainable development practices for the Tualatin River Watershed in 2009. The LIDA Handbook is a supplement to the Clean Water Services' Design and Construction Standards and is to be used in conjunction with the Standards, other applicable regulations and local codes. 

Erosion Control Manual 

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