Design & Construction Standards

Clean Water Services' (CWS) Design and Construction Standards describe administrative and technical requirements for development and construction activities that occur within CWS’ jurisdictional boundary.

The Standards address a range of topics including the design and construction of sanitary sewer and surface water management systems, erosion control methods and natural resources protection. 

Design & Construction Standards (Current): R&O 19-5 as Amended by R&O 19-22, adopted November 12, 2019

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

Archived Design & Construction Standards: R&O 17-5

This archived version of the Standards, R&O 17-5, may be used for projects with a land use application date prior to April 22, 2019. Review the Implementation Policy (PDF, 336KB) for details about whether this version of the Standards may apply to a given project.

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

Erosion Control Manual 

Tualatin River Urban Stormwater Tool (TRUST)

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