Design & Construction Standards

View the Standards

Clean Water Services’ 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


  • Chapter 1 (PDF) – General Requirements and Administrative Provisions
  • Chapter 2 (PDF) – Administrative Procedures
  • Chapter 3 (PDF) – Sensitive Areas and Vegetated Corridors
  • Chapter 4 (PDF) – Runoff Treatment and Control
  • Chapter 5 (PDF) – Conveyance Design
  • Chapter 6 (PDF) – Erosion Prevention and Sediment Control
  • Chapter 7 (PDF) – General Construction Specifications for Conveyance Systems
  • Chapter 8 (PDF) – Technical Specifications for Conveyance Systems
  • Chapter 9 (PDF) – Wastewater Pump Stations and Force Mains
  • Chapter 10 (PDF) – Septic Tank Effluent Pump (STEP) Systems

Appendix A – Planting Requirements

Appendix B – Standard Details

Hydromodification Map Web Tool


Approved Products

Low Impact Development Approaches Handbook

Erosion Control Manual 

Tualatin River Urban Stormwater Tool (TRUST)

Past Standards (not current)