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Water Distribution Construction Resources


Questions about water system construction?

Send us an email or give us a call at 541-685-7595.

We are committed to supporting water system construction by developers in the EWEB service area. The resources on this page are references to help guide developers through the steps to build water infrastructure additions.

EWEB Water Distribution Design and Construction Standards

Approved Assembly List:

OHA Approved Assembly list

Backflow installation design standards:

Airgap Backflow Protection
AMES SS SE Detector Double Check Valve Assembly 2.5-10 Inches Above Ground
AMES SS SE Detector Double Check Valve Assembly 2.5-10 Inches Below Grade
AMES SS SE Double Check Valve Assembly 2.5-10 Inches Above Ground
AMES SS SE Double Check Valve Assembly 2.5-10 Inches Below Grade
Atmospheric Vacuum Breaker
Detector Double Check Valve Assembly 2 Inches Above Ground 
Detector Double Check Valve Assembly 2 Inches Below Grade
Detector Double Check Valve Assembly 2.5-10 Inches Above Ground 
Detector Double Check Valve Assembly 2.5-10 Inches Below Grade
Double Check Valve Assembly 0.5-2 Inches Above Ground 
Double Check Valve Assembly 0.5-2 Inches Below Grade
Double Check Valve Assembly 2.5-10 Inches Above Ground 
Double Check Valve Assembly 2.5-10 Inches Below Grade
FEBCO N-Pattern Detector Double Check Valve Assembly 2.5-10 Inches Above Ground 
FEBCO N-Pattern Detector Double Check Valve Assembly 2.5-10 Inches Below Grade
FEBCO N-Pattern Double Check Valve Assembly 2.5-10 Inches Above Ground     
FEBCO N-Pattern Double Check Valve Assembly 2.5-10 Inches Below Grade
Pressure Vacuum Breaker Assembly
Reduced Pressure Backflow Assembly 0.5-2 Inches Above Ground
Reduced Pressure Backflow Assembly 0.5-2 Inches Below Grade
Reduced Pressure Backflow Assembly 2.5-10 Inches Above Ground
Reduced Pressure Backflow Assembly 2.5-10 Inches Below Grade
Spill-Resistant Vacuum Breaker Assembly