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Backflow Prevention is Essential in Maintaining Clean, Safe Water

What is Backflow?

Backflow describes water that moves in the opposite direction than originally intended. Backflow is important to prevent in water systems that connect potable water to non-potable water, because the chance of contamination is much higher. This type of contamination hazard stems from unprotected cross connections. 

Backflow Devices and Testing

Under Oregon Administrative Rule 333-061-0070 (5), as a water supplier, Boring Water is responsible for assuring property owners are in compliance with testing requirements. We are committed to providing water that is safe to drink, and our top priority is public health. To ensure this, backflow device testing and monitoring is made a top priority.

Our Responsibility 

Boring Water conducts a Cross-Connection Control program to protect the public water system from hazardous cross connections and backflow. We work closely with consumers, architects, contractors, and engineers to ensure that all those who are required by law, comply with cross-connection control and/or backflow prevention.

Cross Connection 

Customers can unknowingly alter water quality with activities in their homes or businesses. These activities usually involve “Cross Connections” that create unprotected links from a private water system to a public system.

Common examples of Cross Connection

  • Submerged Hoses

  • Irrigation

  • Lawn sprinkler systems

  • Swimming pools and hot tubs

  • Water features and fountains

Backflow Prevention Assemblies 

Hose Bib Vacuum Breaker

Hose Bib Vacuum Breaker

Common applications include: hoses, swimming pools, wash tubs, and utility sinks.

  • Easy to install

  • No test requirements

  • Limited backflow prevention

Double Check Valve Assembly

Double Check Valve Assembly (DCVA)

The most common residential assembly. Common applications include: Lawn irrigation and fire sprinkler systems.

  • May be installed below ground

  • Requires annual test

  • Protects against many but not all hazardous conditions

Atmospheric Vacuum Breaker (AVB)

These devices are not allowed as they cannot be tested to confirm they are working properly.

Atmospheric Vacuum Breaker
Reduced Pressure Backflow Assembly

Reduced Pressure Backflow Assembly (RP)

Common applications include: swimming pool pump systems, chemical injection systems and premises with an auxiliary water supply.

  • Must be installed above ground

  • Requires annual test

  • Highest protection

  • Must protect from freezing

Pressure Vacuum Breaker

Pressure Vacuum Breaker (PVB)

Common applications include: lawn irrigation systems

  • Must be installed a minimum 12” above the highest downstream piping

  • More susceptible to freezing than the DCVA

  • Requires annual test

  • Must protect from freezing


Oregon Health Authority- List of Approved Backflow Testers 

Educational video regarding cross-connection control and/or backflow prevention 

For questions regarding assembly requirements and approvals for meter protection, fire protection or for more information about this program, please contact the office at 503-663-4594 or via email at

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