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Assembly vs. Device: Assemblies are testable series of mechanical equipment; devices are not testable. CCS recognizes assemblies, and the plumbing industry recognizes devices. The CCS and plumbing inspectors conduct joint inspections of new construction and changes of use. During these inspections, they determine the type of backflow assemblies or devices required based on the project's specific needs.
The CCS only recognizes assemblies approved by the University of Southern California Foundation for Cross-Connection Control and Hydraulic Research, not devices. Here is a link to the list in an Excel spreadsheet, PDF, and web app. https://fccchr.usc.edu/list.html
- What are common examples of cross connection hazards (sources of contamination) that need to be protected with a backflow preventer?
- Commercial:
- Boiler
- Carbonation Equipment
- Dental Equipment
- Etching Tanks
- Film Processors
- Fire Systems
- X-Ray Machines
- Residential:
- Auxiliary Water Supply (Wells)
- Boiler
- Fire Sprinkler System
- Hose Bibs/Garden Hose
- Hot Tubs/Spas
- Lawn Irrigation Systems
- Swimming Pools
Note: Toilets and sinks have an air gap for backflow protection.
- Why are backflow preventers necessary?
All it takes for backflow conditions to occur is a drop in line pressure in the water main, which can happen due to use of hydrants, water main breaks, high usage or backpressure. In America, we all assume when we turn the tap on that we have safe drinking water. This is a luxury we enjoy, but not without very strong regulations and considerable expense. Our drinking water is among the safest in the world. Water protection and conservation requires the effort and cooperation of everyone, which is why we require and enforce the Cross Connection and Backflow regulations.
- What is the legal basis for Lynnwood's Cross Connection Control program?
The Safe Drinking Water Act of 1986, and Washington State Administrative Code (WAC 246-290-490) requires the Water District to administer a Cross Connection Control Program that will protect the drinking water supply, and to coordinate with the Local Authorities that protect the drinking water supply from possible backflow hazards within the plumbing system of buildings.
- What are types of backflow protection?
- An Approved Air Gap Separation
- Mechanical Assemblies used in the prevention of backflow are separated into three types:
- Double Check Valve Assemblies (DCVA), including Double Check Detector Check (DCDA)
- Pressure Vacuum Breaker Assemblies (PVBA) and Spill-Resistant Pressure Breaker Assemblies (SVBA)
- Reduced Pressure Backflow Assemblies (RPBA) including Reduced Pressure Detector Assemblies (RPDA)
- Mechanical Devices used in the prevention of backflow include:
- Dual Check Backflow Preventer
- Dual Check with Atmospheric Vent, also known as a Backflow Preventer with Intermediate vent
- Hose Bib Vacuum Breaker device (HBVB), also known as a Hose Connection Vacuum Breaker
- Residential Meter Check
- Atmospheric Vacuum Breaker (AVB)
Do I currently have adequate backflow protection? How can I check?
If you have questions about your home or building, contact the City of Lynnwood Development & Business Services at 20816 44th Ave W, Ste 230, 98036, phone 425-670-5400, or the Water Quality Specialist at 425-670-5273.
- Who can test the backflow assembly?
To test backflow assemblies in the State of Washington a person must have a Washington State Department of Health Certification as a Backflow Assembly Tester (BAT). Check out our list here - Backflow-Assembly-Tester-List.pdf(PDF, 68KB)
How often does my backflow assembly need to be tested?
New backflow assemblies require testing once they are installed, annually after installation, after repairs, replacement, relocation, and after a backflow incident. This regular testing schedule ensures the safety and reliability of our water system, providing you with the confidence that the system is well-maintained.
What to do if my backflow assembly fails the annual test?
Either (1) We did not receive your test reports, (2) your test failed, and we have not received the repaired/retested reports, (3) your testing company did not submit current BAT documentation and test kit calibration to City of Lynnwood and is not presently registered for testing in Lynnwood, which will render your tests INCOMPLETE and unacceptable. Contact a certified Backflow Assembly Tester (BAT) to inspect and repair your backflow assembly. Here is a link to verify if your BAT is certified with Washington Certification Services.