Cross Connection Control
In compliance with Washington State Administrative Code 246-290-490, which regulates the city’s Cross Connection Control Program, Bellevue Utilities inspects drinking water systems on properties to protect against contamination. We do this by using backflow prevention assemblies.
These assemblies vary in size, shape, value and location; however, they all do the same thing -- they prevent dangerous backflow. Our goal is to protect your drinking water and the city’s drinking water distribution system.
How does backflow happen
The diagram below shows how contaminants can enter the drinking water system without backflow device protections.
Annual backflow test requirement
State law requires all properties with cross-connections - systems connected to the public drinking water system - to install a backflow device and test it annually. This ensure it continues to function property to protect the drinking water supply.
Log-in to our Backflow Assembly Testing Portal to:
- Check the status of your test(s) submittal
- Update your contact information
Send an email to firstname.lastname@example.org to get your access code.
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Frequently Asked Questions
What is Backflow?
What is a Cross Connection?
Where are Cross Connections found?
What causes water to flow backwards?
What are the Dangers Associated with a Cross Connection?
Why was Cross-Connection Control established?
Is there a city ordinance establishing a Cross Connection Control Program?
Why do I have to test my Backflow Assembly annually?
If you have an irrigation system for your yard, boiler, pool/spa, water feature, fire sprinkler system or photo development equipment, state law requires that you get a backflow prevention assembly to prevent contaminated water from flowing back into your drinking water--a serious health hazard. Many businesses are also required to have backflow prevention.
Even the best backflow assembly can fail because of freezing, debris, improper installation and unapproved plumbing connections. That's why state law requires that backflow assemblies be tested annually by a certified backflow assembly tester to ensure that the assemblies will function if there is a backflow event.
What is Premise Isolation?
- Agricultural (farms & dairies)
- Beverage bottling plants
- Car washes
- Chemical plants
- Commercial laundries, dry cleaners
- Premises where both reclaimed water and drinking water are provided
- Film processing plants
- Food processing facilities
- Hospitals, medical centers, nursing homes, veterinary, medical and dental clinics, and blood plasma centers
- Metal plating
- Petroleum processing or storage plants
- Piers and docks
- Radioactive material
- processing plants or nuclear reactors
- Radioactive material processing plants or nuclear reactors
- Survey access denied or restricted
- Wastewater lift stations and plumbing stations
- Wastewater treatment plants
- With lakes, streams, wells, and the city water supply, whether or not interconnected with the potable water supply
Plumbing connections that raise concerns for Backflow Prevention
- Janitor sinks
- Hose bibs (inside and outside garden hose faucets)
- Lawn irrigation systems
- Lake, stream, well water supplies
- Laboratory equipment
- Processing tanks
- Water recirculation systems
- Swimming pools
- Solar heat systems
- Fire sprinkler systems
What are the types of backflow prevention devices?
Pictures are for Illustration purposes only.
DCVA – Double Check Valve Assembly / Protection for lower hazards, such as irrigation systems.
RPBA – Reduced Pressure Backflow Assembly / Protection for high hazards, such as boilers, x-ray machines, soda dispensers, etc.
PVBA – Pressure Vacuum Breaker Assembly / Protection for lower hazards, such as irrigation systems.
Air Gap – An Air Gap is a physical separation between the free flowing discharge end of a potable water supply pipeline and the overflow rim of an open receiving vessel. Protection for high hazards, such as a chemical tank.
- City of Bellevue Cross Connection Control Program
- Backflow Test Form (new or replacement assemblies only)
- Cross Connection Control, Washington State Administrative Code 246-290-490
- Prevalence of Cross-Connections in Household Plumbing
- Summary of Backflow Incidents, Fourth Edition December 1995
- Washington State Department of Health Cross Connection Control
- Foundation for Cross Connection Control and Hydraulic Research
- American Backflow Prevention Association
- United States Environmental Protection Agency Cross Connection Control Manual