Helpful Resources
Backflow and Cross Connection
Cross Connection Control: Backflow Prevention, Installation, and Testing
If your home or business has any of the following...
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Fire Sprinkler system
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Lawn irrigation system
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Swimming pool
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Hot tub / jacuzzi tub
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Livestock watering system
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Decorative fountain
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Hydraulic boat lift
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Water makeup lines (to supply a boiler or hydronic heating)
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OR if you are a business of (most) any kind
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OR if you raise farm animals...
...Washington State Department of Health requires you to:
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Have a “Backflow Prevention Assembly" installed on your water service;
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Get it tested annually by a certified backflow assembly tester; and
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Have your tester send a copy of the test record to Coal Creek Utility District.
What is a Cross Connection?
A cross connection is a point in a plumbing system where the potable water supply is connected to a non-potable source. If a "backflow" occurs, pollutants or contaminants can enter the drinking water system through uncontrolled cross connections. There are two types of backflow risks:
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Back-siphonage: this is caused by a negative pressure in the supply line to a facility or plumbing fixture. Backsiphonage may occur during waterline breaks, when repairs are made to the waterlines, or when shutting off the water supply.
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Back-pressure: this can occur when the potable water supply is connected to another system operating at a higher pressure, or a system that has the ability to create pressure, such as a booster pump, pressure vessel, or elevated plumbing.
How Do We Prevent Cross Connection?
Water safety is a two-way street. If you have any of the items listed, a mechanical backflow prevention device can prevent backflow from cross connections. However they must be properly installed and regularly inspected to protect effectively.
Should you have any questions, feel free to give us a call at (425) 235-9200.