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Helpful Resources

Backflow and Cross Connection
 

Cross Connection Control: Backflow Prevention, Installation, and Testing

If your home or business has any of the following...

 

  • Fire Sprinkler system

  • Lawn irrigation system

  • Swimming pool

  • Hot tub / jacuzzi tub

  • Livestock watering system

  • Decorative fountain

  • Hydraulic boat lift

  • Water makeup lines (to supply a boiler or hydronic heating)

  • OR if you are a business of (most) any kind

  • OR if you raise farm animals...

 

...Washington State Department of Health requires you to:

 

  1. Have a “Backflow Prevention Assembly" installed on your water service;

  2. Get it tested annually by a certified backflow assembly tester; and

  3. Have your tester send a copy of the test record to Coal Creek Utility District.

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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. 

  • 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.

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Should you have any questions, feel free to give us a call at (425) 235-9200.

Hours

Monday - Thursday
8:00 am - 4:30 pm

 

Friday
7:00 am - 3:30 pm

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Our office is closed on all major holidays including the day after Thanksgiving, and December 24.

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Coal Creek Utility District
(425) 235-9200

6801 132nd Place SE

Newcastle, WA 98059​

©2025 by Coal Creek Utility District, all rights reserved

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