What is cross-connection?
NEED TO SCHEDULE A BACKFLOW TEST?
Please note: this list is provided to you as a convenience only and is not comprehensive. The District does not recommend any specific contractor. View the full list of certified backflow testers by county.
- Irrigation Safety and Cross-Contamination flier
To prevent cross-connections from occurring, follow these precautions:
- Never submerge a garden hose in a bucket, sink, or anything else.
- Do not use a spray attachment on your garden hose without first installing a backflow prevention assembly.
- Keep the end of the garden hose clean and free of contaminants.
- Install a backflow prevention assembly on your irrigation system. To install an irrigation system, you must comply with the following requirements:
- Irrigation systems connected to a drinking water system must be equipped with a backflow prevention assembly that has been approved by the Washington State Department of Health; and
- Assemblies must be tested upon installation and annually thereafter by a state certified Backflow Assembly Tester.
Why do I need a backflow assembly?
If you have an irrigation system or fire sprinkler system, Washington State Department of Health requires you protect the connected drinking water system from the potential cross-connection. There are many types of backflow prevention assemblies. They vary in design, function, and price.
If you have questions regarding cross-connection or backflow assemblies, contact (425) 398-4419 or email email@example.com.