What is a cross-connection?
A cross-connection is any actual or potential physical connection between a public water system and any source of non-potable liquid, solid, or gas that could contaminate the potable water supply by backflow.
What is backflow?
Backflow is the undesirable reversal of flow of water or other substances through a cross-connection into the public water system.
How can we prevent backflow?
The solution to preventing backflow is simple: install an approved backflow prevention assembly on potentially hazardous corss-connections. Washington State Department of Health requires, at a minimum, a Double Check Valve Assembly on all irrigation systems. For a list of approved backflow prevention assemblies, click here.
Why do I need to have my backflow assembly tested?
The Washington State Department of Health currently requires annual testing to ensure your assembly is function properly, and not in need of repair or replacement. Lake Josephine provides this service at a cost of $40 per test. If you wish to use an outside source for your annual backflow test, a list of certified Backflow Assembly Testers can be viewed here.
Proper Installation of a Reduced Pressure Backflow Assembly
Proper Installation of a Double Check Valve Assembly