Tacoma Water goes to great lengths to ensure delivery of safe and reliable drinking water to your home. Once the water goes past the meter, however, we rely on you to ensure that it remains safe to drink. That may be an issue if you have an irrigation or fire sprinkler system, or a home boiler installed on your water line. Those additions may cause contaminants to flow to your tap.
Properly installed and maintained backflow prevention assemblies will stop contaminated water from reaching your tap or the water system. Learn how to prevent backflow by avoiding contamination through cross connection, which is any connection between the water system and material that could harm the water system.
- Air gaps
- Reduced pressure backflow assemblies
- Double check valve assemblies
- Pressure vacuum breaker assemblies
- Atmospheric vacuum breakers
The potential hazard indicates the appropriate assembly. In general, we accept air gaps and reduced pressure backflow assemblies for high hazards and double check valve assemblies, pressure vacuum breaker assemblies and atmospheric vacuum breakers for low hazards.
The backflow preventer chosen must be listed on the Washington State Department of Health's Approved Backflow Prevention Assembly List. Assemblies not currently listed must have been listed at the time of original installation.
We inspect assemblies upon installation and conduct periodic re-inspections on all existing assemblies. Assemblies must be tested annually by a State of Washington certified backflow assembly tester. Assemblies must also be tested after any repair or replacement. We require a copy of each test report.