Where protection lives
Garden hoses and hose bibbs
A hose left submerged in a bucket, pool or chemical sprayer is the most common cross-connection in any home. Pressure loss on the main can siphon whatever the hose sits in.
The protection you will typically see
Simple hose-connection vacuum breakers on the bibb, the small brass fitting many jurisdictions expect on outdoor faucets.
Who decides
The water authority assigns the required protection by degree of hazard and enforces the test schedule. Requirements vary by jurisdiction; the authority's cross-connection control program is the answer to every "do I have to" question on this page.
What the owner should know
This one is a hardware-store fix, not a tester visit. Screw-on hose bibb vacuum breakers are inexpensive protection for the most common backflow path in residential plumbing.
Common questions
Why do garden hoses and hose bibbs need backflow protection?
A hose left submerged in a bucket, pool or chemical sprayer is the most common cross-connection in any home. Pressure loss on the main can siphon whatever the hose sits in.
What kind of backflow preventer is used?
Simple hose-connection vacuum breakers on the bibb, the small brass fitting many jurisdictions expect on outdoor faucets. The assembly type is assigned by your water authority based on the degree of hazard, not chosen by the property owner.
How often does it get tested?
Testing is typically annual where required, on a schedule set and enforced by the water authority. A certified tester performs the test, tags the assembly, and files the report.
Other places protection lives
| Homes with wells or auxiliary water |
| Food and beverage processing |
| Commercial buildings generally |
| Lawn irrigation systems |
| Fire sprinkler systems |
| Boilers and hydronic heating |
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