Where protection lives
Car washes
Recirculated wash water, detergents and wax systems sit directly on pressurized water connections.
The protection you will typically see
High-hazard protection at the equipment and often containment at the meter.
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
Wash equipment vendors plumb fast; the water authority checks later. A pre-opening conversation with the authority beats a correction notice after.
Common questions
Why do car washes need backflow protection?
Recirculated wash water, detergents and wax systems sit directly on pressurized water connections.
What kind of backflow preventer is used?
High-hazard protection at the equipment and often containment at the meter. 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
| Pools, spas and fountains |
| Garden hoses and hose bibbs |
| Homes with wells or auxiliary water |
| Food and beverage processing |
| Commercial buildings generally |
| Lawn irrigation systems |
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