Efflorescence garage floor

[Redmeatryan]

Seeing some efflorescence and minor spalling of concrete floor in garage just before threshold to home hallway. Slab foundation and it’s been dry all summer. The irrigation runs 2x per week but area is away from landscaping. Should I worry about subslab plumbing leak?

 

[Snoonyb]

Welcome.
Plumbing leaks in a slab foundation are always a concern, but they are not prevalent.

It could also occur from an extremely hot garage, and a cool house.

If you feel this is something you need to track, as in the frequency of events or an appliance being used, such as a clothes washer. Such events can lead in the process of elimination.