Well in 1938 the local power company in Southern California thought Amateur Radio (HAM) was the solution.
https://w6sce.org/about-w6sce
The flood that disrupted communications,
https://en.wikipedia.org/wiki/Los_Angeles_flood_of_1938
We have come a long way since 1938, a lot of options now, I like having HAM equipment and knowing how to use it.
More realistic is the "Big One" Earthquake, most/all communications will be disrupted due to overload, but the radio will work, since so few use it anymore..