In grade school where I was raised there was a siren, among many throughout the city, that wailed every Tuesday at noon. It was part of the Emergency Alert System practiced in case of nuclear attack. It was the most efficient method to quickly alert the most people at once.
Here in the outlying rural country areas, radio reception can be marginal, cell phones are not reliable and landlines, major prey to solicitors, are rarely answered in person. Some would prefer neither, that is, until an emergency develops. Sirens would alert all but the soundest sleepers.
These days, wildfire would be more likely than nuclear attack, but I wonder if the primitive alert system could be easily installed and implemented and perform more reliably than any other. I also wonder if PG&E would provide the hardware, power and service as part of their remediation efforts to their customers. The benefits to all seem obvious.