Pacific Gas & Electric will resume annual maintenance on the early-warning system sirens in San Luis Obispo County this week.
Starting Wednesday, each of the 131 sirens will be inspected and tested individually. PG&E representatives say this is done to ensure the system is ready in case the sirens are needed during an emergency.
The short, low-volume test will only last for a few seconds, according to PG&E. No action is required on the part of the public.
In the event of an emergency, the sirens would sound for three minutes.
Maintenance work on the sirens will be done weekdays from 8 a.m. to 4 p.m. through July.