The overhead florescent light wasn't on.
Upon further examination, I found the buzzing to be coming from the breaker panel. As a quick reaction, I turned off the wall switch powering the pool pump. What do you know?
The buzzing stopped.
I turned the wall switch back on, and the buzzing at the breaker returned.
What would make a breaker buzz? I've never had a breaker do this before. The breaker is only about two months old.
It is a single 15-amp GE standard 3/4"
Thank you for your time.