Arthur Davis writes:

Is this a matter of just having the septic tank
pumped out or is this an indication of a problem with the drain field?

Pumping will do *nothing* to correct this trouble. Not clear why so many
people assume this is the first thing to try.

You may have a simple clog in the house or in the tank.

You may have a marginal drainfield that is being overwhelmed by a constant
leak somewhere or recent flooding, but can still handle your normal
household needs. Or it may be failing to the point it won't just keep up.

(From a fellow Floridian.)