I wouldn't pump it if you know a big rain is coming.

We lived in our house in Trussville for 25 years and never pumped the tank. Most of the time we had 5 people living there. Minimum of 2 women. (Lots of flushes and lots of toilet paper.)

Up here at the cabin it's only been the two of us. When it rains really hard for a few days, the toilet upstairs starts to gurgle. It worries me.