I just had my septic tank pumped out but now when I use the washing machine, my toilet starts to bubble and water is backing up in the shower. What could be the problem?

A lot of times it is simply a vent problem. Either clogged or not installed properly.

Hi Sarnett

Sounds like the main drain line is partially plugged up. This could be a coincidence not connected to the pumping of the tank, or it could be as a direct result of pumping the tank and something getting stuck up inside the tank inlet piping... maybe?

Either way, sounds like you need to snake the main drain from the septic tank inlet toward the house, or snake the main drain from the house to the tank... may even want to call the septic guy and see if he can/wants to help here!

Mark