Toilet in second bathroom gurgles when running shower/washer on opposite side of house. We have a mound type septic system and have had a plumber snake out the toilet and still have the problem. Septic tank was emptied 1.5 years ago. Any suggestions?

Air intake ( vent ) may be obstructed. Try to snake the vent through the roof stub-out

Milo

Yep agree with Milo, Thanks.

John