Washing machine, toilet & tub

[silva168]

HELP!!!
Our house is on a Septic system.

THE PROBLEM:
It all started a couple of weeks ago ...When we run the washing machine, the water in the toilet bowl will drain its self out, right after that the toilet bowl drains its self out, as soon as that happens dirty water starts backing in into the bathtub.

ANYBODY FAMILIAR WITH SITUATION??

[HayZee518]

sounds to me like there is no vent in the stack or else it is plugged siphoning water out of the toilet - a blocked trap in the bathtub drain would do something - also could be the connection where the tub drain is - on the water closet bend - possibly a side inlet to the drain causing the grey water to back up.

[Fluk_Fluk]

Thanks, your answer helped me also !

[silva168]

We ran a snake through the vents, but unfortunately that did not fix our problem.

But thank you fo your answer