Water is flowing out the top of the septic tank.
First sign was that ecurbh’s shower wouldn’t drain.
We used a plunger on it and pulled a lot of black sludge up into the tub, the rather slimy stuff that coats the drain pipe, couldn’t clear it.
Called the roto rooter guy who opened the lids on the septic tank and it’s full to overflowing, can’t see the inflow or the outflow to see if it’s clogged with roots or something till it’s pumped.