For now stop flushing anything other than human waste down the toilets. You most likely have a big belly somewhere full of fat. I would try to flush with your hose from the clean outs and snake from there too. Call the city and see if they can flush the main line or at least clean out your service line up to where they can to rule out it being their responsibility. Sometimes if you plead your case they will help you out and go up your service more than they should to help with the problem. Ultimately you need to have the line inspected with a camera to determine where the back up is. How old is the house?
BootRacer t1_itb0ys1 wrote
Reply to Massive clog of waste in the line has all drains in the house backing up, what should I do? by Caprine-Evisc
For now stop flushing anything other than human waste down the toilets. You most likely have a big belly somewhere full of fat. I would try to flush with your hose from the clean outs and snake from there too. Call the city and see if they can flush the main line or at least clean out your service line up to where they can to rule out it being their responsibility. Sometimes if you plead your case they will help you out and go up your service more than they should to help with the problem. Ultimately you need to have the line inspected with a camera to determine where the back up is. How old is the house?