[masraum]

Originally Posted by oldE

Is the sinks which won't drain upstream of the toilet?
Could be a mass (or mess) between the toilet and the line going to the septic tank.
It might be easiest to pop the toilet off and see if you can clear the blockage from there.
Best
Les

Originally Posted by Jolly Amaranto

So where are you running your snake from. I see a cleanout in one of the photos where the arrow is. If that line is clear, then maybe the blockage is in the line with the X.

Everything that's red is clogged (and flushing an upstairs toilet caused backup into the tub yesterday). And I've run the snake the path of the blue line, so it's gone from the downstairs toilet to the septic tank. I've actually seen the snake in the septic tank.

Yes, it was very rainy and wet. But I'd assume that if the tank isn't full over the top of the inlet pipe, that I should still have water draining into the tank, right?