Partially clogged drain line.
Probably the drain hose from the dishwasher isn't high enough to keep the water from running back . The hose should be above the level of the disposal at some point. Some states require an "air gap" which is a device that is placed in the drain line to prevent this. Some states require a simple high loop in the drain hose. Many dishwasher manufacturers are now installing backflow preventers in the dishwasher.
Out the front? the door seal is bad or a retainer screw is missing from the bottom floor trim plates left or right side that go into the tub water table.
The left side.
Prior to caulking the lead joint I use a level then pour the joint and tap each side of the lead so the drain does not shift then finish packing the lead and trim the lead with a trimming iron...same as for CI roof drains except roof drains are slightly counter sunk to allow for the 4 PSF sheet lead flashing
You can get a back water valve. It is similar to a check vale/ the back water valve goes on your main sewer line out side of home. It is desined to stop black water form coming into your home if main line stops up. Thay do make a device that can be installed into an exsisting drain it lets water through your drain but will not let water back up through you shower drain.
Yes the outlet for the dishwasher should be on the same side as the disposal,so the disposal can handle the waste water from the dishwasher.
I've read in several places that pouring vinegar down the dishwasher drain (a lot) and then running the empty dishwasher will kill the ants and keep them from coming back.
The lake that drains on the west side into the Atlantic and drains on the east side into the Pacific is ISA LAKE.
The lake that drains its' west side to the Atlantic and the east side drains to the Pacific is ISA LAKE on the Continental Divide.
The disposal is clogged or that side of the sink is.
Sunroof drains are clogged.
It is normal for dishwashes to discharge below the sink into the "S bend" (otherwise called the trap) this trap is there to stop the smell from the drain coming into the house. Often there is a spigot on the trap onto which the hose from the dishwasher fits, so if this is how yours is done you will find a roughly 20mm hose under your sink coming from the direction of the dishwasher and going into the side of the sink trap, also you will hear the waste water discharging into the trap as the dishwasher cycles.
There are 3-4 drains on the under side of the frame on each side. These can become clogged from leaves and mud and other things. When they get clogged water cannot escape and can enter the cabin. Clear these drains and water will come out of the frame. I used a thin nail and a plastic zip tie.
Isa lake
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Yes. Your dishwasher discharge hose is probably hooked into the side of the disposal. Running your disposal will not hurt the dishwasher.
Most common is a center drain, but it can be at either side depending on where the drain goes into the wall. On the side closest to the dishwasher, the tail piece directly under the sink has a smaller tube in the side of it for the dishwasher drain.