Because the washing machine drains down the same main drain and it's suction as it goes by is trying to suck the water out of the under sink U trap.
drain line is partially clogged.
This is most likely caused by a lack of venting on either your washing machine drain or sink. The gurgling noise you hear is actually air getting drawn through the water in the sinks trap as the washing machine water drains past the sink drain. Both the sink and washing machine should be checked for venting issues by a licensed plumber.
The shower gurgles because the water is going down the pipes.
Your toilet gurgles when the washer drains because there is a blockage or restriction in the plumbing system, causing air to be sucked in through the toilet's trap. This can create a gurgling sound as the water drains from the washer.
The sink gurgles when the water drains because air is being pushed through the pipes along with the water, creating a bubbling or gurgling sound.
The drain is plugged somewhat between the upstairs and downstairs. Need to snake the drains.
Someone connected a storm line to a saniraty or visa vera
Gurgle is a noun (a gurgle) and a verb (to gurgle).
The vent pipe could be clogged. The vent pipe is that pipe that pokes out of the roof, there will probably be several. You may be able to clear the blockage by running a garden hose down the pipe (start by picking the pipe nearest the sink area) and turning it on to full blast.
They gurgle because of the sudden release of air. You have this gurgle because your vent pipes are either stopped up, in the wrong place, or are iadequate in size. When you drain water the you put pressure on the air in the drain lines. This pressure is actually sewage gas and should go out through your vent stack(s). You will need to repair or reppace your vents for this problem to be corrected.
Your kitchen sink may gurgle due to a clog in the drain or vent system, causing air to be trapped and released when water flows. To fix it, try using a plunger or drain cleaner to remove the clog. If the issue persists, you may need to call a plumber to inspect and repair the vent system.
your drains are probably on the same waste line. by upc code your waste line should tie into your main sewer line 6 feet from any horizontal to vertical change in direction. this is due to the fact that the sudds from your washer can actually go up your drain line. It is possible you have a non functioning vent. The heavy flow of water into the wast line from the washer can be causing air to enter into the wast line from the kitchen waist line. Gurgle sounds come from the air pulling through a trap serving the kitchen sink. If you live in a very old house you may not have a vent at all or you may have a vent line run in steel pipe. Scale and rust can dislodge and fall down into the vent line and plug it up. An undersized vent or if in winter an iced up vent can cause the same problem. David A partial block in the mainline sewer can also cause this. Find your clean out and watch when your washer drains. If you see it backup at all, you've got to get it cleaned out.