Re: gurgling water
I would have to guess the laundry drain is tied into the same drain pipe as the sinks which are gurgling.
If these sinks make a gurgling sound when the washer is draining then likely there is a venting problem .... either blocked or missing altogether.
When something like the washer is discharging a fair amount of water the drain line is trying to vent from wherever it can ..... in this case the sinks. When this happens the water seal .....that is normally in the " P " trap under the sink ..... is being sucked out and allowing sewer gas to enter up through the sink's drain.
Just a thought.
"" an ounce of perception -- a pound of obscure "