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Big thank you to ALL for the suggestions and ideas! Plumber came out yesterday and snaked standpipe, hit some obstruction and couldnt get past it. Then snaked the kitchen sink and hit mud, mud and more mud. So they're scheduled to tunneling tomorrow and reroute the W/D and kitchen drain lines to...

Someone mentioned that the busted water line and the drain line might share the same trench. Perhaps that would explain it. I thought the copper lines were in the slab, and the drain pipes were under the slab, but like i said I know NOTHING about plumbing layouts or basics.

IFIXH20, So the possible failure in drain line is potentially causing super saturation under the slab right near where this copper line is busted and the water is just going up into this pipe (thus coming up out of both ends)...? Is that random coincidence that the drain pipe failure is in such...

IFIXH2O, We just tested it and ran the washer's drain cycle. Water immediately came up both copper pipes (i removed the putty plug on pipe #1 for the experiment). so it is definitely drainage related. We've never had the standpipe overflow, just he kitchen sink back up and then the two mystery...

Caduceus and John, MUCH appreciated. The PEX is from a repair done before we purchased home and is the only PEX line (running through attic to guest bathroom). The first backup incident was just water coming up the kitchen sink. The second incident was kitchen sink AND water coming up pipe #1...

First time post, so go easy on me. The situation: Waste water backs up into our kitchen sink (a couple inches) during washing machine drain cycle, but quickly recedes once the drain cycle ends. Had plumber snake the line twice (once down the standpipe and once from the city cleanout in...