Thanks. Still doesn't explain why dishwasher doesn't cause water, but sink does. I will have a camera put in, and find it. I appreciate your comment, but find it odd that the same pipe works while using dishwasher, but doesn't when we run water.

Not the pipe. Sink probably leaks at the flange. It’s above where the DW drains into the disposal.

I don't think so. There is no moisture under sink, nor around anything in kitchen. Again, the water seeps thru the concrete in garage floor, which is below kitchen.

I will have a plumber run a camera in the pipe to see what it is.

Your stack gets wet from either. But you only see water when the sink itself is used. Has to be above the DW tie in. As in, is plumbers putty missing under the sink? Around the faucet? Is this an undermount sink losing its silicone seal?

No, I don’t think so. There is no moisture under sink, anywhere, but 10 feet down, and 4 feet across, under my garage floor, water seeps thru concrete into basement floor.

My summit gen stack is exposed, in garage. It’s dry, and bottom part was replaced.

My kitchen stack, not summmit gen. Damn phone!