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That is true. He has tested but has not passed yet.

I'm not sure why he is saying that. I suspect it's because he doesn't really know why and is just telling me it's the venting and there isn't anything he can do about it. (in-house plumber)

Thanks for the reply. I'm being told venting is the issue but I felt it was more of a slow drain issue. The problem is I'm not a plumber and the guy telling me it's the vent is a plumber. Thanks again.

Shouldn't a sink be able to take all of the water that is capable of flowing out of the faucets, even if fully opened, without overflowing the sink? The sinks in question are in an old building that has back to back sinks in adjoining rooms.