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In the past day or so, we've had big black ants coming in the house, particularly in the bathroom. I spent a while watching them, and I coulda swore they were coming out of the drain. I smashed a few of them, and I looked down, and 4 or 5 more were right on top of the drain in the sink.
I poured liquid plumber down the sink, and am waiting to see if more come out. Is it really possible to have them coming up the drain? DW says she thinks they are coming from the drain too. We are on the sewer system, no septic. Any ideas? This is the only place I've seen them so far in the house.