
Please advise re: sewer flies in my office
I have these flies (not my photo) in my office, which was recently renovated. It’s not just my unit because my colleagues have also seen them. They seem to be concentrated at my end, which is nowhere near a drain or bathroom, and I’ve never seen any in the kitchen.
The trash gets taken out every day and a lot of people work from home, so there’s just not a whole lot here. The building was renovated last year, so this is the first spring/summer that we’ve had them, and I just started seeing them around when the AC might have switched on, so I’ve suspected they could be from the HVAC (either the building vents or the wall units in some of the offices) but building maintenance has been by a few times and they say there’s no condensation, it just drains. Maintenance is blaming it on office plants, which I really really doubt - I have never known this type of fly to breed in plants. Can anyone advise??