Might be a little long but trying to give context.
Moved in a basement apartment 5 years ago. When I moved on, a HORRENDOUS disgusting awful puke-inducing sewagey smell would come our of my laundry room, which is attached to my bedroom. Would fill the whole house. I tried to seal off that room. Reported to maintenance and they said they'd call someone to replace a sump pump. After I came home that day it smelled like bubblegum and sewage. Never really got a resolution, but some guys came in an caulked over this pit (pic #1) in the laundry room. Helped a little.
Over the past 5 years, it wasn't as bad as it originally was, but every once in a while a really foul odor would come out of that room.
Another time when I got really bad, they caulked over that thing again. Mostly helped, made it livable.
Now it started agin- started noticing it in the room under the stairs (pic #2) a little, then from our laundry room again, then also from the upstairs laundry room, while is right at the top or the stairs between upstairs/basement.
It has gotten to the point where we can't be in the house even with the windows open. I have nearly puked, and felt so sick it ruins my day.
Does anyone know what the issue is? They've never said what they think it is, they just keep caulking over that spot. I know nothing about plumbing. Here's what I will say because I looked it up and tried this many times - it doesn't seem to be a dry trap. I've tried many times to run water in the sink in the laundry room and it didn't stop the smell. It seems to come from that pit.
Does anyone have any ideas? These maintenance people blow me off so badly about everything, and I know nothing about plumbing to be able to even suggest things to them.