My basement flooded recently and I'm trying to determine why.
The basement has poured foundation walls and a slab. The slab is non-structural, and was poured after the foundation walls. There is a tile drainage and sump pump system. It's a new build.
We got some heavy rain that resulted in the basement flooding. Some neighbors who also had flooding, suspect a sewer backup.
The sump pump continued to work during the flooding, but perhaps was overwhelmed. I still see water seeping between the foundation wall and slab, and the slab is discolored where water appears to be seeping up. The water was clear and didn't smell. If the water came from the sewer, I would imagine it would have had to have come from the HVAC condensation drainage.
How can I tell whether the flooding was from a sewer backup or from a failure in the tile drainage/sump system? If there's no way to determine why it flooded before, is there anything I can do to find out if/when it happens next time?