Water leak noticed by downstairs neighbors ceiling (condos, Home Depot)

[Pacific Quinn]

My situation: moved into 2nd floor condo in 2019 (building built 1965), the former owner remodeled kitchen and bathroom flooring (not professional), yesterday downstairs neighbor alerted me to water dripping from their ceiling fan. Which stopped after I turned off the water to my toilet. The only evidence to a leak on my floor is that the hallway rug outside of the bathroom was wet. So my questions: how can I tell if the leak is only from a bad wax seal (there's no moisture around toilet base) or could it be from another source? (ie: will I need to take up the floor? Plus, I'm using water from a bucket to "flush", if it is not the wax seal then using a outside source of water should not cause additional leaking for my downstairs neighbor.?) I'm still waiting for the hallway carpet that abuts the bathroom floor to completely dry; so far it's not getting more wet.

[MechAndy]

Act quickly with fans.
Home Depot rents fans just for drying floors.
Black mold is not your friend.

Leak wise are you sure your water shut off valve and water line to the toilet are not leaking?
Did you recently get a new tile floor next to your toilet?
Is there anything else nearby that requires water like a kitchen on the other side of the wall?
Did you employ any contractors recently?

Are you under a homeowner warranty?
This can get expensive real fast.
Good luck to you.

[Diana Holbrook]

If it's a drain line leak, or a bad seal, then flushing with bucket water is not going to help you.

I think it likely you're going to need to open things up. In most condos, you are responsible for water damage below you.

I would stop all use of that bathroom and turn the water off til you can have a plumbing contractor look at it, asap.

[wolfdog]

I note you said it's a condo. In certain situations, your association will pick up the cost of repair.