Water

It might not be rain. The A/C produces condensation water and it has a catch tray and drain to the outside to the ground under the passenger side. That drain may be clogged with leaves and debris. If it doesn't drip outside while running the A/C, the drain is plugged and water must be going on the floor boards.

I have the same problem. Every time it rains i get a puddle on my passenger floor. tons of water coming in. it's ridiculous. company i work for purchased 10 of these vehicles brand new and 5 of them have this problem. it's not a little water coming in, it's a lot like someone left a hose on inside the car. Never buy one of these vehicles.

I have the same thing going on with my 2011 Chevy Equinox. Water coming in and wetting up passenger side floor. I also see water near the top of the door

Wow. Maybe it's not the A/C. That much water has to be a door seal or something missing. I would carefully drill a tiny drain hole in the floor board until some genius in Detroit (or wherever) finds a remedy for their design error. It's not like it's the first one they ever built, like Henry Ford.

2016 lTZ AWD water front and back. No longer under warranty and extended does not cover

I have a 2019 Equinox, i get a puddle on the driver's side when it rains heavy. This is the 2nd time this has happened. Just made an appointment with the dealership. This is so bizzare

Do you live in Ohio