Water on passenger side floor of Buick Regal

Question edited for clarity, add maker.
Question moved to model category.

Based on our research the RAV4s with wet floors are usually, but not always, clogged sunroof drains or drain outlets. Other RAV4 owners found that the body trim surrounding their windshield or even the fender panel had degraded and failed, allowing water to seep in during heavy rain.
Aug 12, 2015

If the passenger floor of your RAV4 is wet - here is the fix

Torque News https://www.torquenews.com > if-passenger-floor-your-r...

Wet Passenger Floor

Toyota RAV4 Forums https://www.rav4world.com > ... > 4.3 Mechanical
Sep 26, 2015 - After a few years, some foam will start to stiffen up and allowing water to seep past them allowing the water to pool around the opening.

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If it has A/C the drain hose could be blocked and if no A/C it could be a leaking windscreen seal.

look for the highest wet point behind the dash, chances are its the windscreen seal

windshield leaks,hood seal is bad,

have you checked for holes in the floor. the shock towers rust on those. I had a 1995 that had rust in the truck floor next to the rear seat

when the rain fall , or not , first what kind of water , explain

there may be some body rust around the window seal or in the air intake area, depending on your climate, condensation can sometimes drip of the AC system onto your feet

Engine coolant will feel oily and the windshield will fog up and the car will stink. If it is just water it could be coming from the passenger door weatherstrip at top. The ac drain tube , if stopped up will also leak water in the floorboard.

Sounds like the drain for your heater case is blocked, there is a small drain tube on the engine side of the firewall on the passenger side, you can shine a light down there and poke a screw diver in it or just pull the elbow right off and it should take care of it.

it is coming in through the cabin air filter