If your vehicle is showing water pooling in floorboards after rain or car wash, here are the most likely causes and the parts you'll need to fix each one.
Debris like dirt and pollen clogs the sunroof drain tubes over time. Rainwater overflows the sunroof track and travels down the interior A-pillars or B-pillars, eventually pooling on the floorboards.
Leaves and pine needles block the drainage area under the windshield cowl. Water backs up, enters the fresh air intake of the HVAC system, and spills out of the heater box onto the passenger floor.
The plastic moisture barrier inside the door panel is torn or wasn't resealed properly after a recent window repair. Water entering the door shell bypasses the bottom drains and leaks into the cabin over the door sill.
The urethane seal around the windshield has failed or was improperly applied during a recent windshield replacement, allowing rainwater to seep down the firewall and under the carpet.