water in driver's side floorboards

Whenever it rains, I get water on the driver's side floorboards. I cannot locate wheree the water is coming in. At first I thought I had a leak along the window, however the seal was still tight.

My sister has a Chevy Z71, which sits in the driveway most of the time and she has also noticed water in the driver's side floorboard as well.

Has anyone else noticed & solved this problem??? Thank you!!!

time to use the garden hose method to find where it's coming in. might be window seals or door weatherstripping, windshield, back window. check the door pins& bushings for wear. open the door and try to lift it up and down at the back. door might be sagging too much to seal. what year is your truck??? the door pins on the new body style always seem to work loose. good luck!!

My Tahoe is a 1999

I would check another area besides the door. I noticed the other day that I was getting some wet areas and staining in my passenger side floorboard. Well, I looked under the dash and saw some rust trails on the impact bar behind the dash. Im assuming that whoever put in the new windshield did a shitty job. I fixed a leak before that was running down the windshield from the top. That was easy, but now I think there is another leak from the base of the windshield or from around the cowl panel somewhere. Im guessing Im going to have to dish out the cash to have my entire windshield reinstalled to clear up some old mistakes by the previous owner.

I am having water in the passengers side. I noticed a line appear next to the passeger seat and door. I thought it was oil at first. It is mold!! I shampooed and extracted, let fan dry overnight and it dried completely. Now the water is back. We flushed the line, it is garage kept from the rain, so I am lost.