I have water mostly under my driver front side floorboards. There is some water under the passenger side but only about 1/4 of what is on the driver side. I am not sure where the water could be coming from. I have pulled back the floor mats but can determine where the water is coming from. I appreciate any help.

If you have a sunroof it could be the drain that follows the front pillar letting out under the front fender. These hoses are known to plug and crack open releasing water into the floorboards.

Driver side door check along top and front edge for tears or twisted looses sections. Internal to the door water can drain down along the window and is released outside the door seal. If the bottom of the door has the opening that releases the water plugged then water will drain over into the floorboard.

Check under the hood along the firewall, below the windshield around ac evap. and drain area. This is a common place for water to enter and flow by various means (duct system) to passenger rear floorboard as well as slight passenger side front...but usually noticed in passenger rear floorboard.

CHECK SUNROOF DRAIN

a couple things to look at if it has a sunroof the sun roof would have drain hoses that run down in each corner next you need to look at the cowl this is the section in front of the windshield that has a drain on it as well if you find nothing there the next step would be to remove the seats and carpet and sit in the car while running water over it either way you should remove the carpet and make sure it is dry all the way threw or mold will start to grow and you will never get ride of it not good for your heath other key spots to look at is if the windshield was ever replaced it could be a poor seal

no it will most likely be a blocked drain pipe that goes into the engine bay from the A/C and drains the condensation created by your car's air conditioner. A mechanic workshop can do a blast of compressed air by your mechanic and free the blockage takes about 30 seconds to do with a car hoist.
If it is humid conditions the problem will be much more and you might find the front demister won't work due to water sitting on top of the Air conditioner. It will heat this water and blow steam on your window.

I agree but just wanting you to understand a little better... If you park under trees with leaves or pine straw that's what it is...It's around your windshield arm openings.. Leaves and pine straw will fall into the holes and clog up small drain hole intended to drain water from when it rains. leaves and pine straw enters the space it clogs up a little rubber drain hose. Water starts to fill up the area and when it gets high enough it will soak through the paper filter and fall on the floor to the passenger side floor board. Take the vent cover off around the windshield wipers.. usually plastic..After you have them off you will see the paper filter down in the area...The water is not draining properly and water is going through that filter and falling onto the passenger side floorboard. Try to get as much Leaves or pine straw out. Then a long skinny screw driver or wire and push it down..It will fall down under your car..You can find the little rubber hose under the car and Push up...But make sure it's clear...Pour some water in there and make sure it's draining before putting back together...also make sure that air filter is ok also...That's where your heater and AC air comes in at...

The rear ac evaporator box is not draining very well,and it is blowing the condensation up threw the vents,most likely.The drain should be under the rear passengers side wheel well.

is it only when the ac is on? there is a pan under the ac unit that has a hole in it to allow the condensation to empty. if that hole gets plugged it could cause the condensation to build up and back into the inside of that car. i unplugged mine and floor stayed dry

The drain for your A/C may be clogged causing the water to accumulate. You should be able to locate the drain from under the vehicle on the pasenger side, perhaps there is an accumulation of debri such as leaves for example. Also, sunroof drain may also be blocked. I can say I have seen this problem before, and its a good place to start. Good luck

its usually underneath the car.