Recently I had the O-rings replaced under warranty because of coolant seepage in the passenger side footwell. Now I have water onlyleaking in the driver's side footwell that isn't leaking from under the dash but I don't know where the source is. Is this just the A/C not draining properly?

 

Easy check for AC drains, just get a flash light and inspect the drain hose located about where the carpet meets the foot vent, you might have to pull the carpet down a little. The AC drain hose is a soft rubber hose that is easly dislodged or kinked.
another sorce of water into the drivers side is the sunroof drain hose. it runs from the roof ,down the A pillar and through the LS body kick panel.
Test the drains with a small cup of water, open the roof and pour the water in the corner area of the roof tray, the water should get to the floor fairly fast behind the LF wheel . If the water aint there its now on your floor, more work here to find the problem , you might need to loosen the headliner to inspect the routing etc

 

Thanks sooo much!! I'll look into this.