The fact it happens to be near the door and doors are about 1k times more likly to alow water to enter,I say there is nothing wrong with your foundation. The professional you are looking for specializes in weatherproofing.

The threshold may need some caulking. It would seem water is coming in under the door. It could be running down from or migrating from another area that needs attention too. There are also weather strips for the bottom of the door that might help to deflect it. In the next storm, pull the carpet back to see where the water is coming from. I think it is wise for you to research this yourself before the new floor gets ruined.

I have occasionally found that a builder has used plywood as a spacer between the slab and the threshold. Over time the plywood rots out to where water easily enters under the threshold.
I'd suspect that the threshold needs to be removed a reinstalled properly. Without that, caulking and deflectors would eventually let in enough water to spoil the new wood flooring.
JMHO

Great information, thank you everyone. Guess I'll have to pull up the carpet and take a look and then call a professional! I feared the worst but you all have me a little reassured, thanks.

I just did this repair on a sliding door. Caulk has no part. The first order of business is removing the side jambs, then the threshold. Grind the concrete to level as pictured.

I adhered uncured rubber EPDM with contact cement to the concrete, leaving a large enough flap to return up the back of the threshold and up the jambs where it will be contact cemented in place.

There is no caulk between the uncured rubber and the metal threshold; you want any water blown in to evacuate. No water can get past 6" of contact cement and an inch or more above the threshold and jambs.

DO NOT CUT THE EPDM AT CORNERS! Fold it only.

I didn't have flooding, just some moisture seepage. My guy said it needed the seam along the threshold caulked.

I think you need to pull back the carpet and watch what happens, see where that much water is coming from.

Caulk is not flashing. Thresholds need to be in pans, whether plastic, rubber or copper.

I believe the op is hireing a professional to look at his problem. The possibilities why a doorway leaks are endless but it appears the one that was fixed with EPDM is probibly improper concrete trasnition at door. It looks like the porch/patio was poured after the house was built. The add on concrete should have been at least 1" lower than origional slab. That's a nice job with the EPDM and should stop water getting under the door. I hope the bottom wall plate isn't getting wet elsewhere.

klem 1:

Good points, but the pictured repair was a 2nd story condo. The ground concrete is actually about 2" or so higher than the patio floor although it doesn't appear to be in the pictures.

I'm in CA. too I used to get a little rain in my kitchen couple of times a year but not rest of time & just put a towel down, couldn't figure it out & then 1 day it was beating against the door so hard, I opened it & it seemed like it was raining sideways(wind was so strong). Knowing the problem since almost all storms blew from opposite direction causing no problems, I made habit of checking to see direction of rain & if I had to be gone laid down a thick towel.(This was a new house on concrete slab. )I finally decided to get a metal awning as sun beat on kitchen side most of day. I discovered it keeps any rain from coming in the house. So that solved my problem.