How to deter earthworms from entering house?

Every time it rains enough and the backyard water level is high enough, I wake up and there are earthworms all over the kitchen (adjacent to the backdoor). Now, they don't do anything but die by the time I wake up in the morning, but it is damn annoying. We had a bad rainstorm just now here in Oxford and there must be 15 or so squiggling on the kitchen floor now...theyll be dead tomorrow. Any ideas on how to prevent it? My house is kind of low-elevated in companion to the rest of the neighborhood and my backyard fence borders the woods.