If you have a drippy hose bib or a puddle that never dries, fix it. Ants need water like I need coffee—constantly. Even a small leak from your sprinkler system can sustain an entire army.
And don’t forget to check your potted plants. Overwater them, and you’re basically running an ant spa. Side note: I’ve learned that ants hate dry environments. Crazy, right? Who knew tiny creatures had such strong opinions about humidity?