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When you find those dreaded ant hills, there's a cheap and sure way to get to them all, even the queen. Boil a large pot boiling water and pour it directly on the hill. Pay more attention to the ones closest to you house first, then work your way out. Use plenty of boiling water to make sure you get the queen too.
I try to get rid of ants at the source. If you find an ant hill, pour boiling water on it. It's nontoxic to other animals and gets them before they get into the house.