Jorge Vamos has compiled a list of non-toxic options for repelling ants from inside your house. He suggests finding the ants’ point of entry into the house and placing lemon rinds, baby powder, chalk, peppermint oil, or coffee grounds at that point or around the base of the house to deter the ants from entering. Inside your house, treat the places where you see ant trails with lemon juice, cinnamon, black pepper, chili powder, or cloves. You can also try combinations of more than one of these remedies. See the full article here.