We have a problem with fire ants. They bite us at night while sleeping, on the couch while reading or watching TV, and in the yard while we work. I’ve been looking for non toxic ways to deal with the situation, and found the following:
Windex/Ivory Soap (not organic, but non-toxic to humans)
Shakley’s Basic H
and much more (see http://www.thefrugallife.com/ants.html). Different types of ants are attracted to / repelled by different things, so experiment. When you find their entrances into the home, caulk!