Ants and pest control

We have had MAJOR ant problems at our house for the last month or so. We tried baking soda, vinegar, vacuuming and sweeping constantly and nothing had worked so we finally resorted to calling a professional exterminator.
Luckily, there was a organic option (rosemary oil) that they were able to use and so far so good. The ants have virtually disappeared.
We used Sonoma Valley Pest Control (a local business) which had the organic rosemary option for spraying. It was 75.00 more than the "not so eco friendly" treatment cost but it seemed worth it. Especially if it works. We will see......
Another company that we looked into but wasn't able to come out as fast as we needed them to is bio-pest (bio-pest.com) which also uses the least toxic methods for pest extermination and also claims to use only cars in their fleet that get 35 mph or better. There website is interesting if you want to take a look.
I will keep you posted on our success with the rosemary treatment.