Oct 18, 2019 - 10:50 AM
Totally eradicating Formosan termites is possible. If the nests were removed and the house treated properly and completely, then I would guess that there is a good chance they are gone - for now. Depending on which chemical was used will determine to a large extent when they come back. When the chemical wears down or is no longer effective, they will probably return soon after.
In your neck of the woods - the Formosan termite is a constant threat. I would recommend at least an annual inspection by a licensed termite professional. 2 times a year might be better.