We used the Tri-City folks several times. We have had moles in our yard, which were treated after our initial Home Advisor request. A technician returned a month later to recheck the areas of the yard to see if the moles had been eradicated. The moles seemed to be gone. At the beginning of the next year, the moles were back and we called Tri-City again. They got rid of them again, but the moles returned this past fall. We understand that the moles who don't die can simply move to a more hospitable area, and they might return to our yard eventually. We have been very happy with Tri-City's services and personnel. When we call them they have come out promptly to help us. They are all very personable and helpful. There is a 90 day guarantee on their services.