As explained in our POWDERPOST BEETLE ARTICLE, most all treatments will last a lot longer than one year. Are you sure there is actually any treatment going on or are you really paying for a "contract renewal" of some sort that will cover the cost of a treatment should it be deemed necessary to treat again? I know many companies will offer such annual renewals and most require a good inspection once a year as part of the contract. Find out from the company for sure just what it is they are doing and if you have further questions or concerns, please give us a call on our toll free 1-800-877-7290.