Impact fees are one-time charges that are applied to new residential developments by local governments that are seeking funds to pay for the construction or expansion of public facilities, such as water and sewer systems, schools, libraries, and parks and recreation facilities. In the face of taxpayer revolts against increases in property taxes, impact fees are used increasingly by local governments throughout the U.S. to finance construction or improvement of their infrastructure. Recent estimates suggest that 60 percent of all American cities with over 25,000 residents use some form of impact fees. In California, it is estimated that 90 percent of such cities impose impact fees.