Commercial accounts are charged both a tap and impact fee based on meter size. In most cases, an irrigation meter can be very cost effective because commercial accounts are charged wastewater based on 100 percent of their water use fees. Tap and Ipact Fees cover the cost for the Charleston Water System distribution system to install and connect the new meter. A $35 account origination fee is also charged for creation of the new account. This fee is nonrefundable and nontransferable. It is important to note that irrigation accounts require installation of a backflow prevention device. These devices must be tested annually by an approved tester. A plumber or contractor can install a backflow preventer for you. The cost will be determined by the type of device required and the installation labor. Annual testing fees vary, so it’s a good idea to call around for pricing, but be sure to use a Charleston Water System approved tester.