In 2001, the Village of Norridge switched from manual water meter readers to an automatic meter reading system that sends usage information through a secure, long range wireless network. Each meter has a module called a Meter Transmission Unit (MTU) that reads each water meter and forwards the meter usage data to the Data Collector Units (DCU). The DCUs receive, process, and store all the information from the MTUs, then forward the information to a Network Control Computer at Village Hall. This allows the Village staff to run reports and create water bills using the information gathered. Eventually, the MTUs have to be replaced and one of the indicators is if the unit had not read for prolonged period of time. The Village of Norridge wanted a way to map out which MTU units had not read for a period longer than five days, so that they could start to keep an eye on them to see if they would eventually re-sync, or would have to be replaced.