The Information Collection Rule (ICR), developed by the United States Environmental Protection Agency (EPA) in cooperation with the water industry and environmental groups, requires large public water systems to monitor and report results for microbial contaminants and disinfectant by-products (DBP). It also requires utilities to report treatment plant design and operating data. The software allows users to record and review data required to be reported, verifies that the data are correct, and reports the data in the required format. The purpose of the ICR is to collect information to EPA and the water industry in evaluating monitoring data and treatment removal efficiencies and identify source water parameters related to pathogen occurrence and that influence DBP formation. It is designed to cover a limited time span. Very large utilities, typically those serving over 100,000 people, are required to report data on a monthly basis for 18 months.