The ICR Laboratory QC Database System is a Personnel Computer (PC) based Microsoft Access runtime application developed to validate data supplied by large water utilities in accordance with the requirements of the Information Collection Rule. The application will help laboratories: Capture batch and result information for Laboratory QC Samples that will be used to validate data submitted to EPA by water utilities; Record and review data required to maintain your status as an approved laboratory under the ICR; (Note: The ICR Laboratory QC Database System will not determine your approval status. However, the application will help you track much of the data you need to report to EPA to maintain that status); and Report QC sample data in the format specified by EPA. The ICR Laboratory QC Databse System is part of the overall ICR Data Management System (DMS), an information system that captures treatment process, water resource, and sample data from large public water systems and validates the data using information reported independently by analytical laboratories. EPA and the drinking water industry will use the data to evaluate the quality of drinking water in the United States, identify the most effective water treatment technologies currently in use, and develop future drinking water regulations.