120Water is a software company based in the United States, founded in 2016, that specializes in business intelligence solutions for the water industry. With a workforce of between 51 and 200 employees, the company focuses on providing tools and methodologies to assist public water systems (PWS) in managing and evaluating service line inventories, particularly concerning the identification of lead service lines. The company’s published documents include guidance on statistical approaches for service line inventory, which allows PWS to assess unknown service lines without the need for exhaustive physical inspections. This method emphasizes the importance of statistical confidence and the use of randomly generated samples to verify service line materials, ensuring a reliable inventory that informs public health planning and compliance. The documents reflect a commitment to enhancing the reliability and completeness of service line records, thereby supporting water systems in their efforts to safeguard public health and manage water quality effectively.