Water - As enacted, clarifies that if a point-of-entry treatment device is installed in a facility solely to soften hard water and, because of the installation of such a device, the house, building, or complex of buildings meets the definition of a public water system under the Tennessee Safe Drinking Water Act of 1983, then the facility constitutes a consecutive system, and is required to monitor the influent and finished water for hardness, alkalinity, and pH on a quarterly basis, and sodium on an annual basis, and report the results to the department of environment and conservation within 15 days of the end of the reporting period. - Amends TCA Title 68.

SB 258 clarifies that facilities installing only water softening devices (for hard water) do not become public water systems under Tennessee law, even if the device causes them to meet the definition. It specifically excludes such softening systems from public water system requirements, meaning these facilities are not required to monitor water quality unless they otherwise qualify as a public water system. If a softening system causes a facility to meet the public water system definition, it must monitor hardness, alkalinity, pH quarterly and sodium annually, reporting results to the Department of Environment and Conservation within 15 days of each quarter. The bill amends Tennessee Code Annotated Title 68 and takes effect July 1, 2025.