The Environmental Protection Agency’s (EPA) 2021 Lead and Copper Rule Revisions (LCRR) required water systems to complete comprehensive Lead Service Line Inventories by October 16, 2024. In Tennessee, these inventories must include material details for all service connections within the distribution system, regardless of size or water usage type. This initiative has posed significant challenges, particularly for small and resource-constrained systems. On October 8, 2024, the EPA finalized the Lead and Copper Rule Improvements (LCRI), which retained the requirement for service line inventories but introduced additional compliance mandates, including the removal of all lead service lines within 10 years. Systems must now comply with LCRI deadlines, including submitting a new baseline inventory by November 2027. With the introduction of the LCRI, utilities face additional challenges such as the validation of non-lead service lines, implementation of updated compliance sampling protocols, and identification of unknown service line materials by 2037. This session will provide a roadmap for directing systems’ current efforts to meet long-term compliance goals and addressing regulatory requirements. This presentation will highlight lessons learned from Tennessee water systems that successfully completed initial inventories under the LCRR. It will also offer strategies and best practices for utilities striving to meet LCRI requirements, particularly those who missed the October 2024 deadline for initial submissions. Key topics will include effective approaches to inventory development, stakeholder engagement, data management, and strategies for identifying unknowns. Attendees will gain actionable insights to streamline inventory processes and build a solid foundation for sustained compliance under the evolving regulatory framework.