Explore the growing issue of inflow and infiltration (I&I) in underground assets and the advantages of using ultra-high build epoxy lining systems as a targeted solution. This paper outlines the rise in inflow and infiltration (I&I) abatement programs, the importance of bond strength in creating a fully sealed monolithic film, and compares popular manhole lining methods. It also to highlight the key attributes and benefits of using an applied and bonded, ultra-high build, high-strength epoxy lining system as a trenchless approach to addressing I&I issues in various underground assets.