Manhole structures are the principal means of access for collection system maintenance. Effective manhole inspection and rehabilitation are necessary to remove excessive manhole infiltration and inflow, improve manhole structural integrity, address public safety related issues, and implement general system maintenance needs. This document, Manhole inspection and Rehabilitation, provides technical guidance for implementing such a program. It covers such aspects as: manhole inspection; safety; data recording; quantification of infiltration and inflow; rehabilitation methods; manhole conditions; cost-effectiveness analysis; construction inspection; and quality control.