The City of Los Angeles Wastewater Collection Systems Division inspects, cleans, operates, and maintains the City's entire storm drain system requiring the inspection and cleaning of nearly 40,000 City-owned catch basins. Prior methods of inspection required paper markups and an extensive document handling process. Psomas developed a GIS-based application that runs on handheld pen-based computers and integrates maps and inventory worksheets into a single interface. The result is a streamlined process that reduces time and effort and minimizes errors. This paper will discuss the unique advantage of integrating GIS in field data collection systems.