This paper focuses on the integration of multi-source data for managing wastewater network information. The data come from various sources such as maps, photographs, videos, and geographic information systems (GIS). These sources are heterogeneous in quality and often contain imprecise, inconsistent, or missing data. Leveraging the complementarity of these sources is essential to reduce inconsistencies, improve data accuracy, particularly regarding the geographic location of manholes and pipes, and thereby enhance the overall understanding of the network. We concentrate on two specific types of data. The first is geographic information systems (GIS), which manage detailed information on manholes and pipes across separate, comprehensive datasets. The second consists of television inspection videos (ITV) of pipes from a specific area within the Montpellier metropolitan region. Recent studies have enabled the generation of a graphical representation of the wastewater network in the inspected area based on ITV videos. However, the manholes visible in the videos lack precise geographic coordinates, making accurate localization challenging or even unfeasible. The goal is to integrate GIS and ITV data to achieve the most accurate and comprehensive representation possible of the wastewater network, with a particular focus on precisely determining the geographic locations of the manholes identified in the ITV data.