This master thesis comprises the application of a multi proxy approach, where a strongly deteriorated Austrian sewer system was intensively investigated .Various crucial parameters for detecting alteration features of the applied concrete were determined in the field and laboratory, including temperature, alkalinity, pH, and conductivity as well as distinct chemical analyses of the solution, respectively. Special focus was given on mineralogical analyses including scanning electron microscopy, X-ray diffraction measurements, as well as on LECO and microprobe analyses. Furthermore, intensive analyses of chemical compositions and parameters of the pore fluids were conducted, in order to gain better understanding of the thriving corrosive forces. Moreover, the concentration of gaseous hydrogen sulfide (H2S), methane (CH4) and carbon dioxide (CO2) within the sewer pipe atmosphere was measured. Additionally, stable isotope signatures of sulfur within the wastewater, the gaseous hydrogen sulfide and the pore fluids of the damaged concrete were carried out. The deterioration of the sewage system is attributed to a couple of complex reactions, which are referred to microbial induced concrete corrosion (MICC). Anaerobic, heterotrophic bacteria, present within the sewage systems, have consumed the organic matter, thereby reducing SO42- to H2S(g). Subsequently, degassing of the H2S and its diffusion in the concrete lining, followed by its oxidation due to aerobic sulfur oxidizing bacteria occurred, thereby producing sulfuric acid (H2SO4). H2SO4 caused dissolution of the cementitious phases as well as gypsum formation, which finally caused the severe damage of the concrete within only several years.