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An Experimental StudyGeochemie, Universität Karlsruhe (TH),The risk potential of sewage exfiltrating from leaky sewers for the groundwater depends on Fritz-Haber-Weg 2, a series of physico-chemical, geochemical, and microbial processes, which are all linked in 76131 Karlsruhe, Germany some way to the redox state of the system. Since bacterial sulfate reduction is a decisive transformation process under anaerobic conditions and is known to cause isotope fractionations, changes in the S-isotope composition of sulfate may be used to characterise the redox state in sediments affected by percolating sewage.