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Hydrogen sulfide (H2S) is a corrosive, flammable, and extremely toxic chemical compound which is typically formed under septic conditions in wastewater collection systems, and the root cause of odor from and corrosion of liquid waste service infrastructure. To control and mitigate H2S buildup in sewer pipelines, it is necessary to detect low concentrations of dissolved H2S. In this paper, a chemiresistive sensor, based on graphene and polymethyl methacrylate (PMMA) is developed, which is able to electrochemically measure various concentrations of H2S in aqueous media. Several tests using electrochemical impedance spectroscopy (EIS) have been conducted to characterize the sensor. The synergetic properties of graphene as the conductive component and PMMA as the linker depicted excellent performance of the thin film sensor to H2S in the range of 10 ^-2 %v/v. The results demonstrated the potential of the …