Constructed wetlands have been used to treat wastewater because of their efficiency at removing fecal indicator bacteria (FIB), their low cost, and their ease of maintenance. This study investigates the ability of a surface-flow wetland (0.03 ha in size), constructed in the rural village of Elsah, Illinois, to treat FIB pollution. The objectives of this study were to: 1) compare mean FIB concentrations (specifically thermotolerant coliforms [TTC] and enterococci [ENT]) in the wetland during low versus high precipitation conditions; 2) compare mean FIB levels among different sampling locations along the wetland’s treatment gradient; and 3) determine whether FIB and other environmental variables were significantly correlated. Both TTC and ENT levels increased during storm events, likely due to increased mobilization of sediment. Both TTC and ENT were significantly lower in zones located further from the inflow point. The strongest correlation was observed between TTC and ENT, and both parameters were strongly correlated with precipitation.