Temperate wetlands are generally net retainers of sulfate (SO<sub>4</sub>-2). However, recent research indicates that some wetlands may export SO<sub>4</sub>-2 during drought conditions. In temperate wetlands, the susceptibility to drought will depend on wetland-stream and groundwater-surface water interactions. Here we present results of summer SO<sub>4</sub>-2 dynamics in a confined and unconfined stream within a temperate swamp in Hamilton, Ontario, Canada.