Excess phosphorus (P) leads to eutrophication of aquatic ecosystems as recently seen in Lake Erie. The potential for wetlands to remove phosphorus from the water column varies based on the mineral composition, including total iron concentration, of the sediments, herbaceous cover, age of the wetland, and surrounding land usage. In the summer of 2019, I collected sediment samples from open water areas, Typha stands, and mud-flats in three constructed, urbanized wetlands on Kent State University’s campus. To determine the primary mechanisms of phosphorus retention in each wetland, I measured percent organic matter, total iron oxides, the proportion of poorly-crystalline iron oxides, and P sorption capacity. This information could help guide future construction of wetlands in urbanized areas to maximize phosphorus retention to prevent downstream pollution.