This project focused on the population decline of Pseudacris regilla (Pacific chorus frog) in the Dow’s Prairie Educational Wetland. Background research was done in order to determine possible reasons behind this decline. Soil and water samples were also tested for contamination. Results yielded low levels oil and grease, below EPA standard levels for heavy metals, and negative for pesticides. However, the low levels found could still impact P. regilla populations. While slight contamination was found, it is uncertain if this is the sole cause of P. regilla population decline in the wetland.