Post-wildfire erosion to downstream surface waters can deteriorate water quality to levels that can create challenges for aquatic life and drinking water treatment. Polymeric additives, xanthan gum (XG) and polyacrylamide (PAM), have been demonstrated to be effective for controlling erosion in the presence of hydrophilic ash. However, with repeated rainfall applications, some of the applied XG and PAM may mobilize with the runoff and enter surface waters, which may pose water quality concerns. In this study, indoor rainfall simulation experiments were performed on plots containing wildfire-burned soil overlaid by hydrophilic ash collected after the 2021 Green Ridge Wildfire near Walla Walla, WA. The plots were treated with three concentrations (11, 33, and 60 kg ha