Abstract This study uses hedonic modeling to estimate the economic benefits of remediation in the Ashtabula River Area of Concern (AOC) in Ohio. Data from residential single-family housing sales between 1997 and 2020 are used in a spatial difference-in-difference (DiD) analysis. The analysis compares housing price differences pre- and post-remediation between houses sold within 2000 m of the AOC and houses sold outside of this area. Rather than a recovery of housing prices after remediation, results indicate additional losses of 14%. Total property losses amount to $40.2 million. Past studies conducted using benefit transfers prior to remediation had predicted property value benefits of as much as $35.6 million. The contrast between predicted and observed impacts on property value highlights the need for more retrospective analysis to identify actions that will yield better predictions and outcomes.