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The NAM filed an amicus brief in the U.S. Court of Appeals for the DC Circuit challenging the Environmental Protection Agency’s (EPA) decision to place an industrial site on the National Priorities List (NPL) under the Superfund program. The NPL is a list of contaminated sites that EPA has determined have the highest priority for investigation and possible cleanup. The site at issue in this case was placed on the list based solely on subsurface intrusion, also known as “vapor intrusion,” without considering the site’s sub-slab depressurization system used to mitigate vapor intrusion. If upheld, the EPA’s decision to exclude the mitigation system would undermine the efforts of manufacturers who have proactively installed and operated these systems. The NAM’s brief argued that the EPA arbitrarily and unlawfully failed to take into account the active mitigation system and used a residential rather than industrial exposure benchmark. Unfortunately, on July 28, 2020, the court declined to review EPA's decision.