•Prior to passage of the Brownfield Revitalization Act, EPA considered brownfields to be abandoned, idled, or underused facilities where expansion or redevelopment was complicated by real or perceived contamination.  •The new law modified that working definition of a brownfield site to “real property, the expansion, redevelopment, or reuse of which may be complicated by the presence or potential presence of a hazardous substance pollutant or contaminant.”