National Priorities List
NPL
The EPA's official list of the most polluted hazardous waste sites in the country, eligible for federal cleanup funding under the Superfund program.
Related terms
Superfund Site A site in the U.S. so contaminated with hazardous substances that it is placed on the EPA's National Priorities List for long-term federal cleanup. Hazardous Substance A chemical, biological, or physical material that poses a risk to human health, property, or the environment. Regulated in the U.S. under laws like CERCLA (Superfund).