To provide an easily accessible, corrected EPA data set of the geo-referenced locations for all the National Priorities List sites in the United States and Puerto Rico.

To provide an easily accessible, corrected data set of polygons for hazardous waste sites in the United States which can be used to identify nearby populations and assess their potential risk.

To provide the ATSDR polygon data set of hazardous waste sites in the United States, which can be used to identify nearby populations and assess their potential risk.