The principle screening tool used by EPA to evaluate risks to public health and the environment associated
with abandoned or uncontrolled hazardous waste sites. The HRS calculates a score based on the potential of
hazardous substances spreading from the site through the air, surface water, or ground water, and on other
factors such as density and proximity of human population. This score is the primary factor in deciding if the
site should be on the National Priorities List and, if so, what ranking it should have compared to other sites on
the list.
Glossary
Hazardous Ranking System
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