The Hazard Ranking System
A site's HRS score can range from 0 to 100. The HRS was established in 1982 to rank hazardous waste sites so that the most serious could be included on the NPL.
A cutoff score of 28.50 was established for listing on the NPL.
- This score was set to meet the Congressional mandate
of 400 sites on the original NPL.
- This score appears to flag 5 to 10 percent of all sites as NPL sites. (Since 1991, EPA has, on average, added 30 sites per year to the NPL.)
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