The ranking system used to place sites on the National Priorities List is based on relative risk to human health and the environment, rather than actual risk.

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The ranking system used to place sites on the National Priorities List (NPL) is based on the potential or relative risk to human health and the environment, rather than actual risk. This means that sites are evaluated based on the likelihood that they could pose a risk to human health and the environment, rather than the severity of the risk they currently pose. Once a site is listed on the NPL, further evaluation is conducted to determine the actual risk and appropriate cleanup actions.

The Ranking System Used to Place Sites on the National