Hazardous waste sites posing the greatest threat to health and the ecology are placed on the National Priorities List (NPL).

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The National Priorities List (NPL) is a list of hazardous waste sites in the United States that are considered to be a threat to public health and/or the environment. Sites are placed on the list based on criteria such as the toxicity of the waste, proximity to populated areas, and potential for migration into water sources. Once on the list, the sites are prioritized for cleanup and remediation efforts.

Hazardous Waste Sites Posing the Greatest Threat to Health and the Ecology