Waste and Cleanup Risk Assessment

The National Academy of Sciences Risk Assessment Paradigm forms the basis for risk assessment within EPA's Office of Solid Waste and Emergency Response (OSWER). Click a topic in the diagram below for more information on that topic.

Human health risk assessment is the characterization of the potential adverse health effects of human exposures to environmental hazards. Risk assessments can be either quantitative or qualitative in nature. The elements of a human health risk assessment consist of planning and scoping, acute hazards, evaluating toxicity, assessing exposures and characterizing risks.

Ecological risk assessment "evaluates the likelihood that adverse ecological effects may occur or are occurring as a result of exposure to one or more stressors." The process is used to systematically evaluate and organize data, information, assumptions, and uncertainties in order to help understand and predict the relationships between stressors and ecological effects in a way that is useful for environmental decision making. The elements of an ecological risk assessment consist of planning and scoping, problem formulation, evaluating toxicity, assessing exposures and characterizing risks.

In EPA's Waste and Cleanup Risk Assessment programs, risk assessments are performed for several different reasons. More detailed descriptions of risk assessment within each program can be found by visiting the links below:

• Chemical Accident Prevention - Office of Emergency Prevention, Preparedness and Response - prevention, preparedness, and response to accidental releases of hazardous chemicals
• Federal Facilities Restoration and Reuse Office - quantification of potential human health and ecological risks at Federal Facilities
• Office of Underground Storage Tanks - utilization of risk and exposure assessment methodologies to help Underground Storage Tank implementing agencies make determinations about the extent and urgency of corrective action
• Resource Conservation and Recovery Act Corrective Action - quantification of potential human health and ecological risks at active hazardous waste facilities
• Resource Conservation and Recovery Act Hazardous Waste Combustion Facilities - quantification of potential human health and ecological risks for hazardous waste combustion facility permits
• Office of Superfund Remediation and Technology Innovation - quantification of potential human health and ecological risks at inactive hazardous waste sites

EPA waste risk managers use the results of the human health and ecological risk assessments along with engineering data and other considerations, such as economic and legal concerns, to reach decisions regarding the need for and practicability of implementing various risk reduction activities and as a basis for communicating risks to interested parties and the public.