Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

What concentration level of lead in drinking water is considered actionable by the EPA?

1. 10 ug/dL

2. 5 ug/dL

3. 15 ug/dL

4. 20 ug/dL

The correct answer is: 5 ug/dL

The concentration level of lead in drinking water that is considered actionable by the EPA is 15 micrograms per liter (ug/L), which is equivalent to parts per billion (ppb). When lead levels exceed this threshold, action is required to reduce exposure, as lead can pose serious health risks, particularly to children and pregnant women. The EPA has established this action level based on its assessment of health risks associated with lead exposure. When lead concentrations are found to be above 15 ug/L, utilities must take steps to optimize corrosion control treatment, notify the public, and enhance their monitoring efforts to ensure that lead levels are being managed effectively. The answer stating 5 ug/dL does not correspond to the actionable level for drinking water; rather, it refers to blood lead level measurements in children, where interventions are recommended at lower concentrations. The 10 ug/dL is not related to drinking water action levels either, as it pertains to the same context of blood lead levels rather than water quality. The choice of 20 ug/dL is incorrect because it exceeds the EPA's action threshold of 15 ug/L, which would require intervention rather than being considered actionable.