Lead in drinking water. The US. Environmental Protection Agency (EPA) sets a lim

Question

Lead in drinking water. The US. Environmental Protection Agency (EPA) sets a limit on the amount of lead permitted in drinking water. The EPA Action Level for lead is .015 milligrams per liter (mg/L) of water. Under EPA guidelines, if 90% of a water system's study samples have a lead concentration less than .015 mg/L, the water is considered safe for drinking. I (co-author Sincich) received a report on a study of lead levels in the drinking water of homes in my subdivision. The 90th percentile of the study sample had a lead concentration of .00372 mg/L. Are water customers in my subdivision at risk of drinking water with unhealthy lead levels? Explain.

Explanation / Answer

Here we are given that 90th percentile of the study sample had a lead concentration of 0.00372 mg/L . This means that of all the water system's study samples, 90% of them would have a lead concentration of less than 0.00372mg/ L which obviously means that 90% of the samples would have a lead concentration of 0.015 mg /L . Therefore the water is considered safe for drinking and water customers in my subdivision are not at risk of drinking water with unhealthy bad levels.

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