The US. Environmental Protection Agency (EPA) sets a limit on the amount of lead

Question

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 as 90th percentile of study sample had a lead concentration of 0.00372 mg/L. That indicates that 90 percent of sample has lead concentration below 0.00372 which is less then 0.015 mg/L.

Therefore water customers in your subdivision is not at risk of drinking water with unhealthy lead levels

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