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Lead in drinking water. The U.S. Environmental Protection
Chapter , Problem 99E(choose chapter or problem)
Problem 99E
Lead in drinking water. The U.S. 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 (coauthor Sincich) received a recent 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.
Questions & Answers
QUESTION:
Problem 99E
Lead in drinking water. The U.S. 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 (coauthor Sincich) received a recent 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.
ANSWER:
Solution:
Step 1 of 2:
Under EPA guidelines, if 90% of a water system’s study samples have a lead concentration less than 0.15 mg/L, the water is considered safe for drinking.
In the report the 90th percentile of the study samples have a lead concentration of .00372 mg/L.
We have to find whether the water customers in the given subdivision at risk of drinking water with unhealthy lead levels.