US EPA Model Lead Inspector Practice Test

What is the level of concern in water for lead expressed in parts per billion?

5 ppb 15 ppb or 15 ug/L 50 ppb 100 ppb

Correct Answer:

15 ppb or 15 ug/L

Explanation:

The level of concern for lead in drinking water is defined by an action level of 15 ppb under the Lead and Copper Rule. This means that when lead concentrations exceed 15 parts per billion in a significant portion of taps, the water system must take steps to reduce lead exposure, such as optimizing corrosion control, public education, and lead service line replacement. For water, 15 ppb is the same as 15 µg/L, since 1 ppb roughly equals 1 µg/L in dilute solutions. So, 15 ppb (or 15 µg/L) is the threshold that triggers required protective actions. Other values are not the EPA action level used to determine when those steps are needed.

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