Maintaining your education is important, especially in a career that demands licensing exams. Prove you’re an expert operator by answering this question and others from our Exam Study Guide Series. Take a look at this sample wastewater treatment licensing question along with an explanation of the correct answer.

Sample question:

What is the MCL for Haloacetic acids?

A) 60.0 mg/L

B) 0.060 mg/L

C) 0.060 ug/L

D) 6.0 ug/L

The correct answer is B, according to the EPA. The potential health effects from long-term exposure above the MCL include an increased cancer risk. Haloacetic acids are a byproduct of disinfecting drinking water.

About the author: Drew Hoelscher is the program director of drinking water operations at the Environmental Resources Training Center (ERTC) in Edwardsville, Illinois.