WATER DISTRIBUTION OPERATOR CERTIFICATION PRACTICE EXAM – COMPREHENSIVE STUDY QUESTIONS & ANSWERS

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WATER DISTRIBUTION OPERATOR CERTIFICATION
PRACTICE EXAM – COMPREHENSIVE STUDY
QUESTIONS & ANSWERS
(CORRECT ANSWERS IN BOLD)
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, Water Distribution Operator Certification Practice Exam

Section 1: Regulations, Reporting, and Records

1. Which agency sets legal limits on the concentration levels of harmful contaminants in

potable water?

A. Centers for Disease Control (CDC)

B. Occupational Safety and Health Administration (OSHA)

C. U.S. Environmental Protection Agency (EPA)

D. State Primacy Agency

Rationale: The EPA is the federal agency responsible for setting and enforcing National Primary

Drinking Water Regulations under the Safe Drinking Water Act.

2. A positive E. coli test must be reported to the primacy agency within what time period?

A. 48 hours

B. 1 week

C. 24 hours

D. 1 month

Rationale: An E. coli positive test is a Tier 1 violation, representing an acute risk to public

health, requiring immediate notification within 24 hours.

3. How is the required number of monthly bacteriological samples for a distribution system

determined?

A. By the number of water sources

B. Based on the population served