Oklahoma Waterworks Operator Class
D Exam Practice Questions And
Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
Download Pdf.
1. Which of the following best describes the primary purpose of
Oklahoma’s waterworks operator certification program for Class D
operators?
A. To authorize operators to design public water treatment facilities
B. To ensure operators demonstrate the knowledge, skills, abilities, and
judgment necessary to operate waterworks safely and effectively
C. To replace all federal drinking-water regulations with state
requirements
D. To authorize operators to perform professional engineering services
Answer: B
The Oklahoma Department of Environmental Quality certification
program is intended to establish operator competency so that
waterworks are operated in a manner protective of public health and
water quality.
, 2. Under Oklahoma’s operator certification requirements, what is the
minimum passing score for a validated waterworks operator
examination?
A. 60 percent
B. 65 percent
C. 70 percent
D. 75 percent
Answer: C
An applicant must correctly answer at least 70 percent of the
examination questions to pass the validated certification examination.
3. An applicant for a Class D waterworks operator certification has no
previous waterworks operating experience. Which combination
most closely represents the minimum Class D examination
qualification?
A. 16 hours of DEQ-approved training and no operating experience
B. 36 hours of DEQ-approved training and one year of experience
C. 100 hours of DEQ-approved training and three years of experience
D. 200 hours of advanced training and five years of experience
Answer: A
Oklahoma’s published certification information identifies Class D
operators as requiring 16 hours of DEQ-approved training with no
experience requirement.
, 4. Which organization is responsible for administering Oklahoma’s
water and wastewater operator certification program?
A. Oklahoma Water Resources Board
B. Oklahoma Department of Environmental Quality
C. Oklahoma Corporation Commission
D. Oklahoma State Department of Agriculture
Answer: B
The Oklahoma Department of Environmental Quality administers the
operator certification program and is responsible for testing and
certifying water and wastewater operators.
5. A Class D operator is preparing for an examination and wants to
understand what a validated examination is intended to measure.
Which statement is most accurate?
A. It primarily measures memorization of equipment manufacturers’
catalogs
B. It measures skills, knowledge, abilities, and judgment appropriate to
the classification
C. It measures only mathematical calculation skills
D. It measures only the operator’s years of employment
Answer: B
, Oklahoma rules specify that validated examinations are intended to
demonstrate the skills, knowledge, abilities, and judgment appropriate
to the operator classification.
6. Which physical or chemical process is commonly used in a drinking-
water treatment system to destroy or inactivate disease-causing
microorganisms?
A. Chlorination
B. Sedimentation only
C. Screening only
D. Aeration only
Answer: A
Chlorination is widely used as a drinking-water disinfection process
because chlorine can inactivate many pathogenic microorganisms and
provide a measurable disinfectant residual.
7. Why is maintaining an adequate disinfectant residual important in a
potable-water distribution system?
A. It increases water hardness
B. It provides continuing protection against microbial contamination
within the distribution system
C. It removes all dissolved minerals
D. It eliminates the need for water-quality monitoring
Answer: B
D Exam Practice Questions And
Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
Download Pdf.
1. Which of the following best describes the primary purpose of
Oklahoma’s waterworks operator certification program for Class D
operators?
A. To authorize operators to design public water treatment facilities
B. To ensure operators demonstrate the knowledge, skills, abilities, and
judgment necessary to operate waterworks safely and effectively
C. To replace all federal drinking-water regulations with state
requirements
D. To authorize operators to perform professional engineering services
Answer: B
The Oklahoma Department of Environmental Quality certification
program is intended to establish operator competency so that
waterworks are operated in a manner protective of public health and
water quality.
, 2. Under Oklahoma’s operator certification requirements, what is the
minimum passing score for a validated waterworks operator
examination?
A. 60 percent
B. 65 percent
C. 70 percent
D. 75 percent
Answer: C
An applicant must correctly answer at least 70 percent of the
examination questions to pass the validated certification examination.
3. An applicant for a Class D waterworks operator certification has no
previous waterworks operating experience. Which combination
most closely represents the minimum Class D examination
qualification?
A. 16 hours of DEQ-approved training and no operating experience
B. 36 hours of DEQ-approved training and one year of experience
C. 100 hours of DEQ-approved training and three years of experience
D. 200 hours of advanced training and five years of experience
Answer: A
Oklahoma’s published certification information identifies Class D
operators as requiring 16 hours of DEQ-approved training with no
experience requirement.
, 4. Which organization is responsible for administering Oklahoma’s
water and wastewater operator certification program?
A. Oklahoma Water Resources Board
B. Oklahoma Department of Environmental Quality
C. Oklahoma Corporation Commission
D. Oklahoma State Department of Agriculture
Answer: B
The Oklahoma Department of Environmental Quality administers the
operator certification program and is responsible for testing and
certifying water and wastewater operators.
5. A Class D operator is preparing for an examination and wants to
understand what a validated examination is intended to measure.
Which statement is most accurate?
A. It primarily measures memorization of equipment manufacturers’
catalogs
B. It measures skills, knowledge, abilities, and judgment appropriate to
the classification
C. It measures only mathematical calculation skills
D. It measures only the operator’s years of employment
Answer: B
, Oklahoma rules specify that validated examinations are intended to
demonstrate the skills, knowledge, abilities, and judgment appropriate
to the operator classification.
6. Which physical or chemical process is commonly used in a drinking-
water treatment system to destroy or inactivate disease-causing
microorganisms?
A. Chlorination
B. Sedimentation only
C. Screening only
D. Aeration only
Answer: A
Chlorination is widely used as a drinking-water disinfection process
because chlorine can inactivate many pathogenic microorganisms and
provide a measurable disinfectant residual.
7. Why is maintaining an adequate disinfectant residual important in a
potable-water distribution system?
A. It increases water hardness
B. It provides continuing protection against microbial contamination
within the distribution system
C. It removes all dissolved minerals
D. It eliminates the need for water-quality monitoring
Answer: B
