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Question 1

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Which Oklahoma state agency administers the water and wastewater operator certification program?

Oklahoma Department of Health

Oklahoma Department of Environmental Quality (ODEQ)

Oklahoma Water Resources Board

Oklahoma Corporation Commission

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Sample OK Water/Wastewater Operator Practice Questions

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1Which Oklahoma state agency administers the water and wastewater operator certification program?

A.Oklahoma Department of Health

B.Oklahoma Department of Environmental Quality (ODEQ)

C.Oklahoma Water Resources Board

D.Oklahoma Corporation Commission

Explanation: The Oklahoma Department of Environmental Quality (ODEQ), Water Quality Division, Operator Certification Unit administers all waterworks and wastewater works operator certification under OAC 252:710. ODEQ trains and licenses all persons working in water and wastewater treatment plants, groundwater systems, and sewage lagoons statewide.

2What are the certification levels for Oklahoma waterworks and wastewater operators?

A.Levels 1, 2, 3, and 4

B.Classes A, B, C, and D

C.Grades I, II, III, and IV

D.Tiers 1, 2, and 3

Explanation: Oklahoma uses Classes A, B, C, and D for both waterworks and wastewater works operator certification, with D being the entry level and A being the highest. Additionally, Oklahoma offers ABC level laboratory operator certification. The classification system is defined under OAC 252:710.

3What is the minimum passing score on the Oklahoma water/wastewater operator certification exam?

A.60%

B.65%

C.70%

D.75%

Explanation: At least 70% of the questions must be answered correctly to pass either the Oklahoma waterworks or wastewater works operator certification exam. This applies to all certification classes (A through D) and all exam categories.

4How far in advance must an ODEQ exam application be submitted before the certification class start date?

A.7 days

B.14 days

C.21 days

D.30 days

Explanation: ODEQ exam applications must be completed online at least 21 days before the certification class start date. Applications are submitted through the ODEQ Water & Wastewater Operator Certification Portal. Late applications may not be processed in time for the scheduled examination.

5Under OAC 252:710, what education can substitute for the 32 hours of ODEQ-approved C-level training?

A.Any high school diploma

B.An associate's degree or greater in chemistry, biology, engineering, physical science, or related field

C.A GED certificate

D.No education substitution is allowed

Explanation: Under OAC 252:710, an associate's degree or greater in chemistry, biology, engineering, physical science, hydrology, geology, math, environmental science, microbiology, toxicology, or civil, chemical, sanitary, or environmental engineering may be substituted for the 32 hours of ODEQ-approved C-level training requirement.

6How many years of operating experience are required for an Oklahoma Class A waterworks operator?

A.2 years

B.3 years

C.5 years including 2 years hands-on

D.10 years

Explanation: Oklahoma Class A waterworks operator certification requires 5 years of waterworks operation experience, including at least 2 years of actual hands-on operating experience. This is the highest level of certification and authorizes the operator to manage the most complex water treatment and distribution systems in Oklahoma.

7What is the primary role of the ODEQ Operator Certification Unit?

A.Building water treatment plants

B.Training and licensing all persons working in water and wastewater plants, groundwater systems, and sewage lagoons

C.Selling water treatment chemicals

D.Managing water utility billing systems

Explanation: The ODEQ Operator Certification Unit is responsible for training and licensing all persons working in water and wastewater treatment plants, operating groundwater systems, and managing sewage lagoons in Oklahoma. The unit administers certification exams, approves training courses, and enforces operator qualification standards under OAC 252:710.

8What is the purpose of coagulation in water treatment?

A.To kill bacteria and viruses

B.To destabilize colloidal particles so they can be removed by sedimentation and filtration

C.To add fluoride to the water

D.To increase the pH of acidic water

Explanation: Coagulation destabilizes colloidal particles (tiny particles too small to settle on their own) by neutralizing their negative surface charges. Metal salt coagulants like aluminum sulfate (alum) or ferric chloride add positively charged ions that neutralize the repulsive forces between particles, allowing them to aggregate during flocculation and settle during sedimentation.

9What is the maximum contaminant level (MCL) for arsenic in drinking water?

A.0.005 mg/L

B.0.010 mg/L

C.0.050 mg/L

D.0.100 mg/L

Explanation: The EPA MCL for arsenic in drinking water is 0.010 mg/L (10 ppb), enforced by ODEQ. Arsenic is a naturally occurring element that can enter water supplies through geological formations. Long-term exposure to arsenic above the MCL is associated with increased risk of cancer and other health effects. Oklahoma groundwater systems must monitor for arsenic compliance.

10What chemical reaction occurs when chlorine gas is added to water?

A.Cl₂ + H₂O → HOCl + HCl

B.Cl₂ + O₂ → ClO₂

C.Cl₂ + NaOH → NaCl + H₂O

D.Cl₂ → 2Cl⁻

Explanation: When chlorine gas dissolves in water, it forms hypochlorous acid (HOCl) and hydrochloric acid (HCl): Cl₂ + H₂O → HOCl + HCl. Hypochlorous acid is the primary disinfecting agent. The effectiveness of HOCl depends on pH — at lower pH (below 7.5), more chlorine exists as HOCl, which is a much stronger disinfectant than the hypochlorite ion (OCl⁻) that predominates at higher pH.

About the OK Water/Wastewater Operator Exam

The Oklahoma water and wastewater operator certification exam covers OAC 252:710, ODEQ regulations, water treatment processes, wastewater treatment including activated sludge and lagoon systems, distribution and collection systems, pump operations, laboratory testing, and safety procedures.

Questions

100 scored questions

Time Limit

2-3 hours

Passing Score

70%

Exam Fee

Varies by certification class (Oklahoma Department of Environmental Quality (ODEQ))

OK Water/Wastewater Operator Exam Content Outline

20%

State Laws & Regulations

OAC 252:710, ODEQ certification classes A-D, experience requirements, and NPDES compliance

20%

Water Treatment

Coagulation, filtration, disinfection, groundwater treatment, and fluoridation

20%

Wastewater Treatment

Activated sludge, lagoon systems, sludge handling, and nutrient removal

20%

Distribution & Collection

Pumps, valves, hydrants, force mains, cross-connections, and I/I management

20%

Laboratory & Safety

Sampling procedures, quality testing, record-keeping, OSHA compliance, and confined space entry

How to Pass the OK Water/Wastewater Operator Exam

What You Need to Know

Passing score: 70%
Exam length: 100 questions
Time limit: 2-3 hours
Exam fee: Varies by certification class

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Frequently Asked Questions

What are Oklahoma's operator certification levels?

Oklahoma uses Classes A, B, C, and D for both waterworks and wastewater works, with D as entry level and A as the highest. Class A requires 5 years of experience including 2 years hands-on.

How do I apply for the Oklahoma water operator exam?

Applications must be completed online through the ODEQ Water & Wastewater Operator Certification Portal at least 21 days before the certification class start date.

Can education substitute for ODEQ training requirements?

Yes — an associate's degree or greater in chemistry, biology, engineering, or related fields can substitute for the 32 hours of ODEQ-approved C-level training.