100+ Free MO Water/Wastewater Operator Practice Questions
Pass your Missouri Water and Wastewater Operator Certification Exam exam on the first try — instant access, no signup required.
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About the MO Water/Wastewater Operator Exam
The Missouri water and wastewater operator certification exam covers state-specific regulations under 10 CSR 60-14 and 10 CSR 20-9, water treatment processes, wastewater treatment operations, distribution and collection systems, laboratory testing, and safety procedures.
Questions
100 scored questions
Time Limit
2-3 hours
Passing Score
70%
Exam Fee
$45 (Missouri Department of Natural Resources (MoDNR))
MO Water/Wastewater Operator Exam Content Outline
Missouri State Laws & Regulations
MoDNR certification levels, licensing requirements, 10 CSR 60-14/20-9, reporting, and compliance
Water Treatment
Coagulation, flocculation, filtration, disinfection, chlorination, and treatment plant operations
Wastewater Treatment
Activated sludge, sludge handling, biological treatment, nutrient removal, and process control
Distribution & Collection Systems
Pump operations, hydraulics, cross-connection control, pipe maintenance, and system pressure
Laboratory Testing & Math
Water quality testing, BOD, TSS, chlorine residual, calculations, and record-keeping
How to Pass the MO Water/Wastewater Operator Exam
What You Need to Know
- Passing score: 70%
- Exam length: 100 questions
- Time limit: 2-3 hours
- Exam fee: $45
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 certification levels does Missouri offer for water operators?
Missouri offers Levels A (highest) through D (lowest) for drinking water treatment and wastewater treatment operators, and DS-I through DS-III for distribution operators.
What score do I need to pass the Missouri operator exam?
A score of 70% or higher is required to pass all Missouri water and wastewater operator certification exams.
How much does the Missouri operator exam cost?
The exam fee is $45, which covers both the examination and certificate issuance upon qualification.