100+ Free NH Water/Wastewater Operator Practice Questions
Pass your New Hampshire Water and Wastewater Operator Certification Exam exam on the first try — instant access, no signup required.
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About the NH Water/Wastewater Operator Exam
The New Hampshire water and wastewater operator certification exam covers NHDES regulations, water works operations (Grade 1A through Grade 4), wastewater treatment (Grade I-IV), distribution systems, laboratory testing, and safety procedures.
Questions
100 scored questions
Time Limit
2-3 hours
Passing Score
70%
Exam Fee
Varies by grade (New Hampshire Department of Environmental Services (NHDES))
NH Water/Wastewater Operator Exam Content Outline
New Hampshire State Laws & Regulations
NHDES certification grades, Grade 1A through Grade 4, wastewater Grades I-IV, and compliance
Water Treatment
Coagulation, flocculation, filtration, disinfection, and treatment for New England source waters
Wastewater Treatment
Activated sludge, sludge handling, biological treatment, nutrient removal, and process control
Distribution & Collection Systems
Pump operations, hydraulics, freeze protection, cross-connection control, and maintenance
Laboratory Testing & Math
Water quality testing, BOD, TSS, chlorine residual, calculations, and record-keeping
How to Pass the NH 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 grade
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 New Hampshire offer for water operators?
New Hampshire has five water works grades (1A, 1, 2, 3, 4) and four wastewater grades (I through IV).
What is the Grade 1A certification?
Grade 1A is the entry-level certification for small public water systems, requiring a high school diploma and the Small Public Water System Operator Course or 6 months experience.
When are 2026 exam dates?
In-person water works exams: April 21, July 21, October 29. Wastewater: first Wednesday of June and December. Computer-based exams available at multiple locations.