Collection Systems · Expert
Grade 4 Collection Systems Operator Exam
Highest certification for chief operators and superintendents at the largest, most complex systems.
Applied math is a significant part of the Grade 4 collection systems exam.
Practicing calculations like dosage, detention time, and loading before test day is one of the most effective ways to prepare, alongside reviewing your state’s official exam content outline.
Exam facts
Grade/class terminology and exact requirements vary by state. The figures below are national baselines; find your state’s own grade names and rules on its certification page.
| Grade level | Grade 4 |
|---|---|
| Questions | 120 |
| Time limit | 210 minutes |
| Passing score | 70% |
| Difficulty | Expert |
Prerequisites
- Grade 3 certification
- 4+ years of operating experience including supervisory time
- College coursework or degree (varies by state)
Requirements vary by state — check your state page for exact rules.
What's on the exam
- Gravity sewer design and maintenance
- Lift stations and force mains
- Inflow and infiltration (I&I)
- Sewer cleaning and CCTV inspection
- Manhole rehabilitation
- Confined space entry and safety
- Plant-wide optimization
- Management, budgeting, and staffing
The math on the Collection Systems exam
These calculations are commonly included in collection systems operator exam preparation and may appear on your exam depending on your certification level and state. Practicing them is one of the most effective ways to prepare.
- Pipe slope and velocity
- Wet well volume and pump cycle time
- Flow rate (Manning's equation basics)
- Pump horsepower
- Force main detention time
- Infiltration rate (gpd per inch-mile)
Free Grade 4 practice questions
Try a few sample questions with full explanations.
Take the practice quiz →