California · Collection Systems · Grade 2
California Grade 2 Collection Systems Operator Exam
The California Grade 2 collection systems certification is designated Grade 2 and issued by State Water Resources Control Board, Division of Drinking Water (water); Office of Operator Certification (wastewater). Intermediate certification for operators running day-to-day operations at small to mid-size systems.
Applied math is a significant part of the California Grade 2 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 level | Grade 2 |
|---|---|
| Questions | 100 |
| Time limit | 150 minutes |
| Passing score | 70% |
| Difficulty | Intermediate |
| Exam administered by | State Water Resources Control Board (in-house exams) |
Prerequisites for Grade 2
- Grade 1 certification (in most states)
- 1–2 years of operating experience
Confirm exact requirements with State Water Resources Control Board, Division of Drinking Water (water); Office of Operator Certification (wastewater).
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
- Process control adjustments
- Applied treatment math
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 2 practice questions
Sample questions with full explanations at this level.
Take the practice quiz →Frequently asked questions
- What is the California Grade 2 collection systems certification called?
- In California, the Grade 2 collection systems certification is designated Grade 2, issued by State Water Resources Control Board, Division of Drinking Water (water); Office of Operator Certification (wastewater).
- How many questions are on the exam and what score do I need?
- The exam has about 100 questions with a 150-minute time limit, and you need 70% to pass. It is administered by State Water Resources Control Board (in-house exams).
- What are the prerequisites for Grade 2 in California?
- Typical prerequisites: Grade 1 certification (in most states); 1–2 years of operating experience. Exact requirements are set by State Water Resources Control Board, Division of Drinking Water (water); Office of Operator Certification (wastewater).