California · Collection Systems
California Collection Systems Operator Certification Exam
In California, collection systems operators are certified by State Water Resources Control Board, Division of Drinking Water (water); Office of Operator Certification (wastewater). Here's exactly what the exam covers, how the grade levels work, and how to pass the first time.
Applied math is a significant part of the California 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.
California exam logistics
| Certifying agency | State Water Resources Control Board, Division of Drinking Water (water); Office of Operator Certification (wastewater) |
|---|---|
| Exam administered by | State Water Resources Control Board (in-house exams) |
| Renewal cycle | 3 years |
| Continuing education | Water: renewal requires documented continuing education (contact hours vary by grade). Collection systems (CWEA): 24 contact hours per 3-year cycle. |
California collection systems grades
California uses its own grade nomenclature. Pick your level for exam specifics and practice questions.
What the exam covers
- 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
- Odor and corrosion control
- Sanitary sewer overflow (SSO) response
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 collection systems practice questions
Sample questions with full explanations for every grade.
Take the practice quiz →Frequently asked questions
- What are the collection systems operator grades in California?
- In California, collection systems operators are certified as Grade 1, Grade 2, Grade 3, Grade 4. These correspond to the national Grade 1 through Grade 4 progression.
- Who certifies collection systems operators in California?
- State Water Resources Control Board, Division of Drinking Water (water); Office of Operator Certification (wastewater) certifies collection systems operators in California. The written exam is administered by State Water Resources Control Board (in-house exams).
- What is on the California collection systems operator exam?
- The exam covers Gravity sewer design and maintenance, Lift stations and force mains, Inflow and infiltration (I&I), Sewer cleaning and CCTV inspection, and more — plus applied math such as Pipe slope and velocity, Wet well volume and pump cycle time, Flow rate (Manning's equation basics).
- How do I renew a collection systems certification in California?
- California certifications renew every 3 years. Water: renewal requires documented continuing education (contact hours vary by grade). Collection systems (CWEA): 24 contact hours per 3-year cycle.