Texas · Collection Systems · Class III
Texas Grade 4 Collection Systems Operator Exam
The Texas Grade 4 collection systems certification is designated Class III and issued by Texas Commission on Environmental Quality (TCEQ). Highest certification for chief operators and superintendents at the largest, most complex systems.
Applied math is a significant part of the Texas Class III 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 | Class III |
|---|---|
| Questions | 120 |
| Time limit | 210 minutes |
| Passing score | 70% |
| Difficulty | Expert |
| Exam administered by | TCEQ (administered at approved testing centers) |
Prerequisites for Class III
- Grade 3 certification
- 4+ years of operating experience including supervisory time
- College coursework or degree (varies by state)
Confirm exact requirements with Texas Commission on Environmental Quality (TCEQ).
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 Class III practice questions
Sample questions with full explanations at this level.
Take the practice quiz →Frequently asked questions
- What is the Texas Grade 4 collection systems certification called?
- In Texas, the Grade 4 collection systems certification is designated Class III, issued by Texas Commission on Environmental Quality (TCEQ).
- How many questions are on the exam and what score do I need?
- The exam has about 120 questions with a 210-minute time limit, and you need 70% to pass. It is administered by TCEQ (administered at approved testing centers).
- What are the prerequisites for Class III in Texas?
- Typical prerequisites: Grade 3 certification; 4+ years of operating experience including supervisory time; College coursework or degree (varies by state). Exact requirements are set by Texas Commission on Environmental Quality (TCEQ).