Texas · Wastewater Treatment
Texas Wastewater Treatment Operator Certification Exam
In Texas, wastewater treatment operators are certified by Texas Commission on Environmental Quality (TCEQ). 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 Texas wastewater treatment 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.
Texas exam logistics
| Certifying agency | Texas Commission on Environmental Quality (TCEQ) |
|---|---|
| Exam administered by | TCEQ (administered at approved testing centers) |
| Renewal cycle | 3 years |
| Continuing education | Water/wastewater: 30 training hours (3.0 CEUs) per 3-year renewal for most classes; Class A/B may require more. |
Texas wastewater treatment grades
Texas uses its own grade nomenclature. Pick your level for exam specifics and practice questions.
What the exam covers
- Preliminary and primary treatment
- Activated sludge process control
- Secondary clarification
- Nutrient removal (nitrogen, phosphorus)
- Disinfection and dechlorination
- Solids handling and biosolids
- Laboratory analysis and sampling
- NPDES permits and regulations
The math on the Wastewater Treatment exam
These calculations are commonly included in wastewater treatment 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.
- Food-to-microorganism (F:M) ratio
- Mean cell residence time (MCRT/SRT)
- Sludge volume index (SVI)
- Hydraulic and organic loading
- Detention time
- Pounds formula (lbs/day)
Free wastewater treatment practice questions
Sample questions with full explanations for every grade.
Take the practice quiz →Frequently asked questions
- What are the wastewater treatment operator grades in Texas?
- In Texas, wastewater treatment operators are certified as Class D, Class C, Class B, Class A. These correspond to the national Grade 1 through Grade 4 progression.
- Who certifies wastewater treatment operators in Texas?
- Texas Commission on Environmental Quality (TCEQ) certifies wastewater treatment operators in Texas. The written exam is administered by TCEQ (administered at approved testing centers).
- What is on the Texas wastewater treatment operator exam?
- The exam covers Preliminary and primary treatment, Activated sludge process control, Secondary clarification, Nutrient removal (nitrogen, phosphorus), and more — plus applied math such as Food-to-microorganism (F:M) ratio, Mean cell residence time (MCRT/SRT), Sludge volume index (SVI).
- How do I renew a wastewater treatment certification in Texas?
- Texas certifications renew every 3 years. Water/wastewater: 30 training hours (3.0 CEUs) per 3-year renewal for most classes; Class A/B may require more.