Water & wastewater operator exam prep
Pass your operator certification exam with structured prep.
Free practice questions and no-nonsense study guides for water treatment, distribution, wastewater, and collection-system operators — organized by your state, agency, and grade.
- 8+
- Free practice questions
- 16
- Practice sets
- 50
- States covered
- 4
- Operator disciplines
Choose your discipline
Four certification tracks, grades 1–4 in each.
Water Treatment
Certification for operators who treat drinking water at surface or groundwater plants.
Exam topics · math · grades 1–4 →
Water Distribution
Certification for operators who maintain the pipes, pumps, and storage that deliver drinking water.
Exam topics · math · grades 1–4 →
Wastewater Treatment
Certification for operators who treat municipal and industrial wastewater before discharge.
Exam topics · math · grades 1–4 →
Collection Systems
Certification for operators who maintain sewers and lift stations that convey wastewater.
Exam topics · math · grades 1–4 →
State resources included
Every state has its own certifying agency, exam vendor, and grade names. Start with yours.
Only about half of operators pass their certification exam on the first try.
The people who fail almost always fail the same way: the applied math. Study the right topics and you can pass the first time.
Built to be transparent, not promotional
We label what we’ve verified against a state’s own certifying agency and what’s still a national baseline. See how we source and fact-check every page.