Water · Distribution · Wastewater · Collection
They hand you the formulas.
That is not the hard part.
The standardized operator exams come with a formula and conversion table on the desk. Nobody fails for lack of formulas. They fail picking the wrong one, botching a unit conversion, or running out of clock.
- Scored questions
- 100
- Time
- 3 hrs
- Pass
- 70
- Formula sheet
- Provided
- Series
- 4
Standardized exams from Water Professionals International (formerly the Association of Boards of Certification), used by more than 40 state certifying authorities. Up to10 additional unscored pretest questions may appear. Your state sets eligibility, grades and renewal.
Four series, one ladder
Water Treatment
Running the plants that turn raw water into drinking water.
Water Distribution
The mains, tanks, pumps and hydrants between the plant and the tap.
Wastewater Treatment
The plants that clean used water before it returns to the environment.
Wastewater Collection
The sewers and lift stations that carry used water to the plant.
Essential work
Roughly 124,800 water and wastewater treatment plant and system operators are employed in the United States, per the U.S. Bureau of Labor Statistics. Every community runs these systems, and the certifications climb a four-class ladder that follows you between employers.
The exam-day and study kit
TI-30XS MultiView calculatorThe workhorse scientific calculator for formula-sheet math
TI-30XIIS calculatorThe simpler backup that many testing rooms allowConfirm your state's calculator policy in its candidate information before exam day. The full kit page.
The operator math sheet
One printable page: the exam format, the formula-first drill method, and the unit-conversion discipline that decides the math questions. Free.
No spam. One useful sheet and occasional notes.