ABC Wastewater Treatment Operator Class III Vocabulary Game
Exam terms with clues and explanations by OpenExamPrep.
About the ABC Wastewater Treatment Operator Class III Vocabulary Games
4 free word games built on 20 ABC Wastewater Treatment Operator Class III terms across 4 topics. Every game deals terms at random and shows what each term means, so you can keep playing as long as you like.
How to Play
- 1.Read the clue and type the term (3 to 6 letters).
- 2.Green: right spot. Yellow: wrong spot. Gray: not in the term.
- 3.Solve it in 6 tries, then read the explanation.
- 1.Swap two neighboring tiles to line up 3 of the same term.
- 2.Longer lines, two lines at once and chains score more.
- 3.Play until no swap can make a line.
- 1.Flip two cards. A matching pair stays face up.
- 2.Each pair you find shows what the term means.
- 3.Clear the board in as few moves as you can.
- 1.Find each listed term in the letter grid.
- 2.Drag across its letters: across, down or diagonally.
- 3.Find all five as fast as you can.
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Topics in the ABC Wastewater Treatment Operator Class III Vocabulary Game
Equipment operation
Treatment process
Laboratory analysis
Plant administration
Sources for these terms (13)
- Evaluation of Energy Conservation Measures for Wastewater Treatment Facilities · Source checked 2026-11-06
- Wastewater Technology Fact Sheet: Screening and Grit Removal · Source checked 2026-11-06
- Field Measurement of Oxidation-Reduction Potential (ORP) · Source checked 2026-11-06
- Energy Conservation – Wastewater Management Fact Sheet · Source checked 2026-11-06
- Optimize Your Wastewater Treatment Plant: Save Energy (slides) · Source checked 2026-11-06
- Multi-Stage Anaerobic Digestion – Biosolids Technology Fact Sheet · Source checked 2026-11-06
- Denitrifying Filters – Wastewater Technology Fact Sheet · Source checked 2026-11-06
- Primary Clarifiers (EPA Operator Webinar Series slides) · Source checked 2026-11-06
- Glossary of Acronyms & Technical Terms · Source checked 2026-11-06
- NPDES Permit Writers' Manual, Appendix A: Acronyms, Abbreviations and Glossary · Source checked 2026-11-06
- National Pollutant Discharge Elimination System (NPDES) · Source checked 2026-11-06
- Hazard Communication Standard for Chemical Labels and Safety Data Sheets · Source checked 2026-11-06
- 29 CFR 1910.147 – The control of hazardous energy (lockout/tagout) · Source checked 2026-11-06
About the Wastewater Treatment Operator Class III Exam
The WPI (formerly ABC) Wastewater Treatment Operator Class III exam is the third level of the standardized wastewater operator series. It tests equipment evaluation, maintenance and operation; treatment process evaluation and adjustment; laboratory analysis; and security, safety and administrative procedures.
Exam sponsor: Water Professionals International (WPI / formerly ABC). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
100 scored multiple-choice questions plus up to 10 unscored pretest items
Time Limit
Not published
Passing Score
Not published by WPI
Reported exam pass rate: N/A. Pass rates are not publicly reported by WPI/ABC Exam sponsor website
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Frequently Asked Questions
Is the Wastewater Treatment Class III vocabulary game free?
Yes. The game is free to play with no sign-up. Signing in adds AI explanations for any term.
How do the Wastewater Treatment Class III vocabulary games work?
There are 4 games built on 20 Wastewater Treatment Class III terms. In Guess the Term, a clue describes one term and you have six tries to spell it, with green, yellow and gray letters showing how close you are. In Term Match, six terms appear as colored tiles; swap neighbors to line up three or more of the same term, and each match shows what the term means. In Term Pairs, twelve face-down cards hide six pairs of terms; flip two at a time to find each pair, and every pair you find shows what the term means. In Term Search, five terms hide in a grid of letters, reading across, down or diagonally; drag across a term to circle it, and each term you find shows what it means.
Where do the Wastewater Treatment Class III terms come from?
OpenExamPrep researched each term from the Water Professionals International (WPI / formerly ABC) content outline and primary sources, listed under Sources on this page. The game is independent study material, not an official exam resource.
What is the ABC/WPI Wastewater Treatment Operator Class III exam?
It is the third-level standardized multiple-choice exam developed by Water Professionals International (formerly the Association of Boards of Certification, ABC) for wastewater treatment operators. Class III covers medium-to-large treatment systems — commonly those producing 1–10 million gallons per day or serving populations between 10,000 and 50,000. More than 40 state certifying authorities use the WPI/ABC standardized exam series.
How does Class III differ from Class II?
Class II covers small-to-medium conventional plants and emphasizes activated sludge process control, basic nitrification, and routine compliance. Class III adds advanced biological nutrient removal (Bardenpho, A2O, UCT, MBBR, IFAS, MBR), anaerobic digestion with biogas and CHP, sidestream deammonification, tertiary treatment and water reuse, the industrial pretreatment program under 40 CFR Part 403, AWIA cybersecurity and resilience, and supervisory process-control judgment.