Maryland Water/Wastewater Operator Vocabulary Game
Exam terms with clues and explanations by OpenExamPrep.
About the Maryland Water/Wastewater Operator Vocabulary Game
A free word game for the Maryland Water/Wastewater Operator exam. Each round shows a clue for one of 20 exam terms across 7 topics. Recall the term, spell it out, then read a short explanation. Rounds pick a random term, so you can keep playing as long as you like.
How to Play
- 1Read the clue and type a term with the right number of letters (3 to 6). Abbreviations count: type the letters only.
- 2Press Check Answer or Enter. Each letter changes color to show how close you are.
- 3You have 6 tries. Stuck? Need a hint? asks the AI tutor for a nudge without giving the term away, and Skip moves to a new term.
- 4After the round, read the explanation, ask the AI to explain it, share your result, or press Next.
- ARight letter, right spot
- AIn the term, wrong spot
- ANot in the term
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Topics in the Maryland Water/Wastewater Operator Vocabulary Game
Drinking water treatment
Source water
Laboratory analysis
Equipment operation
Safety and administration
Wastewater treatment
State certification
Sources for these terms (19)
- 5.2 Dissolved Oxygen and Biochemical Oxygen Demand (Monitoring & Assessment, EPA archive) · Source checked 2026-11-04
- Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts Rules · Source checked 2026-11-04
- Evaluation of Energy Conservation Measures for Wastewater Treatment Facilities (EPA 832-R-10-005, September 2010) · Source checked 2026-11-04
- Glossary of Acronyms & Technical Terms (EPA archive) · Source checked 2026-11-04
- What is a Wastewater Lagoon? (EPA 832-F-25-009, July 2025) · Source checked 2026-11-04
- National Primary Drinking Water Regulations · Source checked 2026-11-04
- Optimize Your Wastewater Plant Operations; Save Energy - Save Money; Reduce Nutrient Discharge (EPA webinar, October 21, 2021) · Source checked 2026-11-04
- Wastewater Technology Fact Sheet: Package Plants (EPA 832-F-00-016, September 2000) · Source checked 2026-11-04
- Our Current Understanding of the Human Health and Environmental Risks of PFAS · Source checked 2026-11-04
- Primary Clarifiers (EPA Operator Webinar Series, August 24, 2023) · Source checked 2026-11-04
- EPA Needs to Determine What Barriers Prevent Water Systems from Securing Known SCADA Vulnerabilities (EPA OIG Report 2005-P-00002, January 6, 2005) · Source checked 2026-11-04
- Overview of Drinking Water Treatment Technologies · Source checked 2026-11-04
- 5.5 Turbidity (Monitoring & Assessment, EPA archive) · Source checked 2026-11-04
- About Us (Maryland Department of the Environment) · Source checked 2026-11-04
- COMAR 26.06.01 - General Regulations (Waterworks and Waste Systems Operators) · Source checked 2026-11-04
- 1910.147 - The control of hazardous energy (lockout/tagout) · Source checked 2026-11-04
- 1910.132 - General requirements (Personal Protective Equipment) · Source checked 2026-11-04
- Library of Maryland Regulations - Code of Maryland Regulations (COMAR) · Source checked 2026-11-04
- Board of Waterworks and Waste System Operators (Maryland Department of the Environment) · Source checked 2026-11-04
About the MD Water Operator Exam
Maryland's State Board of Waterworks and Waste Systems Operators, part of MDE, certifies water treatment, water distribution, wastewater treatment, wastewater collection and industrial wastewater operators by class. Applicants must hold an Operator-in-Training or other valid certificate, pass the exam for their category and class, and meet education and experience requirements. Effective July 1, 2025, all operators must complete EPA's Cybersecurity Training for Water and Wastewater Systems for renewal.
Exam sponsor: Maryland Department of the Environment (MDE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Assessment
Question count varies by exam level
Time Limit
Not published
Passing Score
69.5%
Exam / Certification Fees
$50 Board exam fee (plus a PSI fee for computer-based exams)
Exam sponsor websiteFees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Frequently Asked Questions
Is the MD Water Operator vocabulary game free?
Yes. The game is free to play with no sign-up. Signing in adds AI explanations for any term.
How does the MD Water Operator vocabulary game work?
Each round shows a clue for one of 20 MD Water Operator terms. Guess the term in six tries: green means the right letter in the right spot, yellow means the letter is in the term but in another spot, and gray means it is not in the term. After the round, read the explanation and play the next term.
Where do the MD Water Operator terms come from?
OpenExamPrep researched each term from the Maryland Department of the Environment (MDE) content outline and primary sources, listed under Sources on this page. The game is independent study material, not an official exam resource.
Who administers water operator certification in Maryland?
The State Board of Waterworks and Waste Systems Operators, part of the Maryland Department of the Environment (MDE), certifies operators in water treatment, water distribution, wastewater treatment, wastewater collection and industrial wastewater works. The Board admits an applicant to an exam only after issuing a certificate such as the Operator-in-Training (OIT) certificate.
What score do I need to pass the Maryland water operator exam?
COMAR 26.06.01.10 sets the passing score at a minimum of 69.5 percent. Exam length depends on the certificate category and class; MDE's Wastewater 5A study guide, for example, lists 125 questions.