Water Quality Laboratory Analyst Grade 4 Practice Test
Administered by California-Nevada American Water Works Association (CA-NV AWWA)
The laboratory analyst certification of the California-Nevada section of the American Water Works Association, aimed at drinking water compliance — maximum contaminant levels, state reporting deadlines, and accredited methods.
Current lab employment, an organizational chart, and proof of direct responsible charge of a water quality lab (job description plus supervisor statement).
High school/General Educational Development (GED) + 10 years, associate + 8, bachelor's + 6, or advanced degree + 4.
Able to write and comprehend English; over 18. Post-secondary education substitutes for experience year for year (30 semester or 45 quarter units per year); approved lab training can substitute for formal education.
Grade 4 exam format
Questions: not published by the certifying body
Pass score: not printed here; check the current candidate handbook
Grade 4 sample question
Laboratory management: staffing · an original practice item written only from publicly available sources, not a real exam question
Your lab must analyze 60 samples every working day, and one analyst completes 12 a day. Allowing for 15% absence (leave, training, illness), how many analysts should you staff?
4
5
6
7
Answer and working
C. 6
Analysts needed on any day = 60 ÷ 12 = 5. With 15% absence, only 85% of staff are present on average, so staff = 5 ÷ 0.85 = 5.9, which rounds up to 6. Five covers only a day with no one away; 4 multiplies by 0.85 instead of dividing; 7 counts the absence allowance twice, rounding 5.9 up and then adding another analyst for it.
Grade 4 questions answered
What do I need to sit Water Quality Laboratory Analyst Grade 4?
Current lab employment, an organizational chart, and proof of direct responsible charge of a water quality lab (job description plus supervisor statement). High school/GED + 10 years, associate + 8, bachelor's + 6, or advanced degree + 4.
Who can apply, and can education count as experience?
Able to write and comprehend English; over 18. Post-secondary education substitutes for experience year for year (30 semester or 45 quarter units per year); approved lab training can substitute for formal education.
How many questions are on the Grade 4 exam, and what is the pass score?
Neither figure is printed here: the published documents do not settle them. Check the current candidate handbook before you sit.
What this exam covers
Collect & Preserve Samples
Prepare Samples for Analysis
Analyze Samples & Interpret Results
Operate & Maintain Equipment
Handle Chemicals & Wastes
Quality Assurance & Quality Control
Manage Laboratory
Laboratory Safety
General Science
How to study for it here
Practice quizzes — filter to any topic above and work through it with explanations.
Flashcards — spaced repetition over terms, formulas and regulations.
Mock exam — a timed run at this grade.
Official formula sheet — a link to the sheet the certifying body publishes for this exam, where it publishes one, so you study from the real thing.
Free, no account, and progress stays in your browser.
Topic coverage follows 2020 Certification Candidate Handbook — Water Quality Laboratory Analyst (California-Nevada American Water Works Association, issued 20 October 2020).
Practice questions are written only from publicly available sources
(that outline and the regulations and references it cites); they are
not real exam questions, which are confidential.
Check current application requirements, fees and exam dates on the
certifying body's own page: official certification page.
Questions, flashcards, and explanations are AI-written from publicly available sources only: the exam content outlines and candidate materials each certifying body publishes without restriction, and the regulations and technical references they cite. No confidential material is used, including actual exam questions, recollections of any exam sat by the author, or any handbook or document released under a confidentiality agreement. Content is then put through repeated review — regulatory values checked against primary sources, every calculation recomputed, and errors corrected — plus spot checks by the author, who holds California water operator certifications and a California civil engineering licence. Those spot checks are sampling, not a professional review: nothing here is stamped, sealed, or offered as engineering advice, and not every item has been individually verified, so mistakes can still slip through.