2024 WATER TREATMENT
OPERATOR LEVEL 1 WATER
OPERATOR CERTIFICATION STUDY
GUIDE SAMPLE EXAM QUESTIONS
WITH ANSWERS
What are the two important factors impacting the effectiveness of
chlorination? - CORRECT-ANSWERSConcentration of chlorine and contact
time
The treatment process that controls corrosion or scaling is known as what? -
CORRECT-ANSWERSStabilization
Permanganate reactions are highly dependent on what factor? - CORRECT-
ANSWERSpH
What precipitates can foul a cation exchange resin? - CORRECT-
ANSWERSIron and manganese
What process works best for sequestering manganese? - CORRECT-
ANSWERSPolyphosphates and chlorine
Adding CO2 to water is known as what? - CORRECT-ANSWERSRecarbonation
What must be done in the ion-exchange softening process once the resin can
no longer soften water? - CORRECT-ANSWERSRegeneration
What type of analysis, under no circumstances, should a composite sample
be collected? - CORRECT-ANSWERSBacteriological
The number of monthly distribution system chlorine residual samples
required is based on what? - CORRECT-ANSWERSSystem size
What is the ideal indicator for pathogens? - CORRECT-ANSWERSColiform
group bacteria
When one substance is dissolved in another and will not settle out, what is
the product called? - CORRECT-ANSWERSA solution
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