Water Operator Class 3-Practice Test Questions
2025-2026 Most Recent Version Comprehensive
155 Questions and Verified Answers Accurate
Solutions Already Graded A+ Get it 100% Correct
.015 mg/L - CORRECT ANSWER: The action level for lead is?
.3 NTU's or lower 95% of the time - CORRECT ANSWER: The MCL for turbidity is:
.5 and 4 mg/L - CORRECT ANSWER: The minimum chlorine residual at the end of a
line and the maximum chlorine residual allowed at the end of a line is:
0 ppm - CORRECT ANSWER: Water leaving Zeolite softener has a hardness of
0.01 ppm - CORRECT ANSWER: MCL for Arsenic
0.015 ppm - CORRECT ANSWER: MCL for Lead
0.06 ppm - CORRECT ANSWER: MCL for HAA5's
0.08 ppm - CORRECT ANSWER: MCL for TTHM's
0.3, 0.05 - CORRECT ANSWER: SMCL for Iron is. For Manganese:
1 ppm - CORRECT ANSWER: What is the desired amount of fluoride in water?
1 turn - CORRECT ANSWER: A fully open chlorine bottle is how many turns?
, 10 mg/L - CORRECT ANSWER: The MCL for nitrates is?
10 ppm - CORRECT ANSWER: What is the IDHL level for chlorine gas?
1000ft - CORRECT ANSWER: Shut-off valve in main lines should be located ____apart
12 inches - CORRECT ANSWER: A well casing should extend at least ____ above
ground level.
12 inches - CORRECT ANSWER: How high should a well casing extend above ground
level?
150 bottle - CORRECT ANSWER: Chlorine repair kit "A" is used for
1974 - CORRECT ANSWER: The SDWA was signed into law December 19__
2 buffers - CORRECT ANSWER: pH meters must be calibrated using
200 ft - CORRECT ANSWER: Road signs should be no more than ____ apart.
24 inches - CORRECT ANSWER: How high should a vent extend above ground level?
3 ft - CORRECT ANSWER: A ladder should extend how far above the structure that it
accesses?
4 ppm, 2 ppm - CORRECT ANSWER: The PMCL for fluoride is: The SMCL is:
2025-2026 Most Recent Version Comprehensive
155 Questions and Verified Answers Accurate
Solutions Already Graded A+ Get it 100% Correct
.015 mg/L - CORRECT ANSWER: The action level for lead is?
.3 NTU's or lower 95% of the time - CORRECT ANSWER: The MCL for turbidity is:
.5 and 4 mg/L - CORRECT ANSWER: The minimum chlorine residual at the end of a
line and the maximum chlorine residual allowed at the end of a line is:
0 ppm - CORRECT ANSWER: Water leaving Zeolite softener has a hardness of
0.01 ppm - CORRECT ANSWER: MCL for Arsenic
0.015 ppm - CORRECT ANSWER: MCL for Lead
0.06 ppm - CORRECT ANSWER: MCL for HAA5's
0.08 ppm - CORRECT ANSWER: MCL for TTHM's
0.3, 0.05 - CORRECT ANSWER: SMCL for Iron is. For Manganese:
1 ppm - CORRECT ANSWER: What is the desired amount of fluoride in water?
1 turn - CORRECT ANSWER: A fully open chlorine bottle is how many turns?
, 10 mg/L - CORRECT ANSWER: The MCL for nitrates is?
10 ppm - CORRECT ANSWER: What is the IDHL level for chlorine gas?
1000ft - CORRECT ANSWER: Shut-off valve in main lines should be located ____apart
12 inches - CORRECT ANSWER: A well casing should extend at least ____ above
ground level.
12 inches - CORRECT ANSWER: How high should a well casing extend above ground
level?
150 bottle - CORRECT ANSWER: Chlorine repair kit "A" is used for
1974 - CORRECT ANSWER: The SDWA was signed into law December 19__
2 buffers - CORRECT ANSWER: pH meters must be calibrated using
200 ft - CORRECT ANSWER: Road signs should be no more than ____ apart.
24 inches - CORRECT ANSWER: How high should a vent extend above ground level?
3 ft - CORRECT ANSWER: A ladder should extend how far above the structure that it
accesses?
4 ppm, 2 ppm - CORRECT ANSWER: The PMCL for fluoride is: The SMCL is:
