Water Operator Class D Study Guide Exam || Most Recent
Exam Actual Complete Real Exam Questions And
Correct Answers (Verified Answers) Already
Graded A+ || Guaranteed Success!! Newest Exam
| Just Released!! 2026-2027
A gallon of water weighs
ANSWERS: 8.34 pounds
1 mg/L of water equals
ANSWERS: 1 ppm by weight
ppm
ANSWERS: part per million
List 5 characteristics of Hydrogen Sulfide
ANSWERS: heavier than air; colorless; flammable; toxic; has a rotten egg odor
,Excessive nitrates in drinking water can cause
ANSWERS: blue baby syndrome in infants
Excessive amounts of fluoride may cause
ANSWERS: mottling/staining of teeth
byproducts of chlorination
ANSWERS: Trihalomethanes THMs; Haloacetic Acids HAAs
Trihalomethanes and Haloacetic Acids may cause problems with (4 health related
items)
ANSWERS: the liver; kidneys; central nervous systems; increase cancer risks
What is the Action level for Copper? (by the Lead and Copper rule)
ANSWERS: 1.3 mg/L
What is the Action level for Lead? (by the Lead and Copper rule)
ANSWERS: .015
, Turbidity limits
ANSWERS: less than or equal to .3 NTU
What is the acceptable Fluoride range in water?
.
ANSWERS: 7 to 1.0 mg/L
Nitrates Limits
ANSWERS: less than or equal to 20mg/L as nitrogen
Dissolved solids limits
ANSWERS: less than or equal to 1000 mg/L
Taste and Color Limits
ANSWERS: less than or equal to 15 units
Aquifer
ANSWERS: underground water-bearing formation yielding useful quantities of
water
, The quantity of water that a formation yields depends on
ANSWERS: the depth, thickness, drawdown and permeability of the formation
What are 2 problems caused by over-pumping include
ANSWERS: falling water levels; subsidence
subsidence
ANSWERS: sinking of the land
the purpose of the well casing and cementing is to
ANSWERS: protect the well from collapse and surface contamination
The purpose of the well screen is to
ANSWERS: reduce/keep sand out of the well
the most important feature of the well screen is
ANSWERS: the size of the openings (mesh size)
Exam Actual Complete Real Exam Questions And
Correct Answers (Verified Answers) Already
Graded A+ || Guaranteed Success!! Newest Exam
| Just Released!! 2026-2027
A gallon of water weighs
ANSWERS: 8.34 pounds
1 mg/L of water equals
ANSWERS: 1 ppm by weight
ppm
ANSWERS: part per million
List 5 characteristics of Hydrogen Sulfide
ANSWERS: heavier than air; colorless; flammable; toxic; has a rotten egg odor
,Excessive nitrates in drinking water can cause
ANSWERS: blue baby syndrome in infants
Excessive amounts of fluoride may cause
ANSWERS: mottling/staining of teeth
byproducts of chlorination
ANSWERS: Trihalomethanes THMs; Haloacetic Acids HAAs
Trihalomethanes and Haloacetic Acids may cause problems with (4 health related
items)
ANSWERS: the liver; kidneys; central nervous systems; increase cancer risks
What is the Action level for Copper? (by the Lead and Copper rule)
ANSWERS: 1.3 mg/L
What is the Action level for Lead? (by the Lead and Copper rule)
ANSWERS: .015
, Turbidity limits
ANSWERS: less than or equal to .3 NTU
What is the acceptable Fluoride range in water?
.
ANSWERS: 7 to 1.0 mg/L
Nitrates Limits
ANSWERS: less than or equal to 20mg/L as nitrogen
Dissolved solids limits
ANSWERS: less than or equal to 1000 mg/L
Taste and Color Limits
ANSWERS: less than or equal to 15 units
Aquifer
ANSWERS: underground water-bearing formation yielding useful quantities of
water
, The quantity of water that a formation yields depends on
ANSWERS: the depth, thickness, drawdown and permeability of the formation
What are 2 problems caused by over-pumping include
ANSWERS: falling water levels; subsidence
subsidence
ANSWERS: sinking of the land
the purpose of the well casing and cementing is to
ANSWERS: protect the well from collapse and surface contamination
The purpose of the well screen is to
ANSWERS: reduce/keep sand out of the well
the most important feature of the well screen is
ANSWERS: the size of the openings (mesh size)
