DRINKING WATER TREATMENT
PRACTICE EXAM (OHIO CLASS 1)
QUESTIONS AND ANSWERS. VERIFIED
2026.
Many sources of water are directly suitable for drinking purposes without treatment
True
False - ANS False
Water treatment plant operators have the responsibility for the health and well-being of the
community they serve.
True
False - ANS True
What is the purpose of coagulation-flocculation?
A. To control corrosion
B. To filter out suspended particles
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, C. To gather together fine, light particles to form floc to aid the sedimentation and filtration
processes.
D. To settle out larger suspended particles - ANS C. To gather together fine, light particles to
form floc to aid the sedimentation and filtration processes.
What is the purpose of filtration?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the sedimentation and filtration
processes.
D. To settle out larger suspended particles - ANS B. To filter out suspended particles
What is the main purpose of a water treatment plant's intake structure?
A. To draw in water while preventing leaves and other debris from clogging or damaging pumps
B. To ensure fish passage without undue harm to the fishery.
C. To provide a structure for housing the low head influent pumps.
D. To take in excess water from the raw water source - ANS A. To draw in water while
preventing leaves and other debris from clogging or damaging pumps
Smaller sized particles, such as bacteria and fine clays and silts, readily settle out of water
True
False - ANS False
Overdosing as well as underdosing of coagulants may lead to reduced solids removal efficiency.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
PRACTICE EXAM (OHIO CLASS 1)
QUESTIONS AND ANSWERS. VERIFIED
2026.
Many sources of water are directly suitable for drinking purposes without treatment
True
False - ANS False
Water treatment plant operators have the responsibility for the health and well-being of the
community they serve.
True
False - ANS True
What is the purpose of coagulation-flocculation?
A. To control corrosion
B. To filter out suspended particles
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, C. To gather together fine, light particles to form floc to aid the sedimentation and filtration
processes.
D. To settle out larger suspended particles - ANS C. To gather together fine, light particles to
form floc to aid the sedimentation and filtration processes.
What is the purpose of filtration?
A. To control corrosion
B. To filter out suspended particles
C. To gather together fine, light particles to form floc to aid the sedimentation and filtration
processes.
D. To settle out larger suspended particles - ANS B. To filter out suspended particles
What is the main purpose of a water treatment plant's intake structure?
A. To draw in water while preventing leaves and other debris from clogging or damaging pumps
B. To ensure fish passage without undue harm to the fishery.
C. To provide a structure for housing the low head influent pumps.
D. To take in excess water from the raw water source - ANS A. To draw in water while
preventing leaves and other debris from clogging or damaging pumps
Smaller sized particles, such as bacteria and fine clays and silts, readily settle out of water
True
False - ANS False
Overdosing as well as underdosing of coagulants may lead to reduced solids removal efficiency.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
