Page 1 of 16
WASTEWATER COLLECTIONS OPERATOR
2026 CERTIFICATION EXAM COMPLETE
CURRENT TESTING (81) QUESTIONS AND
DETAILED CORRECT ANSWERS|TOP-RATED
A+.
WASTEWATER
Prepare for your Wastewater Collections Operator Certification
Exam with this focused study guide. It covers sewer system
operations, collection system maintenance, safety protocols,
hydraulics, and regulatory compliance. Emphasizes
troubleshooting, operational efficiency, and understanding of
wastewater collection principles. Suitable for professionals
preparing for state or regional certification as a wastewater
collections operator.
the most effective means of reducing atmospheric hazards
in a manhole is through the use of ✓ ✓ ...... ANSWER .......
enzymes
chlorinators should be located ✓ ✓ ...... ANSWER .......
in a separate room
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type of gasket to be used on a liquid chlorine line to prevent
leaks ✓ ✓ ...... ANSWER ....... lead
under ordinary atmospheric conditions chlorine gas is ✓ ✓
...... ANSWER ....... greenish- yellow
if a highly toxic substance is discovered in the wastewater
collection system what should be done first ✓ ✓ ......
ANSWER ....... notify downstream facilities
chlorine gas leaks can easily be detected by ✓ ✓ ......
ANSWER ....... passing an open bottle of ammonia along
the underside of the chlorine equipment
carbon dioxide ✓ ✓ ...... ANSWER ....... CO2
Methane ✓ ✓ ...... ANSWER ....... CH4
carbon monoxide ✓ ✓ ...... ANSWER ....... CO
Hydrogen sulfide ✓ ✓ ...... ANSWER ....... H2S
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any trench that is more than ____________ feet deep must be
shored ✓ ✓ ...... ANSWER ....... 5 ft
the process by which water seeps or passes through soil is
called ✓ ✓ ...... ANSWER ....... Percolation
in accordance with good engineering practice, sanitary
sewer lines should be laid at ✓ ✓ ...... ANSWER ....... a
grade that varies with the quantity of wastewater to be
carried and pipe diameter
during the installation of a sewer, which of the following is
not used
a. clamshell
b. draglines
c. front end loader
d. front line shell ✓ ✓ ...... ANSWER ....... d front line
shell
WASTEWATER COLLECTIONS OPERATOR
2026 CERTIFICATION EXAM COMPLETE
CURRENT TESTING (81) QUESTIONS AND
DETAILED CORRECT ANSWERS|TOP-RATED
A+.
WASTEWATER
Prepare for your Wastewater Collections Operator Certification
Exam with this focused study guide. It covers sewer system
operations, collection system maintenance, safety protocols,
hydraulics, and regulatory compliance. Emphasizes
troubleshooting, operational efficiency, and understanding of
wastewater collection principles. Suitable for professionals
preparing for state or regional certification as a wastewater
collections operator.
the most effective means of reducing atmospheric hazards
in a manhole is through the use of ✓ ✓ ...... ANSWER .......
enzymes
chlorinators should be located ✓ ✓ ...... ANSWER .......
in a separate room
, Page 2 of 16
type of gasket to be used on a liquid chlorine line to prevent
leaks ✓ ✓ ...... ANSWER ....... lead
under ordinary atmospheric conditions chlorine gas is ✓ ✓
...... ANSWER ....... greenish- yellow
if a highly toxic substance is discovered in the wastewater
collection system what should be done first ✓ ✓ ......
ANSWER ....... notify downstream facilities
chlorine gas leaks can easily be detected by ✓ ✓ ......
ANSWER ....... passing an open bottle of ammonia along
the underside of the chlorine equipment
carbon dioxide ✓ ✓ ...... ANSWER ....... CO2
Methane ✓ ✓ ...... ANSWER ....... CH4
carbon monoxide ✓ ✓ ...... ANSWER ....... CO
Hydrogen sulfide ✓ ✓ ...... ANSWER ....... H2S
, Page 3 of 16
any trench that is more than ____________ feet deep must be
shored ✓ ✓ ...... ANSWER ....... 5 ft
the process by which water seeps or passes through soil is
called ✓ ✓ ...... ANSWER ....... Percolation
in accordance with good engineering practice, sanitary
sewer lines should be laid at ✓ ✓ ...... ANSWER ....... a
grade that varies with the quantity of wastewater to be
carried and pipe diameter
during the installation of a sewer, which of the following is
not used
a. clamshell
b. draglines
c. front end loader
d. front line shell ✓ ✓ ...... ANSWER ....... d front line
shell
