ASSE 12080 -Exam Prep Questions with
Solved Solutions 2026/2027 Updated.
Per the [US] CDC, which Legionella diagnostic test allows clinical and environmental isolates to
be compared, to help investigators identify where exposure occurred? - Answer Sputum
culture
Primary factors that affect Legionella growth include all but which of the following:
Temperature, Flow Rate, Pressure, pH - Answer Pressure
In the absence of stagnation, biofilm, and other complexities, Legionella pneumophila will
survive but not multiply in water at what temperature? - Answer 50°C (122°F)
According to the [US] Centers for Disease Control and Prevention, approximately what
percentage of Legionnaires' disease cases among hospital patients are diagnosed? - Answer
10%
In the absence of stagnation, biofilm, and other complexities, Legionella pneumophila will be
dormant (not multiply) in water below - Answer 20°C (68°F)
What is Legionnaires' disease is typically treated with? - Answer antibiotics
The scientific community worldwide largely agrees that the best strategy for preventing
Legionnaires' disease, with current technology, is to: - Answer Manage building water systems
to minimize Legionella bacteria
What are the two most common types of Legionellosis? - Answer Pontiac fever and
Legionnaires' disease
In the absence of stagnation, biofilm, and other complexities, Legionella pneumophila will die
within about 32 minutes in water at what temperature? - Answer 60°C (140°F)
What is the best way to describe Legionella? - Answer bacteria that typically live inside biofilm
or amoebae
Guidelines typically provide practices, instructions, or procedures that are what? - Answer
recommended
,Per the memorandum referencing "QSO-17-30-Hospitals/CAHs/NHs," the US Department of
Health & Human Services, Centers for Medicare and Medicaid Services (CMS), requires that all
but which type of facility implement a water management program to reduce the risk of
Legionella and other opportunistic pathogens: - Answer Outpatient clinics
A(n) ______________ approach to preventing Legionnaires' disease (LD) is to test and disinfect
water systems only after a facility-acquired case of LD is identified rather than managing water
systems to prevent cases. A(n) ________________ approach is to manage water systems to
minimize Legionella. - Answer reactive; proactive
Most cases of Legionnaires' disease are not diagnosed, and many cases that are diagnosed
result in what? - Answer death or long term disabilities.
Per the [US] CDC, to diagnose Legionnaires' disease, sputum for culture should ideally be
obtained __________ antibiotic treatment. - Answer before
What is not an essential component of water management plans developed for the purpose of
controlling Legionella? - Answer Average annual temperature of the water in the fire
protection system
Per the [US] CDC, if indications warrant testing a patient for Legionnaires' disease, it is best
practice to obtain the following: - Answer both sputum for culture and urine for a urinary
antigen test concurrently
Studies have shown that a Legionella infection can be contracted by: - Answer Inhaling or
aspirating into the lungs Legionella bacteria transmitted from water
Many outbreaks of Legionnaires' disease that have been reported in scientific literature were
shown to be associated with what? - Answer Construction projects or water main work
The Legionella urinary antigen test can detect: - Answer only Legionella pneumophila
serogroup 1
Compared to Legionella pneumophila, the optimum temperature range for multiplication is
____________ for Pseudomonas aeruginosa and slightly ____________ for Mycobacteria
avium. - Answer lower; wider
It takes ___ day(s) to get results from a Legionella urinary antigen test and ___ day(s) to get
results from a sputum Legionella culture test. - Answer < 1; > 5
, The [US] CDC defines an outbreak (or cluster) of Legionnaires' disease as ___ or more cases
associated with the same possible source during a ___ month period. For cooling towers, the
duration of time considered for defining an outbreak could be ____________. - Answer 2; 12;
shorter
All but which of the following are required for a water management program team per ASHRAE
188? - Answer availability 24/7/365
Each Legionella control measure must be: - Answer monitored to determine whether it is
performed to a designated standard (control limit)
XYZ Corporation owns four office buildings. Two of the buildings are located in the same city,
about three miles apart, are both 12 stories high, and have nearly identical water systems. The
other two buildings are located in different cities, one of which has 15 stories and the other 22
stories. The corporate director of engineering, who oversees the maintenance of all four
buildings, wants a Legionella water management plan for all four buildings. How many plans will
be required? - Answer Four, one for each building
Legionella water management plans should include: - Answer A list of the team members;
Building water system information and flow diagrams;
One or more validation methods to show the effectiveness of the plan in controlling Legionella;
Verification procedures to ensure the plan is being implemented;
Testing water samples total bacteria (heterotrophic plate count) is an acceptable Legionella
validation method for what type of system? - Answer whirlpool spas
Legionella control measures should be implemented in building water systems and devices that
can harbor and transmit Legionella expect for what system? - Answer fire protection systems
According to the CDC Toolkit titled "Developing a Water Management Program to Reduce
Legionella Growth & Spread in Buildings," the purpose of the toolkit is to help: - Answer
facility personnel develop and implement a water management program to reduce their
building's risk for growing and spreading Legionella
One water management plan can cover several buildings if all are located ________________,
served by the same water supply, and _________________. - Answer on the same campus;
managed by the same personnel
Solved Solutions 2026/2027 Updated.
Per the [US] CDC, which Legionella diagnostic test allows clinical and environmental isolates to
be compared, to help investigators identify where exposure occurred? - Answer Sputum
culture
Primary factors that affect Legionella growth include all but which of the following:
Temperature, Flow Rate, Pressure, pH - Answer Pressure
In the absence of stagnation, biofilm, and other complexities, Legionella pneumophila will
survive but not multiply in water at what temperature? - Answer 50°C (122°F)
According to the [US] Centers for Disease Control and Prevention, approximately what
percentage of Legionnaires' disease cases among hospital patients are diagnosed? - Answer
10%
In the absence of stagnation, biofilm, and other complexities, Legionella pneumophila will be
dormant (not multiply) in water below - Answer 20°C (68°F)
What is Legionnaires' disease is typically treated with? - Answer antibiotics
The scientific community worldwide largely agrees that the best strategy for preventing
Legionnaires' disease, with current technology, is to: - Answer Manage building water systems
to minimize Legionella bacteria
What are the two most common types of Legionellosis? - Answer Pontiac fever and
Legionnaires' disease
In the absence of stagnation, biofilm, and other complexities, Legionella pneumophila will die
within about 32 minutes in water at what temperature? - Answer 60°C (140°F)
What is the best way to describe Legionella? - Answer bacteria that typically live inside biofilm
or amoebae
Guidelines typically provide practices, instructions, or procedures that are what? - Answer
recommended
,Per the memorandum referencing "QSO-17-30-Hospitals/CAHs/NHs," the US Department of
Health & Human Services, Centers for Medicare and Medicaid Services (CMS), requires that all
but which type of facility implement a water management program to reduce the risk of
Legionella and other opportunistic pathogens: - Answer Outpatient clinics
A(n) ______________ approach to preventing Legionnaires' disease (LD) is to test and disinfect
water systems only after a facility-acquired case of LD is identified rather than managing water
systems to prevent cases. A(n) ________________ approach is to manage water systems to
minimize Legionella. - Answer reactive; proactive
Most cases of Legionnaires' disease are not diagnosed, and many cases that are diagnosed
result in what? - Answer death or long term disabilities.
Per the [US] CDC, to diagnose Legionnaires' disease, sputum for culture should ideally be
obtained __________ antibiotic treatment. - Answer before
What is not an essential component of water management plans developed for the purpose of
controlling Legionella? - Answer Average annual temperature of the water in the fire
protection system
Per the [US] CDC, if indications warrant testing a patient for Legionnaires' disease, it is best
practice to obtain the following: - Answer both sputum for culture and urine for a urinary
antigen test concurrently
Studies have shown that a Legionella infection can be contracted by: - Answer Inhaling or
aspirating into the lungs Legionella bacteria transmitted from water
Many outbreaks of Legionnaires' disease that have been reported in scientific literature were
shown to be associated with what? - Answer Construction projects or water main work
The Legionella urinary antigen test can detect: - Answer only Legionella pneumophila
serogroup 1
Compared to Legionella pneumophila, the optimum temperature range for multiplication is
____________ for Pseudomonas aeruginosa and slightly ____________ for Mycobacteria
avium. - Answer lower; wider
It takes ___ day(s) to get results from a Legionella urinary antigen test and ___ day(s) to get
results from a sputum Legionella culture test. - Answer < 1; > 5
, The [US] CDC defines an outbreak (or cluster) of Legionnaires' disease as ___ or more cases
associated with the same possible source during a ___ month period. For cooling towers, the
duration of time considered for defining an outbreak could be ____________. - Answer 2; 12;
shorter
All but which of the following are required for a water management program team per ASHRAE
188? - Answer availability 24/7/365
Each Legionella control measure must be: - Answer monitored to determine whether it is
performed to a designated standard (control limit)
XYZ Corporation owns four office buildings. Two of the buildings are located in the same city,
about three miles apart, are both 12 stories high, and have nearly identical water systems. The
other two buildings are located in different cities, one of which has 15 stories and the other 22
stories. The corporate director of engineering, who oversees the maintenance of all four
buildings, wants a Legionella water management plan for all four buildings. How many plans will
be required? - Answer Four, one for each building
Legionella water management plans should include: - Answer A list of the team members;
Building water system information and flow diagrams;
One or more validation methods to show the effectiveness of the plan in controlling Legionella;
Verification procedures to ensure the plan is being implemented;
Testing water samples total bacteria (heterotrophic plate count) is an acceptable Legionella
validation method for what type of system? - Answer whirlpool spas
Legionella control measures should be implemented in building water systems and devices that
can harbor and transmit Legionella expect for what system? - Answer fire protection systems
According to the CDC Toolkit titled "Developing a Water Management Program to Reduce
Legionella Growth & Spread in Buildings," the purpose of the toolkit is to help: - Answer
facility personnel develop and implement a water management program to reduce their
building's risk for growing and spreading Legionella
One water management plan can cover several buildings if all are located ________________,
served by the same water supply, and _________________. - Answer on the same campus;
managed by the same personnel
