RS/REHS PRACTICE QUESTIONS 2025/2026: MOST TESTED TOPICS
WITH CORRECT ANSWERS – REGISTERED SANITARIAN /
ENVIRONMENTAL HEALTH SPECIALIST EXAM PREP COVERNG OVER
300 MST TESTED QUESTIONS
COVERS MAJOR DOMAINS INCLUDING FOOD PROTECTION, WATER QUALITY,
WASTEWATER, SOLID AND HAZARDOUS WASTE, VECTOR CONTROL,
OCCUPATIONAL HEALTH, AIR QUALITY, AND PUBLIC HEALTH LAW. FEATURES
PRACTICE QUESTIONS WITH DETAILED EXPLANATIONS, TEST-TAKING
STRATEGIES, AND THE MOST UP-TO-DATE CONTENT BASED ON 2025/2026
EXAM BLUEPRINTS.
_____ is defined as noise induced hearing loss attributed to environmental noise?
a) presbycusis
b) tinnitus
c) cochlea
d) socioacusis - CORRECT ANSWER-d) socioacusis
A "S" trap is not considered legal in most state plumbing codes due to which of the following
factors?
a) they clog easily
b) they are not vented
c) they are unsightly
d) they do not drain - CORRECT ANSWER-b) they are not vented
A 6-mil vapor retarder should be installed below any slab-on-grade foundation or crawlspace of the
home to:
a) control moisture in the crawlspace
b) keep natural gas out of the crawlspace
c) keep underground springs from washing away footers
d) keep insects from eating the wood structure - CORRECT ANSWER-a) control moisture in the
crawlspace
,A biohazard is
a) any material that negatively impacts a biological organism
b) a material of biological composition, especially if infective, that constitutes a threat to people or
their environment
c) a chemical that constitutes a threat to people or their environment
d) any virus that causes fatal disease - CORRECT ANSWER-b) a material of biological composition,
especially if infective, that constitutes a threat to people or their environment
A disease that might result from inhaling dust from bird droppings is
a) dengue fever
b) psittacosis
c) tularemia
d) murine typhus - CORRECT ANSWER-b) psittacosis
A footing drain is required to
a) control moisture
b) eliminate radon
c) keep a foundation from slipping
d) keep the feet dry while pouring concrete - CORRECT ANSWER-c) keep a foundation from slipping
A HACCP plan is not required when
a) smoking foods as a method of preservation
b) cooling and reheating TCS foods in bulk
c) performing reduced oxygen packaging
d) using food additives or adding other components to preserve food or render it non-TCS -
CORRECT ANSWER-b) cooling and reheating TCS foods in bulk
A joist is used
a) to provide bracing for a wall
b) as a horizontal support
c) as a roof only support
,d) as a support for sheet rock - CORRECT ANSWER-b) as a horizontal support
A measure of the probability and severity of adverse effects under specific conditions best describes
a) risk
b) hazard
c) exposure
d) toxicity - CORRECT ANSWER-a) risk
A negative pressure fit test for a protective mask
a) is done by placing both palms against the intake filters
b) is done by placing both hands over the exhalation points
c) should be conducted at a minimum of once a week
d) should be repeated until an air leak is detected - CORRECT ANSWER-a) is done by placing both
palms against the intake filters
A satisfactory method for disinfecting water that is not chemically or grossly polluted with bacteria
is:
a) Chlorination
b) Fluorination
c) Oxygenation
d) CO2 treatment - CORRECT ANSWER-a) Chlorination
A septic tank maintenance worker has checked an empty tank for the presence of hydrogen sulfide
(H2S). The test was negative, and there are no odors indicating the presence of other hazardous
gases. Is the tank safe to enter without a respirator and supplied air?
a) Yes, because hydrogen sulfide and odors were not detected
b) No, because oxygen content and methane were not tested
c) Yes, because the absence of odors and H2S indicates acceptable confined space entry conditions
d) No, because a lack of H2S is a sign of a hazardous confined space atmosphere - CORRECT
ANSWER-b) No, because oxygen content and methane were not tested
A solid waste manager is trying to reduce lead in the solid waste stream. What should be targeted in
the municipal waste stream as a major contributor of lead to the environment?
, a) fluorescent light tubes
b) lead acid batteries
c) household batteries
d) rechargeable batteries - CORRECT ANSWER-b) lead acid batteries
A storm sewer is used to
a) remove rain and other standing surface water
b) remove sewage and storm water
c) remove household water waste and gutter drain water
d) remove non-toxic, non-hazardous wastewater - CORRECT ANSWER-a) remove rain and other
standing surface water
A stud is an element of building construction that is intended as a
a) vertical support
b) horizontal support
c) roof only support
d) support for sheet rock - CORRECT ANSWER-a) vertical support
A swimming pool filtration system should filter the entire volume of water at a minimum of every
a) 2 hours
b) 6 hours
c) 10 hours
d) 13 hours - CORRECT ANSWER-b) 6 hours
A young lake is considered to be
a) eutrophic
b) mesotrophic
c) oligotrophic
d) ohytotrophic - CORRECT ANSWER-c) oligotrophic
WITH CORRECT ANSWERS – REGISTERED SANITARIAN /
ENVIRONMENTAL HEALTH SPECIALIST EXAM PREP COVERNG OVER
300 MST TESTED QUESTIONS
COVERS MAJOR DOMAINS INCLUDING FOOD PROTECTION, WATER QUALITY,
WASTEWATER, SOLID AND HAZARDOUS WASTE, VECTOR CONTROL,
OCCUPATIONAL HEALTH, AIR QUALITY, AND PUBLIC HEALTH LAW. FEATURES
PRACTICE QUESTIONS WITH DETAILED EXPLANATIONS, TEST-TAKING
STRATEGIES, AND THE MOST UP-TO-DATE CONTENT BASED ON 2025/2026
EXAM BLUEPRINTS.
_____ is defined as noise induced hearing loss attributed to environmental noise?
a) presbycusis
b) tinnitus
c) cochlea
d) socioacusis - CORRECT ANSWER-d) socioacusis
A "S" trap is not considered legal in most state plumbing codes due to which of the following
factors?
a) they clog easily
b) they are not vented
c) they are unsightly
d) they do not drain - CORRECT ANSWER-b) they are not vented
A 6-mil vapor retarder should be installed below any slab-on-grade foundation or crawlspace of the
home to:
a) control moisture in the crawlspace
b) keep natural gas out of the crawlspace
c) keep underground springs from washing away footers
d) keep insects from eating the wood structure - CORRECT ANSWER-a) control moisture in the
crawlspace
,A biohazard is
a) any material that negatively impacts a biological organism
b) a material of biological composition, especially if infective, that constitutes a threat to people or
their environment
c) a chemical that constitutes a threat to people or their environment
d) any virus that causes fatal disease - CORRECT ANSWER-b) a material of biological composition,
especially if infective, that constitutes a threat to people or their environment
A disease that might result from inhaling dust from bird droppings is
a) dengue fever
b) psittacosis
c) tularemia
d) murine typhus - CORRECT ANSWER-b) psittacosis
A footing drain is required to
a) control moisture
b) eliminate radon
c) keep a foundation from slipping
d) keep the feet dry while pouring concrete - CORRECT ANSWER-c) keep a foundation from slipping
A HACCP plan is not required when
a) smoking foods as a method of preservation
b) cooling and reheating TCS foods in bulk
c) performing reduced oxygen packaging
d) using food additives or adding other components to preserve food or render it non-TCS -
CORRECT ANSWER-b) cooling and reheating TCS foods in bulk
A joist is used
a) to provide bracing for a wall
b) as a horizontal support
c) as a roof only support
,d) as a support for sheet rock - CORRECT ANSWER-b) as a horizontal support
A measure of the probability and severity of adverse effects under specific conditions best describes
a) risk
b) hazard
c) exposure
d) toxicity - CORRECT ANSWER-a) risk
A negative pressure fit test for a protective mask
a) is done by placing both palms against the intake filters
b) is done by placing both hands over the exhalation points
c) should be conducted at a minimum of once a week
d) should be repeated until an air leak is detected - CORRECT ANSWER-a) is done by placing both
palms against the intake filters
A satisfactory method for disinfecting water that is not chemically or grossly polluted with bacteria
is:
a) Chlorination
b) Fluorination
c) Oxygenation
d) CO2 treatment - CORRECT ANSWER-a) Chlorination
A septic tank maintenance worker has checked an empty tank for the presence of hydrogen sulfide
(H2S). The test was negative, and there are no odors indicating the presence of other hazardous
gases. Is the tank safe to enter without a respirator and supplied air?
a) Yes, because hydrogen sulfide and odors were not detected
b) No, because oxygen content and methane were not tested
c) Yes, because the absence of odors and H2S indicates acceptable confined space entry conditions
d) No, because a lack of H2S is a sign of a hazardous confined space atmosphere - CORRECT
ANSWER-b) No, because oxygen content and methane were not tested
A solid waste manager is trying to reduce lead in the solid waste stream. What should be targeted in
the municipal waste stream as a major contributor of lead to the environment?
, a) fluorescent light tubes
b) lead acid batteries
c) household batteries
d) rechargeable batteries - CORRECT ANSWER-b) lead acid batteries
A storm sewer is used to
a) remove rain and other standing surface water
b) remove sewage and storm water
c) remove household water waste and gutter drain water
d) remove non-toxic, non-hazardous wastewater - CORRECT ANSWER-a) remove rain and other
standing surface water
A stud is an element of building construction that is intended as a
a) vertical support
b) horizontal support
c) roof only support
d) support for sheet rock - CORRECT ANSWER-a) vertical support
A swimming pool filtration system should filter the entire volume of water at a minimum of every
a) 2 hours
b) 6 hours
c) 10 hours
d) 13 hours - CORRECT ANSWER-b) 6 hours
A young lake is considered to be
a) eutrophic
b) mesotrophic
c) oligotrophic
d) ohytotrophic - CORRECT ANSWER-c) oligotrophic
