REHS SAMPLE EXAM QUESTIONS 1 2026
PRACTICE QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES
REGISTERED ENVIRONMENTAL HEALTH
SPECIALIST STUDY GUIDE
Chlorine - CORRECT ANSWER-What can be used to disinfect water that is
not chemically polluted or extremely polluted?
A lawsuit against an item of property, not against a person (in personam).
An action in rem is a proceeding that takes no notice of the owner of the
property but determines rights in the property that are conclusive against
all the world. - CORRECT ANSWER-what does "in rem" mean?
Dry cleaning - CORRECT ANSWER-What is trichloroethylene used for?
Dumping in the ocean. - CORRECT ANSWER-What is not an allowable
sludge disposal method?
Dumping in the ocean - CORRECT ANSWER-What is not an allowable
sludge disposal method?
, They are explosive and a health hazard. Methane is explosive at 5 to 15
percent. - CORRECT ANSWER-Why are methane and carbon monoxide
monitored in landfills?
Paper products - CORRECT ANSWER-What is the major constituent of
land fills?
It contains a starch additive that provides food for microorganisms. -
CORRECT ANSWER-Why is biodegradable plastic good for landfills?
Two feet. - CORRECT ANSWER-What is the final cover depth of soil over
a sanitary landfill?
Water that is acidic, or has low pH. Water from deep wells tend to be more
acidic, and in some city water supplies, a buffer is added to raise the pH.
Acidic water causes more damage to the pipes. - CORRECT ANSWER-
What is aggressive water?
What are the optimal conditions for composting? - CORRECT ANSWER-
Oxygen
Moisure - 40% to 60%
Temp - at least 131 F for three days (WHO reccomends 140 F) for pathogen
destructions
carbon/nitrogen levels 25 to 35
PRACTICE QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES
REGISTERED ENVIRONMENTAL HEALTH
SPECIALIST STUDY GUIDE
Chlorine - CORRECT ANSWER-What can be used to disinfect water that is
not chemically polluted or extremely polluted?
A lawsuit against an item of property, not against a person (in personam).
An action in rem is a proceeding that takes no notice of the owner of the
property but determines rights in the property that are conclusive against
all the world. - CORRECT ANSWER-what does "in rem" mean?
Dry cleaning - CORRECT ANSWER-What is trichloroethylene used for?
Dumping in the ocean. - CORRECT ANSWER-What is not an allowable
sludge disposal method?
Dumping in the ocean - CORRECT ANSWER-What is not an allowable
sludge disposal method?
, They are explosive and a health hazard. Methane is explosive at 5 to 15
percent. - CORRECT ANSWER-Why are methane and carbon monoxide
monitored in landfills?
Paper products - CORRECT ANSWER-What is the major constituent of
land fills?
It contains a starch additive that provides food for microorganisms. -
CORRECT ANSWER-Why is biodegradable plastic good for landfills?
Two feet. - CORRECT ANSWER-What is the final cover depth of soil over
a sanitary landfill?
Water that is acidic, or has low pH. Water from deep wells tend to be more
acidic, and in some city water supplies, a buffer is added to raise the pH.
Acidic water causes more damage to the pipes. - CORRECT ANSWER-
What is aggressive water?
What are the optimal conditions for composting? - CORRECT ANSWER-
Oxygen
Moisure - 40% to 60%
Temp - at least 131 F for three days (WHO reccomends 140 F) for pathogen
destructions
carbon/nitrogen levels 25 to 35
