REHS EVALUATION EXAM 2026 QUESTIONS AND
ANSWERS RATED A+
✔✔11. Which of the following is not considered a satisfactory solution to the problem of
chemical contamination in
Well systems?
a. abandoning the well
b. boiling the water
c. building a new, properly constructed, drilled well - ✔✔boiling the water
✔✔12. Which of the following chemicals is most widely used to destroy
microorganisms?
a. chlorine
b. copper sulfate
c. chloramine
d. hydrogen sulfate - ✔✔chlorine
✔✔13. Which of the following is not a practical method for removal of cadmium?
a. ion exchange
b. lime softening
c. reverse osmosis
d. iron coagulation - ✔✔reverse osmosis
✔✔14. Which of the following is not a commonly accepted method of device to prevent
backsiphonage?
a. vacuum breakers
b. cross-connections
c. air gap separation
d. back pressure units - ✔✔cross-connections
✔✔15. This substance is the first product of the decomposition of organic matter. Its
presence in water usually
Indicates "fresh pollution" of sanitary significance. What is it?
a. ammonia
b. sugar
c. carbon dioxide
d. hydrogen sulfide - ✔✔ammonia
✔✔16. One of the most common reasons for the contamination of wells drilled through
rock, clay, or hardpan is
a. seepage of pollutants through soil
b. failure to seal well casings properly
c. porosity of the rock
d. use of inferior quality well casings - ✔✔failure to seal well casings properly
,✔✔17. In emergencies, small quantities of water can be disinfected by boiling or using
a. aluminum salts
b. tincture of iodine
c. salt tablets
d. direct exposure to sunlight for 22 hours - ✔✔tincture of iodine
✔✔18. Back flow of nonpotable materials into the potable water system may occur by
a. back pressure
b. backsiphonage
c. vacuum in the volume
d. a and b above - ✔✔a and b above
✔✔19. Which of the following statements should not be a consideration in locating a
groundwater supply?
a. the probable travel of pollution through the ground
b. the well construction practices and standards
c. the sanitary seal provided at the point where the pump lines pass out of the casing
d. the distance that the water will need to travel - ✔✔the distance that the water will
need to travel
✔✔20. It is known that some common pathogenic organisms found in wastewater will
survive more than ____
of harsh temperature extremes
a. 2 months
b. 5 months
c. 2 years
d. 5 years - ✔✔2 years
✔✔21. A storm sewer is used to
a. remove rain or 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 - ✔✔remove rain or other standing
surface water
✔✔22. Stream pollution is sometimes apparent by
a. increased levels of available oxygen in the water
b. a zone of degradation
c. large numbers of crayfish and cristivomer species
d. large numbers of small fish - ✔✔a zone of degradation
✔✔23. If the septic tank will also have a garbage disposal unit feeding into it
,a. the size of the tank would be increased by 50 percent
b. the tank should have an agiator
c. the tank should not be equipped with a gas baffle
d. the tank should not be constructed with precast concrete - ✔✔the size of the tank
would be increased by 50 percent
✔✔24. How often should a septic tank for a private home be serviced?
a. every year
b. every 5 to 10 years
c. every 3 to 5 years
d. every 10 years - ✔✔every 3 to 5 years
✔✔25. Plants absorb certain constituents of wastewater, using wastewater for irrigation
of consumable plant products
may present a health hazard to humans if the water contains
a. nitrates
b. iron
c. cadmium
d. chlorides - ✔✔cadmium
✔✔26. A measure of the relativity constant rate at which clear water, maintained at a
relatively constant depth, will
seep out of a standard size test hole that has been previously saturated is the
a. hydraulic conductivity
b. soil permeability test
c. soil percolation test
d. Baird-Parker saturation test - ✔✔soil percolation test
✔✔27. The ability of a soil to absorb and allow water and air to pass through is related
to all of the following except
a. chemical composition
b. texture
c. cation exchange capacity
d. granular structure - ✔✔cation exchange capacity
✔✔28. Bacteria that require oxygen for their growth are called
a. anaerobic bacteria
b. aerobic bacteria
c. viruses
d. fungi - ✔✔aerobic bacteria
✔✔29. The examination of the stool for cysts and/or ova is the common diagnosis for
which food borne pathogen?
, A. Parasitic infections
B. Viral infections
C. Bacterial infections
D. Non-infectious agents
E. None of the above - ✔✔parasitic infections
✔✔30. If you are counseling a pregnant patient, what foods should she avoid to
decrease her risk for listeriosis?
A. Honey
B. Fresh soft cheese
C. Sauerkraut
D. Cooked mushrooms
E. Caffeine - ✔✔fresh soft cheese
✔✔31. Which scenario(s) may present a risk to immunocompromized patients.
A. Animals in the Home Use
B. Coming in contact with individuals after they have been given a live virus vaccine.
C. Eating raw oysters
D. Drinking non-pasteurized juices or unchlorinated water
E. All of the above - ✔✔all of the above
✔✔32. What food borne illness may present with chocolate-brown colored blood?
A. Nitrite poisoning
B. Organophosphate poisoning
C. Botulism
D. Mercury poisoning
E. Tin poisoning - ✔✔nitrite poisoning
✔✔33. Approximately how many people die per year in the U.S. of food-borne illness?
A. 5,000
B. 100
C. 9,000
D. 100,000
E. 50 - ✔✔5,000
✔✔34. In the U.S. the pioneering Pure Food and Drug Act was passed in 1906
stimulated by journalistic exposures of inferior conditions in the food industry and by
Upton Sinclair's 1906 novel titled?
A. Silent Spring
B. The Coming Plague
C. To Kill a Mockingbird
D. The Jungle
ANSWERS RATED A+
✔✔11. Which of the following is not considered a satisfactory solution to the problem of
chemical contamination in
Well systems?
a. abandoning the well
b. boiling the water
c. building a new, properly constructed, drilled well - ✔✔boiling the water
✔✔12. Which of the following chemicals is most widely used to destroy
microorganisms?
a. chlorine
b. copper sulfate
c. chloramine
d. hydrogen sulfate - ✔✔chlorine
✔✔13. Which of the following is not a practical method for removal of cadmium?
a. ion exchange
b. lime softening
c. reverse osmosis
d. iron coagulation - ✔✔reverse osmosis
✔✔14. Which of the following is not a commonly accepted method of device to prevent
backsiphonage?
a. vacuum breakers
b. cross-connections
c. air gap separation
d. back pressure units - ✔✔cross-connections
✔✔15. This substance is the first product of the decomposition of organic matter. Its
presence in water usually
Indicates "fresh pollution" of sanitary significance. What is it?
a. ammonia
b. sugar
c. carbon dioxide
d. hydrogen sulfide - ✔✔ammonia
✔✔16. One of the most common reasons for the contamination of wells drilled through
rock, clay, or hardpan is
a. seepage of pollutants through soil
b. failure to seal well casings properly
c. porosity of the rock
d. use of inferior quality well casings - ✔✔failure to seal well casings properly
,✔✔17. In emergencies, small quantities of water can be disinfected by boiling or using
a. aluminum salts
b. tincture of iodine
c. salt tablets
d. direct exposure to sunlight for 22 hours - ✔✔tincture of iodine
✔✔18. Back flow of nonpotable materials into the potable water system may occur by
a. back pressure
b. backsiphonage
c. vacuum in the volume
d. a and b above - ✔✔a and b above
✔✔19. Which of the following statements should not be a consideration in locating a
groundwater supply?
a. the probable travel of pollution through the ground
b. the well construction practices and standards
c. the sanitary seal provided at the point where the pump lines pass out of the casing
d. the distance that the water will need to travel - ✔✔the distance that the water will
need to travel
✔✔20. It is known that some common pathogenic organisms found in wastewater will
survive more than ____
of harsh temperature extremes
a. 2 months
b. 5 months
c. 2 years
d. 5 years - ✔✔2 years
✔✔21. A storm sewer is used to
a. remove rain or 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 - ✔✔remove rain or other standing
surface water
✔✔22. Stream pollution is sometimes apparent by
a. increased levels of available oxygen in the water
b. a zone of degradation
c. large numbers of crayfish and cristivomer species
d. large numbers of small fish - ✔✔a zone of degradation
✔✔23. If the septic tank will also have a garbage disposal unit feeding into it
,a. the size of the tank would be increased by 50 percent
b. the tank should have an agiator
c. the tank should not be equipped with a gas baffle
d. the tank should not be constructed with precast concrete - ✔✔the size of the tank
would be increased by 50 percent
✔✔24. How often should a septic tank for a private home be serviced?
a. every year
b. every 5 to 10 years
c. every 3 to 5 years
d. every 10 years - ✔✔every 3 to 5 years
✔✔25. Plants absorb certain constituents of wastewater, using wastewater for irrigation
of consumable plant products
may present a health hazard to humans if the water contains
a. nitrates
b. iron
c. cadmium
d. chlorides - ✔✔cadmium
✔✔26. A measure of the relativity constant rate at which clear water, maintained at a
relatively constant depth, will
seep out of a standard size test hole that has been previously saturated is the
a. hydraulic conductivity
b. soil permeability test
c. soil percolation test
d. Baird-Parker saturation test - ✔✔soil percolation test
✔✔27. The ability of a soil to absorb and allow water and air to pass through is related
to all of the following except
a. chemical composition
b. texture
c. cation exchange capacity
d. granular structure - ✔✔cation exchange capacity
✔✔28. Bacteria that require oxygen for their growth are called
a. anaerobic bacteria
b. aerobic bacteria
c. viruses
d. fungi - ✔✔aerobic bacteria
✔✔29. The examination of the stool for cysts and/or ova is the common diagnosis for
which food borne pathogen?
, A. Parasitic infections
B. Viral infections
C. Bacterial infections
D. Non-infectious agents
E. None of the above - ✔✔parasitic infections
✔✔30. If you are counseling a pregnant patient, what foods should she avoid to
decrease her risk for listeriosis?
A. Honey
B. Fresh soft cheese
C. Sauerkraut
D. Cooked mushrooms
E. Caffeine - ✔✔fresh soft cheese
✔✔31. Which scenario(s) may present a risk to immunocompromized patients.
A. Animals in the Home Use
B. Coming in contact with individuals after they have been given a live virus vaccine.
C. Eating raw oysters
D. Drinking non-pasteurized juices or unchlorinated water
E. All of the above - ✔✔all of the above
✔✔32. What food borne illness may present with chocolate-brown colored blood?
A. Nitrite poisoning
B. Organophosphate poisoning
C. Botulism
D. Mercury poisoning
E. Tin poisoning - ✔✔nitrite poisoning
✔✔33. Approximately how many people die per year in the U.S. of food-borne illness?
A. 5,000
B. 100
C. 9,000
D. 100,000
E. 50 - ✔✔5,000
✔✔34. In the U.S. the pioneering Pure Food and Drug Act was passed in 1906
stimulated by journalistic exposures of inferior conditions in the food industry and by
Upton Sinclair's 1906 novel titled?
A. Silent Spring
B. The Coming Plague
C. To Kill a Mockingbird
D. The Jungle
