REHS Exam (2023/ 2024 Update) 500+
Questions and Verified Answers| 100%
Correct
Q: Which of the following is correct regarding the Lead and Copper contaminants?
A. Lead and copper are common source water contaminants
B. The MCL for lead is 0.015 mg/L
C.Lead sampling is done in the home on 1 liter first draw water samples that have been stagnant
at least 6 hours in the pipe
D. Lead and copper are treated by coagulation
Answer:
C.Lead sampling is done in the home on 1 liter first draw water samples that have been stagnant
at least 6 hours in the pipe
Q: Which statement is correct regarding Drinking Water supplies?
A. They are a significant contributor to cancer risks in the population due to disinfection byproducts
B. They should be disinfected to become sterile so that no bacteria are present in the water
C. They always have the potential risk of microbial contamination that must be managed and
prevented
Answer:
C. They always have the potential risk of microbial contamination that must be managed and
prevented
Q: Why are indicator organisms rather than individual pathogens usually used as standards for
water quality management?
A. Indicators are easier and less expensive to monitor water quality
B. It would be necessary to monitor for dozens of individual pathogens
C. It is generally not necessary to know which specific pathogens might be present in the source
water, but just that they are being controlled
D. All of the above
Answer:
D. All of the above
Q: Bacteria with the ability to live under both aerobic and anaerobic conditions are called:
A. facultative bacteria
B. obligate bacteria
C. anoxic aerobic bacteria
D. non-facultative bacteria
Answer:
A. facultative bacteria
Q: The difference between the initial dissolved oxygen in a sample of water and the dissolved
oxygen in a duplicate sample after a stated period of time is referred to as:
A. Biochemical Oxygen Demand
B. Chemical Oxygen Demand
C. Total Suspended Solids
D. Total Nitrogen
Answer:
A. Biochemical Oxygen Demand
Q: Which of the following is not a disease/infection associated with drinking contaminated
water?
A. Hep A
B. Hep D
C. Typhoid Fever
D. Dysentery
Answer:
B. Hep D
Q: Nitrogen, Phosphorous, and Ammonia are chemical compounds that are commonly found in
wastewater and are capable of contaminating groundwater supplies and aquatic environments.
Collectively, these compounds are often referred to as:
A. nutrients
B. redoximorphs
C. refractory organics
D. supplements
Answer:
A. nutrients
Q: Which of the following measurements of water pollution is considered the best singlestrength measure of polluted water containing degradable wastes?
A. Fecal Coliforms
B. Total Nitrogen
C. TSS
D. BOD
Answer:
D. BOD
Q: Water quality classifications as assigned by the US EPA and the states are based on:
A. size of local wastewater treatment facilities
B. the percentage of fresh vs. salt water available in a particular watershed
C. the best overall usage of the water based on stream flow, quality, and desired use
D. none of the above
Answer:
C. the best overall usage of the water based on stream flow, quality, and desired use
Q: The _ prohibits the discharge of pollutants into US waters without a permit issued by EPA
or the states.
A. NPDES
B. NRCS
C. USGS
D. SWCS
Answer:
A. NPDES
Q: The natural aging process of lakes and reservoirs is called:
A. mesotrophication
B. autotrophication
C. oligotrophication
D. eutrophication
Answer:
D. eutrophication
Q: Nutrients associated with eutrophication include all of the following except:
A. organic carbon
B. nitrogen
C. phosphates
D. potassium
Answer:
D. potassium
Q: Aerobic bacteria require all of the following nutrients for their life process except?
A. phosphorous
B. nitrogen
C. Magnesium
D. carbon
Answer:
C. Magnesium
Q: Primary treatment of wastewater is primarily a _ process
A. chemical
B. physical
C. biological
REHS Exam (Latest 2023/ 2024 Update)
Questions and Verified Answers| 100%
Correct |Grade A
Q: Which of the following is non-toxic to aquatic organisms, a good viricide, and adds oxygen
to treated
wastewater effluents?
a. ozone
b. calcium hypochlorine
c. sulfur dioxide
d. chlorine dioxide
Answer:
ozone
Q: The typical limitation of use of the septic tank absorption field system is due to
a. cost
b. land use considerations
c. soil type and size requirements
d. appearance
Answer:
soil type and size requirements
Q: Which of the following is true about disposal of animal wastes?
a. If wet manure is plowed under, fly eggs present will not hatch.
b. Composting of manure takes advantage of the inclination that larvae move out and away from
moist
manure in search of a dry place to pupate.
c. Where a small number of animals are kept, the manure should be collected once a week.
d. Odors associated with the handling and disposal of these wastes do not determine the disposal
method
or its location.
Answer:
composting of manure takes advantage of the inclination that larvae move out and away from
moist manure in search of a dry place to pupate
Q: Resource recovery and reduction of solid wastes should start
a. at the point of generation
b. at the sanitary landfill
c. in the home
d. at the transfer station
Answer:
at the point of generation
Q: ______can be recovered from refuse by burning it in a refractory lined incineration or
water-wall incinerator.
a. glass
b. aluminum
c. ferrous metal
d. energy
Answer:
energy
Q: Incinerators are rated in terms of
a. percent fuel capacity per day
b. BTU’s per day
c. tons of burnable waste per day
d. cubic feet of solid waste per day.
Answer:
tons of burnable waste per day
Q: The three essentials for combustion in an incinerator are
a. temperature, time and heat
b. time, temperature and moisture
c. temperature, heat and fuel
d. time, temperature and turbulence
Answer:
time, temperature and turbulence
Q: The second step of the combustion process in an incinerator requires a high temperature of
at least
a. 1500o to 1600oF
b. 1500o to 1800o F
c. 1900o to 2000o F
d. 1800o to 1900o F
Answer:
1500 to 1800 F
Q: A landfill site should not
a. be located near a major highway
b. be given and attractive entrance and approach road
c. house equipment on site
d. be inexcessible during bad weather conditions
Answer:
be inexcessible during bad weather conditions
Q: Determining what a landfill can be used for when completed should be planned
a. when the landfill is half full
b. before you build the landfill
c. when the landfill is full
d. any time during the operation of the landfill
Answer:
before you build the landfill
Q: Hazardous waste is governed by the
a. Clean Air Act
b. Occupational Safety and Health Act
c. Resource and Conservation and Recovery Act
d. Food and Drug Act
Answer:
Resource and Conservation and Recovery Act
Q: Which of the following is not a characteristic of hazardous waste?
a. ignitability
b. corrosivity
c. reactivity
d. combustibility
Answer:
combustibility
Q: The EPA requires that dioxin-bearing wastes be __ destroyed or reduced before
disposal in a secure
hazardous waste landfill.
a. 99.99 percent
b. 95.00 percent
c. 99.9999 percent
d. 0.05 percent
Answer:
99.9999 percent
Q: When two pollutants are combined, the effects are greater than the sum of the individual
effects. This is
called?
a. commensalism
b. synergism
REHS 2023/ 2024 Exam| Questions and
Verified Answers| 100% Correct |Grade A
(Latest Update)
Q: To prepare a solution of 100 mg per liter available chlorine, _ of 5.25% bleach with one
gallon of water should be used.
a. 0.5 oz
b. 1.0 oz
c. 0.33 oz
d. 0.25 oz
Answer:
0.25 oz
Q: The detention time for waste water in a septic tank is recommended to be
a. 6 to 12 hours
b. 24 to 72 hours
c. 1 week
d. none of the above
Answer:
24 to 72 hours
Q: One of the most important factors contributing to disease transmission of microbiological
agents is
a. chlorination
b. concentration or dose of microorganisms
c. filtration
d. flocculation
Answer:
concentration or dose of microorganisms
Q: 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
Answer:
cation exchange capacity
Q: The NODAK system is designed to
a. protect groundwater
b. decrease surface area
c. all evaporation of most liquids
d. none of the above
Answer:
protect groundwater
Q: What two factors determine the groundwater contamination potential from a septic tank?
a. size of tank and depth of groundwater
b. contaminants in tank and soil characteristics
c. permeability of septic tank materials and soil characteristics
d. soil characteristics and depth to groundwater
Answer:
soil characteristics and depth to groundwater
Q: Detention time for septic tanks should be not less than
a. 8 hours
b. 12 hours
c. 24 hours
d. 36 hours
Answer:
24 hours
Q: Which of the following is not a factor in the satisfactory operation of a septic tank/sand filter
system?
a. rate of sewage application
b. effectiveness of sand
c. ratio of septic tank size to sand filter size
d. uniformity coefficient sand
Answer:
ratio of septic tank size to sand filter size
Q: What is considered to be the best single strength measure of wastewater polluted water
containing degradable waste?
a. DO
b. 5 day BOD
c. COD
d. total coliform
Answer:
5 day BOD
Q: What is the permissible hour threshold limit value for H2S?
a. 10 ppm
b. 20 ppm
c. 30 ppm
d. 40 ppm
Answer:
20 ppm
Q: The 5 day BOD test should be performed when
a. measuring the concentration of suspended solids in wastewater
b. determining the bacteriological quality of drinking water
c. conducting a series of tests to determine the degree of water pollution
d. requiring more rapid results than can be obtained by using the COD test
Answer:
conducting a series of tests to determine the degree of water pollution
Q: The roentgen is a measure of ionization in air produced by exposure to
a. x-rays or gamma rays
b. alpha particles
c. beta particles
d. all of the above
Answer:
x-rays or gamma rays
Q: Lasers emit
a. mechanical radiation
b. ionizing radiation
c. electromagnetic radiation
d. none of the above
Answer:
electromagnetic radiation
REHS/RS Exam (Latest 2023/2024) Complete
Questions and Verified Answers| 100%
Correct| Grade A
Q: What is the most common level used in a sound level meter?
Answer:
Level A
Q: Sound can be controlled by which of the following ways?
Answer:
Turning off or stopping the sound, Shielding (choose ALL OF THE ABOVE)
Q: Which organization regulates that the structure of a house is properly constructed?
Answer:
HUD
Q: What is NOT a characteristic of a common house fly?
Answer:
They feed on solid foods
Q: What is the recommended temperature for a hospital laundry?
Answer:
160 degrees
Q: Which is the most common type of cock roach?
Answer:
German
Q: What is the spacing required for public beaches?
Answer:
50 square feet
Q: What is the proper spacing for hospital beds to be laid out foot to head?
Answer:
Salvato says: 4 feet apart and 1 foot away from the wall ( answers on test to choose from, 3 feet
is best for placement of head to foot and 5 feet which is best for placement of bed next to one
another).
Q: Emergency Shelters require how much space?
Answer:
30 square feet per person
Q: When a sewer line and a fresh water line come into contact with one another what is it
called?
Answer:
Cross Connection
Q: What is used inside the home to block the passage of sewer gases into the home?
Answer:
P Trap (on plumbing fixtures)
Q: What is the direction of wind associated with the operation of a sanitary landfill?
Answer:
WITH the prevailing winds.
Q: What is considered to be NOT overcrowding?
Answer:
1.5 people to a room
Q: A home provides all EXCEPT what to the homeowner/renter?
Answer:
Protection from accidents
Q: Which is considered NOT a violation under HUD’s housing code?
Answer:
Unpainted interior walls
Q: What should NOT be used to clean surfaces in a food facility?
Answer:
Phenols
Q: If a building is to be found to have Sick Building Syndrome, what is the first thing you
should do?
Answer:
Evacuate the building
Q: What is the most common carrier for Dengue fever?
Answer:
Mosquito
Q: What is one of the major uses of the JIC (Joint Information Center)?
Answer:
Open communication with the public (to ensure coordination of public information during
incidents that involve multiple organizations).
Q: Which is least likely to transmit diseases?
Answer:
Soil
Q: How far (what depth) can flies penetrate compacted soil?
Answer:
6 inches (5 feet un-compacted)
REHS Questions and Verified Answers|
100% Correct |Grade A (Latest 2023/ 2024
Update)
Q: The fresh water supply line to the pool must:
a. have a direct solid connection to the public water supply
b. fill to the pool through an approved air gap
c. have an approved pump hooked to the public water supply line to suck the water to the pool
for fast fills
d. none of the above
Answer:
fill to the pool through an approved air gap
Q: In large pools with outlets more than 5 feet from the end wall, pool inlets should be located
every:
a. 30 feet
b. 10 feet
c. 20 feet
d. 5 feet
Answer:
20 feet
Q: Pool inlets should be located a minimum of 10 inches to 15 inches below the water line to:
a. ensure good mixing
b. prevent clogging
c. prevent loss of disinfectant
d. ensure mixing of pH additives poured into the pool
Answer:
prevent loss of disinfectant
Q: When chlorine is added to water:
a. one acid is formed
b. two acids are formed
c. HCL is considered the primary product
d. ozone is produced in large quantities
Answer:
one acid is formed
Q: The connection between the pool drain and the sanitary sewer must:
a. be solid copper no less than 3 inches in diameter
b. be solid cast iron or NSF approved PVC
c. have a properly located cleanout
d. be provided with an air gap no less than 2 pipe diameters of the discharge pipe
Answer:
be provided with an air gap no less than 2 pipe diameters of the discharge pipe
Q: If an REHS receives a complaint about an abandoned swimming pool that is green colored
and has mice, what should he or she do first?
a. verify with an inspection
b. contact another agency and discuss the details
c. discuss code with complainant, dismiss the complaint
d. catch the mice
Answer:
verify with an inspection
Q: Lighting, circuits and nearby receptacles should be protected by ground-fault circuitinterupters are required to help prevent __.
Answer:
Electrocution
Q: _ is used to reduce the chlorine loss by protecting the free chlorine in the pool from
the sun’s ultraviolet rays, reducing the amount of chlorine needed to maintain proper sanitizer
levels.
Answer:
Cyanuric Acid
Q: In Utah, concentration of cyanuric acid in the water must be at least __ milligrams per liter,
but may not exceed 100 mg per liter
Answer:
10, 100
Q: Areas exposed to high levels of sunlight should maintain – ppm cyanuric acid
Answer:
60-80
Q: Under normal sunlight conditions – ppm cyanuric acid should be maintained
Answer:
30-50
Q: Diarrhea in a pool, chlorine level is raised to what and for how long?
a. 3 ppm, 19 minutes
b. 20 ppm, 12.75 hours
c. 7 ppm, 120 hours
d. 10 ppm, 72 hours
Answer:
20 ppm, 12.75 hours
Q: Which chemical will lower pH in a pool?
a. ozone
b. dichlor
c. trichlor
d. calcium hypochlorite
Answer:
trichlor
Q: Which is the slowest pool filter?
Answer:
Cartridge
Q: What is best for a leaking septic tank?
a. replace every 5 years
b. cover with a metal lining
c. inject seams with an epoxy resin
Answer:
inject seams with an epoxy resin
Q: Common causes of failure of septic tank seepage field systems include improper sizing, nonsuitable soil, non-servicing, and:
REHS/RS Exams Compilations (Latest
2023/2024) Questions and Verified Answers|
100% Correct| Grade A Guaranteed
Q: What is the horizontal part of the stairs you step on called?
Answer:
Tread
Q: What is the term for a statistical estimate of an oral dose of a chemical that produces a lethal
effect on half of an animal population?
Answer:
LD 50
Q: Rocky Mountain spotted fever is spread by:
Answer:
Ticks
Q: Psittacosis is MOST commonly spread by:
Answer:
Pigeons
Q: When two pollutants are combined, the effects are greater than the sum of the individual
effects. This is called:
Answer:
Synergism
Q: Which of the following is MOST effective for controlling ragweed?
Answer:
2,4-D
D-Dichlorophenoxyacetic acid
Q: One of the FIRST actions an individual should take upon hearing an order for the evacuation
of homes and businesses is turn off the:
Answer:
Public Utility services to the building
Q: What are the peak seasons for rats to breed in temperate zones?
Answer:
Spring and Fall
Q: In emergency situations, when the water is turbid or colored but not chemically
contaminated, the chlorine dosage should be:
Answer:
Doubled
Q: The difference between a disaster and terrorism is best described as:
Answer:
Intent
Q: Chemicals that have been used for pool disinfection include chlorine, chloro-iso-cyanurates,
bromine, and:
Answer:
I (Iodine)
Q: A swimming pool filtration system should filter the entire volume of water at MINIMUM of
every:
Answer:
6 hours
Q: Due to the large quantity of floating organisms and materials, the gutters or skimmers
should receive what MINIMUM percent of the total pool water?
Answer:
60%
Q: Approved emergency response plans at nuclear electric power plan sites must be tested AT
LEAST every:
Answer:
2 years
Q: Swimming pool water clarity is measured in terms of NTU or Nephelometer Turbity Unity.
It is recommended that a level of 0.5 NTU:
Answer:
Shall not be exceeded
Q: The interval between exposure to an infectious agent and the appearance of the first
symptom is called:
Answer:
Incubation period
Q: An infected organism that does not exhibit symptoms during the spread of an illness is
called a:
Answer:
Carrier
Q: What is the usual mode of infection from Salmonella?
Answer:
Ingestion of contaminated food
Q: Which one of the following pesticides can be legally used in the United States by the public?
Answer:
Diazinon
Q: All of the following are used to disinfect water EXCEPT:
- Chlorine (Cl)
- Bromine (Br)
- Iodine (I)
- Fluorine (F)
REHS Exam (2023/ 2024 New Update) Study
Guide Questions with Verified Answers|
100% Correct| Grade A Guaranteed
Q: What is radon?
Answer:
A colorless, odorless gas that is released by radium from uranium in most soils and rocks
Q: What does radon emit?
Answer:
Alpha particles
Q: What is the level of radon in which the EPA states to take action
Answer:
4 pCi/L
Q: What are the daughter products of radon?
Answer:
Polonium, lead, and bismuth
Q: Where would you place a radon detector in a school?
Answer:
Ground level classroom or basement classroom
Q: How many steps are there for keeping a healthy home?
Answer:
7
Q: How far above the roof pitch does the chimney need to be?
Answer:
2 feet above the pitch of roof to prevent downdraft. The 2 foot, 10 foot 3 foot rule indicates that
the chimney must be at least 2 feet taller than any structure within 10 feet of it
Q: What is the most common bedbug?
Answer:
Cimex lectularius
Q: What are the prevailing winds?
Answer:
The direction from which the blows
Q: What is the Clean Air Act of 1970?
Answer:
It is the comprehensive federal law that regulates air emissions from stationary and mobile
sources. The law authorizes the EPA to establish (NAAQS) to protect health and public welfare
and to regulate emissions of hazardous air pollutants.
Q: What are the critical air pollutants?
Answer:
Carbon monoxide, lead, nitrogen dioxide, ozone, sulfur dioxide and particulate matter
Q: What is mesothelioma?
Answer:
An aggressive and deadly cancer. It can take 20 to 40 years or more for mesothelioma to develop
after asbestos exposure
Q: What is the a problem associated with vacuum cleaners in a hospital?
Answer:
They release particulates in the air
Q: What is silicosis?
Answer:
Q: What is the formaldehyde indoor air exposure guideline?
Answer:
0.1 ppm
Q: What level can formaldehyde causes symptoms?
Answer:
1.0-5.0 ppm
Q: What uses tricholoethylene and tetrachloroethylene?
Answer:
Chemicals uses in dry cleaning
Q: How is ozone formed?
Answer:
Chemical reaction between oxides of nitrogen and volatile organic compounds in the presence of
sunlight
Q: What causes acid rain?
Answer:
Chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxide are
released into the air. These substances can rise very high into the atmosphere, where they mix
and react with water, oxygen, and other chemicals to form acidic pollutants
Q: What device measures humidity?
Answer:
Hygrometer
Q: What is absolute humidity?
Answer: