REHS{ Registered Environmental Health Specialist}STUDY
GUIDE – 2025 REGISTERED ENVIRONMENTAL HEALTH
SPECIALIST EXAM PREP WITH 600 VERIFIED QUESTIONS
AND CORRECT ANSWERS WITH MOST TESTED QUESTIONS
THIS RESOURCE PROVIDES COMPREHENSIVE COVERAGE OF KEY TOPICS FOR
THE REGISTERED ENVIRONMENTAL HEALTH SPECIALIST (REHS/RS) EXAM,
INCLUDING FOOD PROTECTION, WATER AND AIR QUALITY, WASTE
MANAGEMENT, VECTOR CONTROL, AND PUBLIC HEALTH LAWS. IT IS DESIGNED
FOR 2025 EXAM CANDIDATES SEEKING TO MASTER ENVIRONMENTAL HEALTH
PRINCIPLES AND ACHIEVE NATIONAL OR STATE CERTIFICATION SUCCESS.
What is a psychrometer used for? - CORRECT ANSWER-TO MEASURE RELATIVE HUMIDITY AND
DEW POINT.
All of these are important for silicosis infection except:
A. Size of dust particle inhaled
B. Amount of dust inhaled
C. Percentage of asbestos in dust
D. Presence of silica in dust - CORRECT ANSWER-C. PERCENTAGE OF ASBESTOS IN DUST
All school playground precautions are important except:
A. Pinching hazards
B. Durability of the ground material
C. Signs with age recommendations of play
D. Accessibility for the handicap - CORRECT ANSWER-D. ACCESSIBILITY FOR THE HANDICAP
What is not a recommended fire safety precaution in a correctional facility?
A. Fire resistant privacy curtains
B. Limiting personal items in cells?
,C. Banning Polyurethane mattresses
D. Manual override for electronic cell locks - CORRECT ANSWER-B. LIMITING PERSONAL ITEMS IN
CELLS?
What is the most likely infection if a tattoo artist uses a non-FDA approved product?
A. Dermatitis
B. Chemical poisoning
C. Staph
D. Strep - CORRECT ANSWER-C. STAPH
Which should you respond to first: - CORRECT ANSWER-CHLORINE GAS AT A POOL
Which should you respond to first:
A. Daycare with 3 absences and sick teachers
B. Sewer smell from backyard of a resident
C. Debris in a residential pool - CORRECT ANSWER-A. DAYCARE WITH 3 ABSENCES AND SICK
TEACHERS
The national emergency response structure is based on which? - CORRECT ANSWER-NIMS =
National incident management system
(Provide a nation-wide template to enable all entities to work together)
Staph was found to be what contaminated the potato salad, what caused it?
A. Fecal
B. Human
C. Animal - CORRECT ANSWER-B. HUMAN
What food activity would be safest to perform at a school event?
A. Bottling juice
B. Canning fruit in home economics
C. Baking a homemade custard pie
D. Cooking homegrown vegetables - CORRECT ANSWER-D. COOKING HOMEGROWN VEGETABLES
,What PH does staph grow best at? - CORRECT ANSWER-7.0 - 7.5
What type of patient is at risk for severe illness or death from a vibrio infection?
A. Heathy teens and Europeans
B. Women and others
C. COPD or GERD patients
D. Liver Disease or Alcoholics - CORRECT ANSWER-D. LIVER DISEASE OR ALCOHOLICS
According to the Food Code, put these in order:
Core, Priority, and Priority Foundation. - CORRECT ANSWER-1. Priority
2. Priority Foundation
3. Core
According to the Food code, which includes a critical point that can be checked?
A. Core
B. Priority
C. Priority Foundation
D. None of the above - CORRECT ANSWER-B. PRIORITY
What do cooling and reheating precautions control for?
A. Vibrio
B. Shigella
C. Salmonella
D. Clostridium Perfringens - CORRECT ANSWER-D. CLOSTRIDIUM PERFRINGENS
What happens when you freeze a toxin? - CORRECT ANSWER-NOTHING
What happens to bacteria when you freeze food? - CORRECT ANSWER-RENDERS THEM INACTIVE
, What is it called when you heat a food or liquid to kill pathogens? - CORRECT ANSWER-
PASTEURIZATION
Refrigerator food storage: - CORRECT ANSWER-1. Ready to Eat Foods
2. Whole Cuts of Meat (seafood)
3. Ground Meat
4. Poultry/Eggs
Who invented HACCP? - CORRECT ANSWER-NASA
HACCP (7 Steps) - CORRECT ANSWER-1. Hazard Analysis
2. Critical Control Points (CCP)
3. Critical Limits
4. Monitor
5. Corrective Actions
6. Verify
7. Record Keeping
Waterborne Disease Investigation Steps - CORRECT ANSWER-1. Detect
2. Define and Find
3. Generate Hypothesis
4. Test
5. Identify
6. Control
7. Decide
8. Prevent
What chlorine level is okay for disinfecting a food contact surface? - CORRECT ANSWER-50-99 ppm
(7 seconds contact time)
What is used to raise PH in a swimming pool? - CORRECT ANSWER-Soda Ash (sodium carbonate)
GUIDE – 2025 REGISTERED ENVIRONMENTAL HEALTH
SPECIALIST EXAM PREP WITH 600 VERIFIED QUESTIONS
AND CORRECT ANSWERS WITH MOST TESTED QUESTIONS
THIS RESOURCE PROVIDES COMPREHENSIVE COVERAGE OF KEY TOPICS FOR
THE REGISTERED ENVIRONMENTAL HEALTH SPECIALIST (REHS/RS) EXAM,
INCLUDING FOOD PROTECTION, WATER AND AIR QUALITY, WASTE
MANAGEMENT, VECTOR CONTROL, AND PUBLIC HEALTH LAWS. IT IS DESIGNED
FOR 2025 EXAM CANDIDATES SEEKING TO MASTER ENVIRONMENTAL HEALTH
PRINCIPLES AND ACHIEVE NATIONAL OR STATE CERTIFICATION SUCCESS.
What is a psychrometer used for? - CORRECT ANSWER-TO MEASURE RELATIVE HUMIDITY AND
DEW POINT.
All of these are important for silicosis infection except:
A. Size of dust particle inhaled
B. Amount of dust inhaled
C. Percentage of asbestos in dust
D. Presence of silica in dust - CORRECT ANSWER-C. PERCENTAGE OF ASBESTOS IN DUST
All school playground precautions are important except:
A. Pinching hazards
B. Durability of the ground material
C. Signs with age recommendations of play
D. Accessibility for the handicap - CORRECT ANSWER-D. ACCESSIBILITY FOR THE HANDICAP
What is not a recommended fire safety precaution in a correctional facility?
A. Fire resistant privacy curtains
B. Limiting personal items in cells?
,C. Banning Polyurethane mattresses
D. Manual override for electronic cell locks - CORRECT ANSWER-B. LIMITING PERSONAL ITEMS IN
CELLS?
What is the most likely infection if a tattoo artist uses a non-FDA approved product?
A. Dermatitis
B. Chemical poisoning
C. Staph
D. Strep - CORRECT ANSWER-C. STAPH
Which should you respond to first: - CORRECT ANSWER-CHLORINE GAS AT A POOL
Which should you respond to first:
A. Daycare with 3 absences and sick teachers
B. Sewer smell from backyard of a resident
C. Debris in a residential pool - CORRECT ANSWER-A. DAYCARE WITH 3 ABSENCES AND SICK
TEACHERS
The national emergency response structure is based on which? - CORRECT ANSWER-NIMS =
National incident management system
(Provide a nation-wide template to enable all entities to work together)
Staph was found to be what contaminated the potato salad, what caused it?
A. Fecal
B. Human
C. Animal - CORRECT ANSWER-B. HUMAN
What food activity would be safest to perform at a school event?
A. Bottling juice
B. Canning fruit in home economics
C. Baking a homemade custard pie
D. Cooking homegrown vegetables - CORRECT ANSWER-D. COOKING HOMEGROWN VEGETABLES
,What PH does staph grow best at? - CORRECT ANSWER-7.0 - 7.5
What type of patient is at risk for severe illness or death from a vibrio infection?
A. Heathy teens and Europeans
B. Women and others
C. COPD or GERD patients
D. Liver Disease or Alcoholics - CORRECT ANSWER-D. LIVER DISEASE OR ALCOHOLICS
According to the Food Code, put these in order:
Core, Priority, and Priority Foundation. - CORRECT ANSWER-1. Priority
2. Priority Foundation
3. Core
According to the Food code, which includes a critical point that can be checked?
A. Core
B. Priority
C. Priority Foundation
D. None of the above - CORRECT ANSWER-B. PRIORITY
What do cooling and reheating precautions control for?
A. Vibrio
B. Shigella
C. Salmonella
D. Clostridium Perfringens - CORRECT ANSWER-D. CLOSTRIDIUM PERFRINGENS
What happens when you freeze a toxin? - CORRECT ANSWER-NOTHING
What happens to bacteria when you freeze food? - CORRECT ANSWER-RENDERS THEM INACTIVE
, What is it called when you heat a food or liquid to kill pathogens? - CORRECT ANSWER-
PASTEURIZATION
Refrigerator food storage: - CORRECT ANSWER-1. Ready to Eat Foods
2. Whole Cuts of Meat (seafood)
3. Ground Meat
4. Poultry/Eggs
Who invented HACCP? - CORRECT ANSWER-NASA
HACCP (7 Steps) - CORRECT ANSWER-1. Hazard Analysis
2. Critical Control Points (CCP)
3. Critical Limits
4. Monitor
5. Corrective Actions
6. Verify
7. Record Keeping
Waterborne Disease Investigation Steps - CORRECT ANSWER-1. Detect
2. Define and Find
3. Generate Hypothesis
4. Test
5. Identify
6. Control
7. Decide
8. Prevent
What chlorine level is okay for disinfecting a food contact surface? - CORRECT ANSWER-50-99 ppm
(7 seconds contact time)
What is used to raise PH in a swimming pool? - CORRECT ANSWER-Soda Ash (sodium carbonate)
