REHS/RS Certification Exam Review – National
Environmental Health Association (NEHA) |
2026/2027 Work Exams with Verified Questions,
and Answers.
SET 1: CORE KNOWLEDGE ASSESSMENT (Questions 1-75)
DUTY AREA A: ENVIRONMENTAL HEALTH SURVEILLANCE (Questions 1-9)
Q1. Which of the following best describes the primary purpose of environmental health
surveillance?
A. To enforce federal regulations through criminal prosecution
B. To systematically collect, analyze, and interpret health data for planning, implementation,
and evaluation of public health practice
C. To immediately close facilities that are out of compliance with local ordinances
D. To provide medical treatment for individuals exposed to environmental hazards
Correct Answer: B
Rationale: Environmental health surveillance is the ongoing systematic collection, analysis,
and interpretation of health data essential to the planning, implementation, and evaluation of
public health practice, closely integrated with the timely dissemination of these data to those
who need to know.
Q2. An REHS is setting up a surveillance system for tracking Lyme disease cases in a new
jurisdiction. Which of the following is the most critical initial step in planning this surveillance
activity?
A. Purchasing new computers for data entry
B. Establishing a clear case definition for the disease
,C. Training staff on tick identification
D. Distributing educational pamphlets to the public
Correct Answer: B
Rationale: Establishing a clear, standardized case definition is the critical first step to ensure
data consistency and validity. Without a standard definition, surveillance data cannot be
accurately compared across time or regions, rendering the system ineffective for tracking
trends.
Q3. During routine surveillance of community lead levels, an REHS notices a cluster of
elevated blood lead levels in children living in a specific neighborhood. After analyzing the
data, what is the most appropriate immediate action?
A. Publish a press release warning all citizens to evacuate the town
B. Implement targeted interventions such as soil testing and lead paint abatement in the
affected area
C. Wait until next year's data to confirm if the trend continues
D. Lower the surveillance threshold to reduce the number of reported cases
Correct Answer: B
Rationale: The final link in the surveillance cycle is the application of the data to public health
practice. Identifying a cluster requires prompt implementation of control measures and
interventions to address the identified health hazard.
Q4. Which of the following data sources is considered "active surveillance" for foodborne
illnesses?
A. Reviewing laboratory reports submitted by hospitals
B. Waiting for physicians to call the health department with suspected cases
C. REHS staff calling hospitals and laboratories weekly to identify potential cases
D. Analyzing death certificate data for causes of mortality
,Correct Answer: C
Rationale: Active surveillance involves the health agency initiating the data collection by
regularly contacting providers (hospitals, labs) to identify cases. Passive surveillance relies on
providers reporting to the agency on their own initiative.
Q5. An REHS is analyzing surveillance data regarding illicit drug activity at a local park, a
situation that often involves police intervention. Why is it important for the REHS to collect
this data?
A. To enforce federal drug laws
B. To assess the risk of bloodborne pathogens from discarded needles and guide park
maintenance/sharps disposal protocols
C. To reduce police workload
D. To increase property values in the area
Correct Answer: B
Rationale: Environmental health surveillance focuses on health hazards. Illicit drug activity in
public spaces creates environmental health risks such as needle stick injuries and exposure to
bloodborne pathogens (HIV, Hepatitis B/C). Data collection guides safety protocols for park
staff and the public.
Q6. When analyzing surveillance data to determine the "incidence" of a disease, the REHS is
calculating:
A. The total number of cases existing at a specific point in time
B. The number of new cases occurring in a specific population during a given time period
C. The percentage of the population that dies from the disease
D. The likelihood of recovery from the disease
Correct Answer: B
, Rationale: Incidence refers to the number of new cases of a disease that develop in a
population at risk during a specific time interval. Prevalence refers to the total number of
existing cases at a point in time.
Q7. Which of the following is a primary objective of collecting surveillance data on vector
populations?
A. To predict potential disease outbreaks and target control measures before human cases
occur
B. To calculate the total biomass of insects in the ecosystem
C. To justify the hiring of additional administrative staff
D. To satisfy federal grant requirements without practical application
Correct Answer: A
Rationale: Vector surveillance provides early warning indicators of disease risk (e.g., tracking
mosquito pools for West Nile Virus). This allows for proactive control measures to prevent or
minimize human transmission.
Q8. An REHS is planning a surveillance program for recreational water quality. To ensure the
data collected is useful for decision-making, the REHS should:
A. Collect samples from only the cleanest areas to ensure good results
B. Establish sampling protocols that include frequency, location, and methodology aligned
with regulatory standards
C. Sample only when a complaint is received
D. Use the cheapest laboratory available regardless of certification status
Correct Answer: B
Rationale: A surveillance plan must include scientifically valid protocols for sampling
frequency, representative locations, and standardized methodology to ensure data quality
(validity and reliability) and comparability to regulatory standards.
Environmental Health Association (NEHA) |
2026/2027 Work Exams with Verified Questions,
and Answers.
SET 1: CORE KNOWLEDGE ASSESSMENT (Questions 1-75)
DUTY AREA A: ENVIRONMENTAL HEALTH SURVEILLANCE (Questions 1-9)
Q1. Which of the following best describes the primary purpose of environmental health
surveillance?
A. To enforce federal regulations through criminal prosecution
B. To systematically collect, analyze, and interpret health data for planning, implementation,
and evaluation of public health practice
C. To immediately close facilities that are out of compliance with local ordinances
D. To provide medical treatment for individuals exposed to environmental hazards
Correct Answer: B
Rationale: Environmental health surveillance is the ongoing systematic collection, analysis,
and interpretation of health data essential to the planning, implementation, and evaluation of
public health practice, closely integrated with the timely dissemination of these data to those
who need to know.
Q2. An REHS is setting up a surveillance system for tracking Lyme disease cases in a new
jurisdiction. Which of the following is the most critical initial step in planning this surveillance
activity?
A. Purchasing new computers for data entry
B. Establishing a clear case definition for the disease
,C. Training staff on tick identification
D. Distributing educational pamphlets to the public
Correct Answer: B
Rationale: Establishing a clear, standardized case definition is the critical first step to ensure
data consistency and validity. Without a standard definition, surveillance data cannot be
accurately compared across time or regions, rendering the system ineffective for tracking
trends.
Q3. During routine surveillance of community lead levels, an REHS notices a cluster of
elevated blood lead levels in children living in a specific neighborhood. After analyzing the
data, what is the most appropriate immediate action?
A. Publish a press release warning all citizens to evacuate the town
B. Implement targeted interventions such as soil testing and lead paint abatement in the
affected area
C. Wait until next year's data to confirm if the trend continues
D. Lower the surveillance threshold to reduce the number of reported cases
Correct Answer: B
Rationale: The final link in the surveillance cycle is the application of the data to public health
practice. Identifying a cluster requires prompt implementation of control measures and
interventions to address the identified health hazard.
Q4. Which of the following data sources is considered "active surveillance" for foodborne
illnesses?
A. Reviewing laboratory reports submitted by hospitals
B. Waiting for physicians to call the health department with suspected cases
C. REHS staff calling hospitals and laboratories weekly to identify potential cases
D. Analyzing death certificate data for causes of mortality
,Correct Answer: C
Rationale: Active surveillance involves the health agency initiating the data collection by
regularly contacting providers (hospitals, labs) to identify cases. Passive surveillance relies on
providers reporting to the agency on their own initiative.
Q5. An REHS is analyzing surveillance data regarding illicit drug activity at a local park, a
situation that often involves police intervention. Why is it important for the REHS to collect
this data?
A. To enforce federal drug laws
B. To assess the risk of bloodborne pathogens from discarded needles and guide park
maintenance/sharps disposal protocols
C. To reduce police workload
D. To increase property values in the area
Correct Answer: B
Rationale: Environmental health surveillance focuses on health hazards. Illicit drug activity in
public spaces creates environmental health risks such as needle stick injuries and exposure to
bloodborne pathogens (HIV, Hepatitis B/C). Data collection guides safety protocols for park
staff and the public.
Q6. When analyzing surveillance data to determine the "incidence" of a disease, the REHS is
calculating:
A. The total number of cases existing at a specific point in time
B. The number of new cases occurring in a specific population during a given time period
C. The percentage of the population that dies from the disease
D. The likelihood of recovery from the disease
Correct Answer: B
, Rationale: Incidence refers to the number of new cases of a disease that develop in a
population at risk during a specific time interval. Prevalence refers to the total number of
existing cases at a point in time.
Q7. Which of the following is a primary objective of collecting surveillance data on vector
populations?
A. To predict potential disease outbreaks and target control measures before human cases
occur
B. To calculate the total biomass of insects in the ecosystem
C. To justify the hiring of additional administrative staff
D. To satisfy federal grant requirements without practical application
Correct Answer: A
Rationale: Vector surveillance provides early warning indicators of disease risk (e.g., tracking
mosquito pools for West Nile Virus). This allows for proactive control measures to prevent or
minimize human transmission.
Q8. An REHS is planning a surveillance program for recreational water quality. To ensure the
data collected is useful for decision-making, the REHS should:
A. Collect samples from only the cleanest areas to ensure good results
B. Establish sampling protocols that include frequency, location, and methodology aligned
with regulatory standards
C. Sample only when a complaint is received
D. Use the cheapest laboratory available regardless of certification status
Correct Answer: B
Rationale: A surveillance plan must include scientifically valid protocols for sampling
frequency, representative locations, and standardized methodology to ensure data quality
(validity and reliability) and comparability to regulatory standards.
