NEHA REHS/RS Exam Questions & Answers|
Pass Guaranteed| 2027 Updated
NEHA REHS/RS Exam Practice Test
Verified Questions & Answers (2026/2027 Update)
SECTION 1: ENVIRONMENTAL HEALTH SURVEILLANCE
1. 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. To systematically collect, analyze, and interpret health data
for planning, implementation, and evaluation of public health practice.
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 .
2. 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. Establishing a clear case definition for the disease. 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 .
3. 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. Implement targeted interventions such as soil testing and
lead paint abatement in the affected area. 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 .
4. 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. REHS staff calling hospitals and laboratories weekly to
identify potential cases. 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 .
5. 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. The number of new cases occurring in a specific population
during a given time period. 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 .
6. 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 determine the exact number of insects in a specific area
D. To document all insect species present in a community
Correct Answer: A. To predict potential disease outbreaks and target control
measures before human cases occur. Rationale: Vector surveillance allows public
health officials to predict potential disease outbreaks and implement control
measures before human cases occur .
Pass Guaranteed| 2027 Updated
NEHA REHS/RS Exam Practice Test
Verified Questions & Answers (2026/2027 Update)
SECTION 1: ENVIRONMENTAL HEALTH SURVEILLANCE
1. 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. To systematically collect, analyze, and interpret health data
for planning, implementation, and evaluation of public health practice.
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 .
2. 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. Establishing a clear case definition for the disease. 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 .
3. 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. Implement targeted interventions such as soil testing and
lead paint abatement in the affected area. 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 .
4. 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. REHS staff calling hospitals and laboratories weekly to
identify potential cases. 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 .
5. 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. The number of new cases occurring in a specific population
during a given time period. 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 .
6. 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 determine the exact number of insects in a specific area
D. To document all insect species present in a community
Correct Answer: A. To predict potential disease outbreaks and target control
measures before human cases occur. Rationale: Vector surveillance allows public
health officials to predict potential disease outbreaks and implement control
measures before human cases occur .
