NEHA REHS/RS Exam Flashcards

Q: How many questions are on the NEHA REHS/RS exam?

The exam delivers 225 multiple-choice questions in two parts: 113 in Part 1 and 112 in Part 2. NEHA scores 200 questions and uses 25 as unidentified pilot questions.

Q: How long is the REHS/RS exam?

Candidates receive three hours and 40 minutes total, or one hour and 50 minutes for each part, with a 10-minute break between parts.

Q: What score passes the REHS/RS exam?

The passing scaled score is 650 on a 0-900 scale. NEHA warns that a scaled score is not a percentage because raw results are transformed to keep reporting comparable across forms.

Q: What is the REHS/RS retake policy?

A candidate who fails must wait at least 90 days from the test date and submit a retake application. NEHA allows unlimited attempts, with the same 90-day wait between attempts.

Q: How were these 50 REHS/RS cards distributed?

The official scored blueprint weights are Surveillance 12%, Inspections 48%, Investigations 18%, Compliance Review 12%, and Environmental Health Information 10%. Those weights convert exactly to 6, 24, 9, 6, and 5 cards.

Question 1

How do hazard and risk differ?

Accepted Answer

A hazard is a source with potential to cause harm. Risk combines the likelihood of exposure or occurrence with the severity of the resulting harm.

Question 2

What should a surveillance plan define first?

Accepted Answer

A clear purpose and population or environmental condition of interest. Those choices determine what data, places, timing, and methods are appropriate.

Question 3

Why is a standard case or event definition important?

Accepted Answer

It applies consistent inclusion criteria, making observations comparable across investigators, locations, and time periods.

Question 4

What makes an environmental sample representative?

Accepted Answer

Its locations, timing, and collection method reflect the condition or exposure being assessed instead of systematically favoring one result.

Question 5

What is trend analysis in surveillance?

Accepted Answer

Comparing measurements over time to identify direction, seasonality, unusual changes, or emerging clusters rather than interpreting one value in isolation.

Question 6

When should surveillance findings trigger action?

Accepted Answer

When predefined criteria indicate an unacceptable condition or a meaningful departure from the expected baseline, considering data quality and public-health impact.

Question 7

What is the purpose of an opening conference during an inspection?

Accepted Answer

To identify the inspector, explain the scope and process, confirm responsible contacts, and gather current operational information.

Question 8

Why review governing requirements before an inspection?

Accepted Answer

The inspector must know which standards apply, what evidence demonstrates compliance, and which findings have the greatest health significance.

Question 9

What is risk-based inspection prioritization?

Accepted Answer

Scheduling frequency or urgency according to factors such as hazard severity, population vulnerability, operational complexity, and compliance history.

Question 10

Why must inspection instruments be calibrated?

Accepted Answer

Calibration checks measurement accuracy against a known reference so decisions are not based on systematic instrument error.

Question 11

What is a food-flow inspection approach?

Accepted Answer

Following food through receiving, storage, preparation, cooking, holding, cooling, reheating, and service to find contamination and time-temperature risks.

Question 12

What is cross-contamination?

Accepted Answer

The transfer of a biological, chemical, or physical hazard from a contaminated source to food, equipment, hands, or another clean surface.

Question 13

Where should a food temperature be measured?

Accepted Answer

In the portion most likely to be least heated or most slowly cooled, using a clean, suitable, calibrated probe placed away from the container surface.

Question 14

What is active managerial control in food safety?

Accepted Answer

A proactive system in which management identifies major foodborne-illness risks, sets controls, monitors performance, and corrects failures before harm occurs.

Question 15

What does a failing onsite wastewater drainfield indicate?

Accepted Answer

The soil treatment area is not accepting or treating effluent as designed, which may cause surfacing sewage, backups, or contamination of nearby water.

Question 16

Why is soil evaluation important for onsite wastewater?

Accepted Answer

Soil texture, structure, depth, restrictive layers, and seasonal saturation affect how effluent moves and receives treatment.

Question 17

What is a sanitary survey of a drinking-water system?

Accepted Answer

A structured onsite review of the source, treatment, storage, distribution, management, and operations for deficiencies that could compromise safety.

Question 18

Why is a drinking-water sample tap disinfected?

Accepted Answer

To reduce contamination from the faucet surface so the sample better represents water in the system rather than organisms on the fixture.

Question 19

What does a disinfectant residual indicate?

Accepted Answer

The amount of disinfectant remaining after demand has been met, providing evidence of ongoing treatment capacity within the system.

Question 20

What is the main function of pool recirculation?

Accepted Answer

Moving water through treatment and filtration, then distributing treated water throughout the venue to control contaminants and maintain uniform conditions.

Question 21

Why inspect a recreational-water main drain and barriers?

Accepted Answer

Drain covers help prevent entrapment hazards, while barriers and controlled access reduce unsupervised entry and drowning risk.

Question 22

What is the solid-waste hierarchy?

Accepted Answer

A preference for preventing waste first, then reuse, recycling or recovery, treatment, and finally disposal when higher options are not feasible.

Question 23

Why must hazardous wastes be properly identified?

Accepted Answer

Their properties determine compatible storage, labeling, transport, treatment, emergency precautions, and lawful disposal.

Question 24

What is the purpose of infectious-waste containment?

Accepted Answer

To prevent leaks, needlesticks, exposure, and environmental release from generation through treatment and final disposal.

Question 25

Why are single-use needles critical in body art?

Accepted Answer

A sterile needle used for only one client prevents direct transfer of bloodborne pathogens between clients.

Question 26

What is the main sanitation concern at a temporary mass gathering?

Accepted Answer

Whether safe water, food protection, toilets, handwashing, waste handling, and emergency capacity remain adequate for the expected crowd and duration.

Question 27

What is a healthy-homes inspection designed to identify?

Accepted Answer

Housing-related hazards such as moisture, pests, lead, unsafe structures, combustion risks, poor ventilation, and injury hazards.

Question 28

Why are vulnerable populations central to institution inspections?

Accepted Answer

Residents may have limited mobility, immunity, communication, or ability to avoid hazards, increasing the consequence of sanitation and safety failures.

Question 29

What is the source-pathway-receptor model?

Accepted Answer

It traces a hazard from its origin, through the route it travels, to the person or population exposed, helping identify effective control points.

Question 30

What should an inspection closing conference accomplish?

Accepted Answer

Explain findings and their basis, confirm immediate corrections, identify remaining deadlines, and answer process questions without bargaining away requirements.

Question 31

What is an epidemiologic case definition?

Accepted Answer

A consistent set of clinical, laboratory, person, place, and time criteria used to classify cases during an investigation.

Question 32

What is a line list?

Accepted Answer

A table with one case per row and key variables in columns, used to organize and compare investigation data quickly.

Question 33

How do incidence and prevalence differ?

Accepted Answer

Incidence counts new cases arising over a period; prevalence measures all existing cases in a population at a point or during a period.

Question 34

What does an attack rate compare?

Accepted Answer

The proportion of an at-risk group that becomes ill during an outbreak, often compared across exposure groups to identify a likely source.

Question 35

Why build an epidemic curve?

Accepted Answer

Plotting cases by onset time helps show the outbreak's magnitude, timing, likely exposure pattern, and possible outliers.

Question 36

What is the purpose of an environmental exposure history?

Accepted Answer

To identify plausible contacts with hazards by asking about locations, activities, products, work, housing, food, water, and timing.

Question 37

Why is chain of custody documented?

Accepted Answer

It records who controlled a sample and when, supporting its identity, integrity, and defensibility from collection through analysis.

Question 38

How is risk abatement verified?

Accepted Answer

By confirming required controls were completed and using appropriate follow-up observation, records, or testing to show the hazard is acceptably controlled.

Question 39

What is integrated pest management?

Accepted Answer

A prevention-focused approach that monitors pests, removes food and shelter, excludes entry, and uses targeted controls with the least practical risk.

Question 40

Why conduct plan review before construction?

Accepted Answer

Design problems can be corrected on paper before they become costly physical hazards or barriers to compliant operation.

Question 41

What is a critical control point in HACCP?

Accepted Answer

A step where control can be applied and is essential to prevent, eliminate, or reduce a significant food-safety hazard to an acceptable level.

Question 42

What is a HACCP critical limit?

Accepted Answer

A measurable boundary that separates acceptable from unacceptable operation at a critical control point.

Question 43

What must a variance request demonstrate?

Accepted Answer

That an alternative to the prescriptive requirement will provide equivalent public-health protection through supported controls and monitoring.

Question 44

Why verify permitting status?

Accepted Answer

A valid permit shows the operation has entered the applicable oversight system, but it does not by itself prove current compliance.

Question 45

What makes a compliance record defensible?

Accepted Answer

Objective observations, accurate measurements, cited requirements, dates, responsible parties, and clear documentation of corrections and follow-up.

Question 46

How should an inspector communicate a finding?

Accepted Answer

State the observed condition, explain the health significance, connect it to the applicable requirement, and identify the needed correction.

Question 47

What makes corrective-action guidance useful?

Accepted Answer

It is specific about the outcome required and timing while allowing the responsible party to choose a lawful, effective method when alternatives exist.

Question 48

What is technical assistance?

Accepted Answer

Explaining requirements and control options so a person can prevent or correct hazards without compromising the regulator's impartial enforcement role.

Question 49

What is effective risk communication?

Accepted Answer

Timely, accurate, understandable information that explains what is known, what is uncertain, who may be affected, and what protective actions to take.

Question 50

Why collaborate with community stakeholders?

Accepted Answer

They contribute local knowledge, trusted communication channels, resources, and implementation support that can make health interventions more practical and equitable.

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