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Question 1
Which regulatory body is primarily responsible for establishing noise control measures in the workplace?
Correct Answer:
Occupational Safety and Health Administration (OSHA)
Explanation:
The Occupational Safety and Health Administration (OSHA) is the primary regulatory body responsible for establishing noise control measures in the workplace. OSHA's mission is to ensure safe and healthy working conditions by setting and enforcing standards, providing training, outreach, education, and assistance. Under the Occupational Safety and Health Act, OSHA is tasked with addressing workplace hazards, including exposure to excessive noise. OSHA has specific regulations that define permissible noise exposure levels, such as the requirement for employers to implement a hearing conservation program when employees are exposed to noise levels at or above 85 decibels averaged over an 8-hour workday. This regulatory framework is essential for preventing hearing loss and ensuring the well-being of workers exposed to hazardous noise levels in various industries. The other regulatory bodies mentioned have different primary focuses: the Environmental Protection Agency (EPA) generally addresses environmental issues including air and water quality but does not focus specifically on workplace noise; the Federal Aviation Administration (FAA) deals primarily with aviation safety and regulation, including noise related to airport operations; and the Department of Health and Human Services (HHS) centers on public health and social services, without direct responsibility for workplace noise control.
Question 2
What purpose do local sewage and waste ordinances serve?
Correct Answer:
To establish guidelines for public health
Explanation:
Local sewage and waste ordinances serve primarily to establish guidelines for public health. These ordinances are critical in ensuring that waste is managed effectively to prevent health hazards associated with improper disposal and treatment of sewage. They outline the responsibilities of property owners and businesses in disposing of waste and managing sewage systems to protect the community from diseases and environmental degradation. By setting specific standards for waste disposal methods and sewage treatment, these ordinances aim to minimize risks of contamination in drinking water, soil, and air, thus safeguarding public health. They often include provisions for regular inspections, maintenance of sewer systems, and requirements for proper waste disposal techniques, all of which are vital for maintaining a safe and healthy environment for residents. While encouraging waste management and considering property values might be beneficial indirect effects of such regulations, the foremost concern of these ordinances remains the protection of public health. Promoting industrial development, while important for economic growth, is not typically a primary focus of sewage and waste ordinances. Thus, the emphasis on public health is what solidifies the role of these ordinances in community health and safety.
Question 3
The test that indicates the amount of extraneous material in milk but does not show dissolved material is called what?
Correct Answer:
Sediment
Explanation:
The test that indicates the amount of extraneous material in milk, while not measuring dissolved material, is known as the sediment test. This method is primarily used to detect particulate matter, such as dirt, feed particles, or other impurities that can settle at the bottom of a container. Sediment in milk often results from improper handling or contamination during the production process, and assessing its amount helps determine the quality and safety of the milk. Unlike microscopic count, which evaluates the presence of microorganisms (bacteria, yeast, or molds) and can indicate the microbial quality of milk, the sediment test focuses solely on physical impurities. Thermoduric testing measures the ability of certain bacteria to survive heat treatment, which doesn't pertain to the presence of physical contaminants. The appearance of the milk might provide a visual indication of extraneous materials but doesn’t quantitatively assess the sediment found in the sample. Hence, the sediment test is the most relevant for identifying non-dissolved impurities in milk.
Question 4
What is the primary concern regarding exposure to low-level radiation?
Correct Answer:
Delayed health effects
Explanation:
The primary concern regarding exposure to low-level radiation is indeed related to delayed health effects. Low-level radiation is not associated with the immediate onset of illness, which means it does not typically cause acute symptoms or immediate sickness. Instead, the risks associated with low-level exposure often manifest over a longer period, potentially leading to serious health outcomes such as cancer or other chronic conditions. This delayed nature of health effects is critical to understand because it complicates the process of linking exposure to outcomes; many years may pass between exposure and the development of health issues, making it challenging to establish direct causality. The long-term biological effects of low-dose radiation can be insidious, as they may not be apparent until years post-exposure, emphasizing the importance of monitoring and regulations to mitigate risk. While environmental impact is relevant in discussions about radiation, the more pressing concern from a public health perspective is the potential for these delayed health effects on individuals and populations. Therefore, the focus on delayed health effects reflects a well-understood principle in environmental health related to radiation exposure.
Question 5
What skin disease is caused by the burrowing of a mite into the skin?
Correct Answer:
Scabies
Explanation:
Scabies is a skin disease caused by the burrowing of the Sarcoptes scabiei mite into the skin. This microscopic parasite creates tunnels beneath the surface of the skin where it lays its eggs, leading to intense itching and a rash. The condition is highly contagious and often spreads through close physical contact, making it a significant public health concern. The presence of the mite triggers an immune response, which results in the characteristic symptoms of scabies, such as red, itchy bumps and lesions. Treatment typically involves topical medications that kill the mites and often requires washing clothes and bedding to prevent reinfestation. In contrast, the other conditions mentioned are caused by different pathogens or factors. Tularemia is a bacterial infection caused by Francisella tularensis, primarily affecting the lungs or skin but not caused by mites. Psittacosis is an infectious disease caused by Chlamydophila psittaci, typically associated with birds, and is unrelated to mite infestations. Pediculosis refers to an infestation of lice, which are insects, rather than mites, and affects hair on the scalp or other areas but does not involve burrowing into the skin.
Question 1
Exam overview

About this Exam

The NEHA Registered Environmental Health Specialist/Registered Sanitarian (REHS/RS) certification is the gold standard for professionals dedicated to protecting public health by safeguarding the environment.

This premier credential is designed for individuals working in a wide range of environmental health and sanitation fields, including government regulatory agencies, private industry, academia, and the military. It validates your competency in understanding, identifying, and controlling environmental factors that can adversely affect human health.

Earning this designation signals to employers and the public that you possess the comprehensive knowledge and practical skills required to manage the complex environmental challenges facing communities today, from ensuring food safety to managing hazardous materials and responding to public health emergencies.

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Additional Information

What the Course Entails and Exam Details

This comprehensive study guide and the associated practice exam prepare you for the entire body of knowledge tested by the NEHA REHS/RS credential.

The core syllabus and skills you must master span several critical domains of environmental health science and practice. Key areas covered include:

  • Food Protection: Ensuring the safety of the food supply through proper handling, processing, inspection, and regulatory compliance.
  • Potable Water: Protecting drinking water quality, understanding supply systems, and conducting water quality sampling and analysis.
  • Wastewater Management: Managing onsite wastewater systems, municipal treatment processes, and public health implications of sewage disposal.
  • Hazardous and Solid Waste: Identifying, managing, and disposing of hazardous materials and solid waste safely and legally.
  • Vector Control: Understanding the ecology of disease vectors (such as rodents and insects) and implementing effective control strategies.
  • Air Quality and Noise Control: Assessing indoor and outdoor air quality, and understanding noise pollution regulations and mitigation.
  • Radiation Protection: Basics of ionizing and non-ionizing radiation, and principles of protection and monitoring.
  • Institutional Health and the Built Environment: Ensuring safety and sanitation in housing, schools, healthcare facilities, and recreational areas like swimming pools.
  • Disaster and Emergency Response: Preparing for, responding to, and recovering from environmental health impacts of disasters.
  • Epidemiology and Toxicology: Principles of disease transmission and the health effects of chemical exposure.
  • Statutes, Regulations, and Enforcement: Understanding the legal framework governing environmental health and the procedures for enforcement.
  • Administration and Communication: Managing environmental health programs and effectively communicating risks and requirements to the public and stakeholders.

The study materials, particularly the practice exam, are structured to mirror these domains, providing a realistic measure of your readiness for the actual certification test.

 

What to Expect in the Final Exam

The formal NEHA REHS/RS examination is a robust assessment designed to rigorously test your broad range of knowledge and problem-solving abilities.

The final exam format is entirely computer-based and consists of up to 250 multiple-choice questions. It is important to note that only approximately 225 of these questions are scored; the remaining questions are unscored pilot questions used for future exam development.

Candidates are allowed a total of 4 hours to complete the entire exam. The examination is generally administered in two 125-question sessions with a short break provided between the sessions.

To pass the NEHA REHS/RS exam, you must achieve a scaled score of 650 or higher. The raw score (number of questions correct) is mathematically transformed into a scaled score ranging from 0 to 900. Scaled scoring ensures that scores are comparable across different versions of the exam that might vary slightly in difficulty. Your score is determined solely by the number of correct answers, so there is no penalty for guessing. If you are taking the exam at a Pearson VUE testing center, you will typically receive your unofficial score report immediately upon completion.

 

 

 How to Study and Exam Centers

Preparation is paramount for success on the demanding REHS/RS exam. A strategic approach that combines structured review with deliberate practice is recommended.

Start by creating a structured study schedule that allocates ample time to each of the content domains, focusing additional time on your weaker areas. NEHA strongly recommends utilizing their official resources, including the REHS/RS Study Guide, the REHS/RS Online Study Course, and, critically, their official online practice exams. Practice exams are invaluable for familiarizing yourself with the multiple-choice format, assessing your knowledge gaps, and practicing under time constraints. Focus not just on identifying the correct answer but also on understanding why that answer is correct and why the distractors are incorrect.

The official REHS/RS exam is administered via computer at authorized testing centers worldwide, primarily through NEHA’s testing partner, Pearson VUE. To take the exam, you must first apply and be approved for eligibility by NEHA. Once your eligibility is confirmed and you have paid the necessary fees, you will receive an Authorization-to-Test (ATT) email, which allows you to schedule your exam appointment directly through the Pearson VUE online portal or by phone. Choosing a convenient Pearson VUE center helps you manage test-day logistics and reduce stress. If you fail the exam, NEHA requires you to wait at least 90 days before your next attempt.

 

 

 Job Opportunities from the Course

Achieving the NEHA REHS/RS credential unlocks diverse and meaningful career opportunities across the entire spectrum of public and environmental health.

This certification is often a prerequisite for employment or advancement within state and local health departments, federal agencies, and many private sector compliance roles. Career paths unlocked by this credential include:

  • Environmental Health Specialist (Levels I, II, III, Senior)
  • Registered Sanitarian / Public Health Sanitarian
  • Food Safety Inspector / Consumer Health Specialist
  • Public Health Inspector
  • Vector Control Specialist / Manager
  • Wastewater Management Specialist
  • Environmental Health Manager / Director
  • Occupational Health and Safety Officer
  • Disaster/Emergency Response Coordinator (Environmental Health Focus)
  • Environmental Health Consultant / Private Inspector
  • Academic Instructor / Researcher in Environmental Health
Quiz information

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