What Is EHS? Environmental, Health and Safety Explained

Environmental work deals with what a site releases or produces: air emissions, wastewater, stormwater, hazardous and solid waste, spills, and the permits and records that go with them. Health, often called occupational health or industrial hygiene, deals with exposures that make people sick over time, such as chemicals, noise, heat, dust and ergonomic strain. Safety deals with the hazards that injure people suddenly, such as machinery, falls, vehicles, electrical work and confined spaces.

The three disciplines are grouped because they share the same tools. Each one starts by identifying hazards, judges the risk, puts controls in place, trains people, inspects, investigates when something goes wrong and keeps records that a regulator or auditor can review. In a small company one person may cover all three. In a large company each discipline may have its own team, with an EHS leader over all of them.

In the United States, the safety and health side is shaped mainly by the Occupational Safety and Health Administration (OSHA). President Nixon signed the Occupational Safety and Health Act on December 29, 1970, and OSHA opened on April 28, 1971. OSHA describes its mission as assuring that workers have safe and healthful working conditions free from unlawful retaliation. It sets and enforces standards, enforces whistleblower protections, provides training, outreach and assistance, and oversees state OSHA programs, which must be at least as effective as the federal program. According to OSHA, the OSH Act covers most private sector employers and their workers, plus some public sector employers.

The same 1970 law created the National Institute for Occupational Safety and Health (NIOSH), which is part of the CDC. NIOSH is a research institute: it studies work-related injury and illness and makes recommendations for preventing them. EHS professionals rely on NIOSH research and guidance, while OSHA is the agency that inspects and enforces.

The environmental side is shaped mainly by the U.S. Environmental Protection Agency (EPA), whose stated mission is to protect human health and the environment. EPA writes regulations to carry out federal environmental laws and enforces them, often through state and Tribal partners. In practice, many environmental permits and inspections an EHS team deals with come from a state agency acting under those programs.

Beyond the law, many organizations run voluntary management systems built on international standards. ISO 45001 sets requirements for an occupational health and safety management system, and ISO 14001 does the same for an environmental management system. Both apply to organizations of any size or sector. ISO states that certification to ISO 14001 is optional and is done by third-party certification bodies. As of October 2026, ISO 14001 is in its 2026 edition, and a revision of ISO 45001 is in draft to replace the 2018 edition, so check the current edition before quoting either one.

The Bureau of Labor Statistics (BLS) describes occupational health and safety specialists as people who inspect workplaces for compliance with safety, health and environmental regulations, design programs to control chemical, physical and other risks, educate employers and workers, and investigate incidents to find causes and prevent repeats. Technicians support that work by collecting data, carrying out planned improvements and checking that workers use required protective equipment. Both may develop and deliver training.

On the environmental side, BLS describes environmental scientists and specialists who collect and analyze samples, identify sources of pollution or hazards, develop plans to prevent or fix environmental problems, and advise businesses and government on environmental risks. BLS notes that consultants in this field help businesses reduce waste, prevent pollution and follow regulations.

In a typical site role, that turns into a week like this:

Titles vary a lot between employers, so read the duties, not just the title. A rough ladder you will see in postings runs from EHS technician or coordinator, to EHS specialist, to EHS manager, to EHS director or vice president. Discipline-specific titles sit alongside it: safety coordinator, safety manager, industrial hygienist, environmental specialist, environmental compliance manager and health and safety engineer.

Federal data does not use these exact titles. BLS groups most safety and health program roles under occupational health and safety specialists and technicians, and most environmental compliance and science roles under environmental scientists and specialists. When you research pay or outlook, start with those occupations and remember that a manager title with direct reports and a budget usually carries more scope than the occupation as a whole.

Two clues in a posting tell you more than the title. The first is scope: one site or many, how many workers, and whether the role owns programs or advises site leaders. The second is mix: some EHS jobs are mostly safety with a little environmental paperwork, and others are the reverse. Ask which one it is before you apply.

EHS work happens wherever people do physical work or a site has a regulated release. BLS employment data for 2025 show that the largest employers of occupational health and safety specialists were government (18 percent), manufacturing (17 percent), construction (17 percent), transportation and warehousing (8 percent) and management, scientific and technical consulting services (6 percent). For environmental scientists and specialists, the largest employers were state government (28 percent), consulting services (19 percent), local government (13 percent), engineering services (11 percent) and the federal government (6 percent).

Inside a company, a site EHS person often reports to the plant or operations manager, with a dotted line to a corporate EHS leader. At the corporate level, EHS may report to operations, legal, human resources or a sustainability function. The reporting line matters: it shapes how much authority you have to stop work, how your budget is set and who you need to persuade.

According to BLS, occupational health and safety specialists typically need a bachelor's degree in occupational health and safety or a related field, such as biology or healthcare, and some positions require a master's degree. Technicians typically need at least a high school diploma and learn on the job, and some earn an associate's degree or certificate. Environmental scientists and specialists typically need a bachelor's degree in environmental science or a related field.

BLS also notes that employers may prefer or require professional certification, which generally means graduating from an accredited program, completing work experience, passing an exam and keeping up continuing education. Certifications are issued by independent bodies with their own rules, so confirm current requirements with the issuer before you plan around one.

Many people also arrive sideways: a production supervisor, a construction foreman, a veteran who handled safety duties in the service, or a lab technician who took on safety duties and found they liked it. Field credibility counts in this work, and hiring managers often weigh how you have handled real hazards and real people as heavily as your degree.