Introduction to OSHA
This chapter introduces the Occupational Safety and Health Administration (OSHA), the federal agency created to help ensure safe and healthful working conditions. You will learn why OSHA exists, what rights workers have, what responsibilities employers carry, how inspections and citations work, and how injuries and illnesses are recorded. Understanding this foundation helps every worker recognize their role in a strong safety culture.
Why OSHA Exists
Before 1970, no single federal law protected the American worker, and an estimated 14,000 workers died on the job each year while millions more were injured or made ill. Congress responded with the Occupational Safety and Health Act of 1970 (the OSH Act, Public Law 91-596), which took effect in 1971 and created the Occupational Safety and Health Administration within the U.S. Department of Labor. The Act's stated purpose is to assure so far as possible every working man and woman in the Nation safe and healthful working conditions. To reach that goal, OSHA was given three core powers: to set enforceable standards, to inspect workplaces, and to require employers to eliminate recognized hazards. Construction work is governed primarily by the standards in 29 CFR Part 1926, while general industry follows 29 CFR Part 1910 and injury recordkeeping follows 29 CFR Part 1904. The same law created the National Institute for Occupational Safety and Health (NIOSH), a research agency housed in the CDC rather than the Department of Labor. NIOSH studies workplace hazards, publishes Recommended Exposure Limits, and evaluates hazards on request, but it does not write or enforce regulations, which is OSHA's authority alone. The Act also lets states run their own OSHA-approved programs (State Plans) that must be at least as effective as federal OSHA; about half the states operate one, and many cover public employees whom federal OSHA does not. This structure matters on the job because it explains where a rule comes from and who enforces it. When no standard exists for a specific hazard, OSHA still holds employers accountable through the General Duty Clause, Section 5(a)(1) of the Act, which requires a workplace free from recognized hazards likely to cause death or serious physical harm. A federal law, an enforcement agency, a research institute, and a body of written standards form the foundation every OSHA 30 topic builds upon.
Worker Rights
The OSH Act and OSHA's regulations give workers a specific set of rights so they can take an active part in their own protection. Under Section 8 of the Act and 29 CFR Part 1903, workers may file a complaint and request an OSHA inspection when they believe a serious hazard exists or a standard is being violated, and they may ask that their name be withheld from the employer, keeping the complaint confidential. Workers have the right to be trained about the hazards they face in a language and vocabulary they understand, a duty stated in 29 CFR 1926.21(b)(2). They have the right to information such as Safety Data Sheets under the Hazard Communication Standard and to review the OSHA 300 Log of work-related injuries and illnesses and certain medical and exposure records under 29 CFR 1904.35 and 29 CFR 1910.1020. If OSHA inspects, an authorized employee representative may take part in the walkaround, and any worker may speak privately with the compliance officer. Workers may also see the results of workplace hazard tests and any citations issued to their employer, which must be posted at or near the location of the violation. Critically, Section 11(c) of the Act protects workers from retaliation: an employer may not fire, demote, transfer, cut hours, or otherwise punish an employee for reporting a hazard, filing a complaint, taking part in an inspection, or refusing work under a reasonable, good-faith belief of imminent danger. A worker who believes they were punished for exercising these rights generally has 30 days to file an 11(c) complaint with OSHA. These rights are not automatic protection against every risk; they are tools that only work when workers know they exist and use them. That is exactly why OSHA requires the Job Safety and Health: It's the Law poster to be displayed where employees can see it, informing them of their rights and how to reach OSHA.
Employer Responsibilities
While workers have rights, employers hold the primary legal duty to provide a safe workplace, and that duty has two parts. First, employers must comply with every specific OSHA standard that applies to their work, which for construction means the requirements throughout 29 CFR Part 1926. Second, where no specific standard addresses a hazard, the General Duty Clause, Section 5(a)(1) of the OSH Act, requires the employer to furnish a place of employment free from recognized hazards that are causing or are likely to cause death or serious physical harm; OSHA cites it for hazards such as workplace heat and ergonomic risks that lack their own construction standard. Beyond these broad duties, employers have concrete obligations. They must initiate and maintain accident-prevention programs and provide a competent person to make frequent and regular inspections of the job site under 29 CFR 1926.20(b). They must instruct each employee to recognize and avoid unsafe conditions under 29 CFR 1926.21(b)(2). They must provide most required personal protective equipment at no cost and keep it in reliable condition under 29 CFR 1926.95. Employers must display the OSHA It's the Law poster, keep injury and illness records where required, report severe incidents, and never retaliate against workers who raise concerns. Employers also may not shift the ultimate responsibility for compliance onto employees; handing out PPE without training, or writing a rule without enforcing it, does not satisfy the law. On multi-employer construction sites, OSHA can cite more than one employer for the same hazard: the employer who created it, the one who controlled it, the one exposing its own workers, and the one responsible for correcting it. Understanding that the burden sits with the employer, not the worker, frames every other topic in this course, because the standards exist to tell employers exactly what a safe workplace requires.
Inspections and Citations
OSHA enforces its standards through workplace inspections conducted by compliance safety and health officers, governed by 29 CFR Part 1903. Because OSHA has far more workplaces than inspectors, it prioritizes inspections in a set order: first, imminent-danger situations that could immediately cause death or serious harm; second, fatalities and catastrophes; third, worker complaints and referrals alleging violations; fourth, programmed inspections targeting high-hazard industries such as construction; and finally follow-up inspections to verify a hazard was corrected. Inspections are generally conducted without advance notice; giving unauthorized advance notice of an OSHA inspection is itself a criminal offense under the Act. A typical inspection has three stages: an opening conference where the officer explains the reason for the visit, a walkaround of the site where the officer looks for hazards and may take photos, measurements, and samples while accompanied by an employer and an employee representative, and a closing conference where findings are discussed. If the officer finds violations, OSHA may issue citations. Each citation names the standard violated, describes the hazard, states a proposed penalty, and sets an abatement date, the deadline by which the employer must correct the condition. The employer must post the citation at or near the location of the violation for three days or until it is corrected, whichever is longer. Violations are classified by severity: other-than-serious, serious (a substantial probability of death or serious harm), willful (intentional disregard or plain indifference to the law), repeat, and failure-to-abate. Willful and repeat violations carry by far the highest penalties, and a willful violation that causes a worker's death can bring criminal prosecution. An employer who disagrees with a citation may contest it before the independent Occupational Safety and Health Review Commission. For the worker, the key point is that citations are public, must be posted, and document exactly what went wrong.
Recordkeeping and Reporting
Tracking injuries and illnesses is how hazards get spotted before they repeat, so 29 CFR Part 1904 requires many employers to keep formal records. Employers with more than ten employees, unless they fall in a partially exempt low-hazard industry, must maintain three forms: the OSHA Form 300, a running Log of Work-Related Injuries and Illnesses; the Form 301, a detailed Incident Report completed for each recordable case within seven calendar days; and the Form 300A, an Annual Summary. An injury or illness is recordable under 29 CFR 1904.7 if it is work-related and results in death, days away from work, restricted work or job transfer, medical treatment beyond first aid, loss of consciousness, or a significant diagnosis. The 300A summary must be certified by a company executive and posted where employees can see it from February 1 to April 30 each year, even if there were no recordable cases. Separate from routine recordkeeping, 29 CFR 1904.39 sets strict reporting deadlines that apply to virtually all employers, even small ones normally exempt from the log. A work-related fatality must be reported to OSHA within 8 hours of the employer learning of it. A work-related in-patient hospitalization, amputation, or loss of an eye must be reported within 24 hours. Reports can be made by phone to the local OSHA office, the toll-free 1-800-321-OSHA line, or an online form. Under 29 CFR 1904.33, the 300 Log, 301 reports, and 300A summary must be kept for five years following the calendar year they cover and updated if new information about a case emerges. It is illegal to discourage a worker from reporting an injury; policies that punish reporting, or automatic post-incident drug testing that deters it, can themselves violate 29 CFR 1904.35 and 1904.36. Accurate records are not paperwork for its own sake; they are the data that tells an employer where the next injury is likely to happen.
Last updated: September 2026
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