OSHA was created because American workplaces were killing roughly 14,000 workers a year by the end of the 1960s, injuring more than two million others, and the loose collection of state and local safety rules in place at the time was not stopping it. Congress answered with the Occupational Safety and Health Act of 1970, which established the Occupational Safety and Health Administration inside the Department of Labor and gave a single federal agency the power to set enforceable safety standards, inspect job sites, and penalize employers who put workers at risk.
The Conditions That Forced Congress to Act
Before 1970, whether a factory worker went home safe depended largely on the state they worked in. Safety was governed by a patchwork of state and local rules that varied dramatically from one jurisdiction to the next, and rapid industrial expansion after World War II had introduced complex chemicals, faster machinery, and larger-scale operations that the older rules were never written to handle.
The numbers made the case on their own. Disabling workplace injuries rose 20 percent during the 1960s, and the annual death toll of 14,000 workers showed no sign of falling.1Occupational Safety and Health Administration. OSHA’s 30th Anniversary Representative Carl D. Perkins pointed out that the number of Americans killed on the job in just four years had surpassed nearly a decade of combat deaths in Vietnam. President Lyndon Johnson told Congress in 1968 that it was “the shame of a modern industrial nation” that so many workers were being killed and injured each year, blaming inadequate standards, poor enforcement, and a patchwork of ineffective federal laws.2U.S. Department of Labor. The Job Safety Law of 1970 – Its Passage Was Perilous
Public pressure for a unified national response eventually became impossible to ignore. The core problem was structural: no federal agency had authority to set binding safety rules across industries, and no consistent inspection system existed to make sure rules that did exist were followed.
What Congress Passed in 1970
After a three-year legislative fight, Congress passed the Williams-Steiger Occupational Safety and Health Act. President Richard Nixon signed it into law on December 29, 1970, at a ceremony attended by labor leaders, business figures, and members of Congress from both parties.2U.S. Department of Labor. The Job Safety Law of 1970 – Its Passage Was Perilous The law took effect on April 28, 1971, and OSHA opened its doors inside the Department of Labor.3Occupational Safety and Health Administration. OSHA at 50
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 and to preserve our human resources.”4Occupational Safety and Health Administration. OSH Act – Congressional Findings and Purpose To make that purpose real, the law did three things at once. It authorized the Secretary of Labor to issue mandatory safety and health standards for businesses engaged in interstate commerce. It created the Occupational Safety and Health Review Commission as an independent body to hear disputes over citations. And it established the National Institute for Occupational Safety and Health (NIOSH) as a separate research agency.5GovInfo. 29 USC 671 – National Institute for Occupational Safety and Health Splitting enforcement from research let the government ground its rules in scientific evidence while keeping its enforcement arm independent.
The General Duty Clause
The heart of OSHA’s authority is the General Duty Clause, which requires every employer to provide a workplace “free from recognized hazards that are causing or are likely to cause death or serious physical harm.”6Office of the Law Revision Counsel. 29 USC 654 – Duties of Employers and Employees This clause was written as a safety net. Even when no specific standard covers a particular danger, OSHA can still cite an employer if the hazard is widely known in the industry and poses a serious risk. Congress understood that no rulebook could anticipate every hazard, and the General Duty Clause was the answer.
The Hazards OSHA Targeted First
When OSHA opened in 1971, it moved quickly against some of the most widespread industrial dangers. The early enforcement targets show what Congress had in mind when it wrote the law.
Asbestos
Asbestos was one of the first substances OSHA regulated. Widely used in construction and insulation, its fibers cause lung cancer, mesothelioma, and chronic scarring of the lungs. OSHA issued an emergency standard for asbestos dust in December 1971, capping how much workers could be exposed to.7Occupational Safety and Health Administration. Asbestos – Federal Register Publication 12/07/1971 Those permissible exposure limits have been tightened several times since as scientific understanding of asbestos-related disease has grown.
Occupational Noise
Excessive noise in manufacturing plants was another early priority. OSHA set a permissible exposure limit of 90 decibels measured over an eight-hour workday, with the allowable exposure time cut in half for every 5-decibel increase above that level.8Occupational Safety and Health Administration. 29 CFR 1910.95 – Occupational Noise Exposure Employers whose workers are exposed to noise at or above 85 decibels over an eight-hour shift must also run a hearing conservation program with regular audiometric testing and hearing protection.9Occupational Safety and Health Administration. Occupational Noise Exposure – Overview
Unguarded Machinery
Unguarded machinery was a leading source of amputations and crushing injuries. OSHA’s general machine guarding standard requires employers to install physical barriers, two-hand controls, electronic safety devices, or other protective measures wherever workers are exposed to hazards from moving parts, pinch points, rotating components, or flying debris.10eCFR. 29 CFR 1910.212 – General Requirements for All Machines Injuries of this kind had long been treated as an unavoidable cost of production. The new standard treated them as preventable failures.
How the Agency’s Focus Has Grown
The hazards Congress had in mind in 1970 are still regulated, but the agency’s attention has widened. Infectious disease transmission in healthcare settings is now addressed through several overlapping standards, including the Bloodborne Pathogens standard, the Personal Protective Equipment standard, and the Respiratory Protection standard.11Occupational Safety and Health Administration. Healthcare – Infectious Diseases Where no specific standard exists, such as for tuberculosis exposure, OSHA falls back on the General Duty Clause the original Act wrote in.
Heat-related illness in outdoor and indoor work has become a major enforcement focus. OSHA has maintained a National Emphasis Program for heat hazards, extended through April 2026, under which regional offices conduct targeted inspections and prioritize fatality investigations and complaints involving heat exposure.12Occupational Safety and Health Administration. Extension of National Emphasis Program – Outdoor and Indoor Heat-Related Hazards That kind of program lets the agency concentrate on emerging risks without waiting for a permanent standard to work its way through rulemaking.
Whether the Original Purpose Has Been Met
The numbers tell a clear story. When OSHA was created, roughly 14,000 workers died on the job each year.2U.S. Department of Labor. The Job Safety Law of 1970 – Its Passage Was Perilous By 2018, that figure had dropped to roughly 5,250 annual workplace deaths, a decline of more than 60 percent, even as the U.S. workforce nearly doubled over the same period. High-hazard industries such as construction saw some of the largest reductions in both the number and rate of fatalities. No single law can eliminate workplace danger, but creating a federal agency with the authority to set standards, inspect job sites, and hold employers financially accountable changed the relationship between American workers and the conditions they work in.