The Occupational Safety and Health Administration, almost universally called OSHA, was created on April 28, 1971. That is the day the agency officially opened for business. The legislation that gave birth to it, the Occupational Safety and Health Act of 1970, had been signed into law months earlier on December 29, 1970, by President Richard Nixon. Why the gap? Congress wrote a 120-day runway into the Act so federal officials could hire staff, draft initial standards, and stand up regional offices before anyone could be inspected.

If you only remember one date for an exam or a workplace safety briefing, remember April 28, 1971. Worker advocates now mark that day every year as Workers Memorial Day, a small but powerful reminder that OSHA exists because too many people went to work and never came home. Before 1971, on-the-job fatalities in the United States ran at roughly 14,000 per year. Today, with a workforce more than double the size, the figure sits closer to 5,200 a year. Numbers are still terrible, yet the trend tells you everything about why the agency was needed.

This article walks through the full story: the conditions that led to the OSH Act, the political fight over its creation, the early years of pushback, the major reforms, and where the agency stands today. By the end you will know not just when OSHA was created but why, how it actually functions, and what it means for any worker or employer who deals with general industry, construction, maritime, or agriculture.

To understand the agency you need to step back to the late 1960s. The American workplace had changed dramatically since World War II. Petrochemicals, asbestos, and exotic solvents were everywhere. Construction was booming. Mining accidents made national headlines, with the 1968 Farmington Mine disaster in West Virginia killing 78 miners on a single November morning. Union leaders, public health researchers, and a young environmental movement all pushed Washington for federal rules that would cover every private-sector workplace, not just isolated industries.

The political math was tricky. Republicans worried about regulatory overreach. Democrats wanted tough enforcement. Business groups argued that state-level rules were already enough. Labor unions, led by the AFL-CIO, said the patchwork of state laws had failed and that a true federal floor was the only fix. In the end the Williams-Steiger Occupational Safety and Health Act squeaked through both chambers in late 1970 with bipartisan support and was sent to President Nixon for signature.

Nixon signed it on December 29, 1970, with little ceremony. The Act did three big things at once. It created OSHA inside the Department of Labor to set standards and inspect workplaces. It created the Occupational Safety and Health Review Commission, an independent body that hears appeals. And it created the National Institute for Occupational Safety and Health, NIOSH, housed under the Department of Health, Education and Welfare, which does the research that underpins each standard. Three agencies, one mission.

The first OSHA was tiny. A few hundred inspectors had to cover a workforce of more than 75 million. George Guenther, a former garment industry executive, was tapped as the agencys first Assistant Secretary of Labor for Occupational Safety and Health. His team had a fast deadline written into the Act: within 30 months they had to adopt national consensus standards from sources like the American National Standards Institute and the National Fire Protection Association. They got it done, mostly by lifting existing voluntary codes wholesale and turning them into law.

That shortcut created some early headaches. A few of the adopted rules read like 1950s plumbing manuals. Restaurants got told how many cuspidors a room could have. Critics on Capitol Hill loved those examples and read them aloud during oversight hearings. The agency spent years quietly pruning the silliest provisions while it built out real, hazard-based standards for things like asbestos, vinyl chloride, lead, and noise exposure.

Inspections began that summer of 1971. The first official OSHA inspection took place at a small Massachusetts shipyard in Quincy in July of that year. The agency issued its first citations within weeks. Employers were stunned. For decades safety had been a private matter between a worker and a supervisor. Suddenly a federal inspector could show up unannounced, ask to see the logbook, and fine the company for missing machine guards.

The agency has had a bumpy political life. Through the 1970s it leaned aggressive. Eula Bingham, appointed by President Carter, pushed major rules on cotton dust, lead, and benzene. Her team rewrote the cancer policy and tried to streamline inspections so that the worst hazards got attention first. Business groups sued constantly. The Supreme Court, in the 1980 case Industrial Union Department v. American Petroleum Institute, struck down OSHAs benzene rule and forced the agency to prove a significant risk before tightening any chemical limit. That ruling still shapes rulemaking today.

Under President Reagan the agency shrank. Budgets were cut, inspectors were reassigned, and the leadership took a cooperative approach with industry. Critics said it was deregulation through starvation. Supporters said OSHA had grown too punitive. The pendulum swung again under President Clinton, with new ergonomics rules and an emphasis on partnership programs. Then Congress repealed the ergonomics rule under the Congressional Review Act in 2001, and OSHA went two decades without a single major comprehensive ergonomics standard.

The 2000s brought the BP Texas City refinery explosion, the Imperial Sugar dust explosion, and the Upper Big Branch mine disaster. Each one led to investigations, fines in the millions, and renewed calls for stronger penalties. The 2010s saw a long-overdue update of the chemical Hazard Communication Standard to align with the global GHS labeling system. The 2020s opened with the COVID-19 pandemic and an emergency temporary standard that became a Supreme Court case before being withdrawn. Through every era, the underlying mission has stayed the same: send workers home alive.

So who is actually covered today? Most private-sector employers and their workers in the 50 states, the District of Columbia, and U.S. territories fall under either federal OSHA or an OSHA-approved state plan. Federal OSHA itself covers roughly 8 million workers in states without their own plan. State plans cover another 100 million. Some categories sit outside the law on purpose. Self-employed people are not covered. Immediate family members on family farms are not covered. Workplaces regulated by another federal agency, such as mines under MSHA or commercial fishing vessels under the Coast Guard, are typically not under OSHA.

Public-sector coverage is more complicated. Federal employees are covered by Section 19 of the OSH Act, with each agency required to run a safety program. State and local government workers are only covered if the state has chosen to run a state plan. That gap means a city sanitation worker in one state might have full OSHA protections while the same job in another state has none under federal law.

For an employer the practical question is, what rules apply to me? The answer almost always starts with 29 CFR Part 1910, which is general industry. Construction sits in 29 CFR 1926. Maritime is split across 1915, 1917, and 1918. Agriculture is in 1928. There is also a small but powerful catch-all called the General Duty Clause, Section 5(a)(1) of the OSH Act, which requires every employer to furnish a workplace free from recognized hazards that are causing or likely to cause death or serious physical harm, even if no specific standard exists yet.

Inspections are how OSHA puts teeth into the law. There are five basic triggers. The first is imminent danger, where a hazard could cause death or serious harm within hours. Those go to the front of the line. The second is a fatality or catastrophe, defined as an event that kills a worker or hospitalizes three or more. The third is a worker complaint or referral, which OSHA must keep confidential. The fourth is a programmed inspection, scheduled by industry or hazard. The fifth is a follow-up to see whether an earlier citation was actually fixed.

Once inspectors arrive they show credentials, open with a brief meeting, walk through the site, take photographs and air samples, interview workers privately, and review records like the OSHA 300 log of injuries. They close out with a wrap-up meeting and explain what they saw. Citations and proposed penalties come later, typically within six months of the opening conference. Employers have 15 working days to contest in writing if they disagree.

Penalties are tiered. Other-than-serious violations carry small fines. Serious violations, where death or serious harm could result, can run up to about $16,131 per violation as of 2025. Willful or repeated violations, where the employer knew and ignored the rule, can run up to $161,323 per violation. A single fatal incident with multiple willful violations can stack into seven figures very quickly. Criminal referrals to the Department of Justice are rare but happen.

The agency does much more than write rules and inspect. It also runs a training and outreach arm that touches millions of workers every year. The OSHA 10-hour and 30-hour outreach courses are recognized across construction and general industry. Susan Harwood Training Grants fund nonprofits and community colleges to deliver bilingual, hazard-focused training. The agencys Voluntary Protection Programs, or VPP, recognize employers with mature safety systems and exempt them from programmed inspections. Strategic Partnerships pair OSHA with trade groups on specific hazards like trenching or grain handling.

OSHA also enforces more than two dozen whistleblower laws. If a worker is fired for raising a safety concern, they have 30 days to file under the OSH Act. Other statutes covering aviation, trucking, food safety, environmental whistleblowing, financial fraud, and pipeline safety have longer windows. The whistleblower office sits inside OSHA but is funded and run separately. It is one of the busiest parts of the agency.

Internationally the agency works through the International Labour Organization and signs memorandums of understanding with countries that want to model their own safety programs. Visitors from across Asia, Latin America, and Africa regularly tour federal OSHA training facilities in Arlington Heights, Illinois, where the OSHA Training Institute educates compliance officers, safety professionals, and university faculty.

Looking ahead, the agencys to-do list is long. A federal heat-related illness standard is in active rulemaking, with comments and hearings already complete. Workplace violence in healthcare and social assistance is in proposed rule territory. Infectious disease standards for healthcare, prompted by COVID, are still being shaped. Updates to lead and silica continue. Each one will take years and survive court challenges before it lands in the Federal Register as a final rule.

Funding remains a chronic worry. The agencys annual budget hovers near $632 million, which sounds large until you compare it to the size of the American economy. Federal OSHA staffs about 750 inspectors. Combined with state-plan counterparts, the total is somewhere near 1,800. Divided across more than 11 million establishments, that works out to one inspector for every 6,000 to 8,000 workplaces. Every administration since Carter has been asked to grow the inspector corps, and every administration has reached different compromises with Congress on the appropriations bill. The result is a slow drift rather than a clear trend.

Technology is reshaping enforcement too. OSHA now accepts online complaints around the clock. Form 300A injury data is uploaded to the agency through an electronic Injury Tracking Application, which lets researchers and journalists analyze trends in near real time. Drones have been used in post-disaster inspections where buildings were unsafe to enter. Wearable heat-stress monitors are showing up in pilot studies funded through NIOSH. None of this replaces the boots-on-the-ground inspector, but it stretches the agencys limited reach further than ever before.

For someone studying for an OSHA 10 card, an OSHA 30 card, or a Certified Safety Professional exam, the date you absolutely must know is April 28, 1971. The supporting facts you should keep ready are December 29, 1970, for the OSH Act signing, Nixon as the signing president, the three agencies created (OSHA, NIOSH, and OSHRC), and the General Duty Clause. After that, focus on the structure of 29 CFR, the inspection priorities, worker rights, and recordkeeping basics. Those fundamentals show up on virtually every safety-related exam in the United States.

OSHA turned 54 in 2025. It has outlived political fights, court battles, hostile budgets, and five decades of industrial change. Workplaces today are not perfectly safe and likely never will be. But the average worker has a far better chance of going home in one piece than in 1970, and a huge share of that credit belongs to the small, often underfunded agency that opened its doors on April 28, 1971.

The bottom line, repeated one more time because it is the question most people search for: OSHA was created on April 28, 1971. The legal foundation, the Occupational Safety and Health Act of 1970, was signed on December 29, 1970. Three sister agencies were born from the same Act, OSHA for enforcement, NIOSH for research, and OSHRC for appeals. Every workplace safety story in the United States since then traces back to those two dates and that single law.

If you are preparing for an OSHA-related test, an industrial certification, or simply want to answer the trivia question with confidence, anchor the date in your memory and build out from there. The agencys history is full of policy battles, but its core mission has stayed steady for more than half a century: every worker, every day, deserves to come home safe.