OSHA cannot walk onto a job site and shut it down. That is the belief the agency’s own name invites and the one its statute does not support. The Occupational Safety and Health Act of 1970, Public Law 91-596, gives OSHA a right to inspect, a right to cite, and a right to ask a federal court to intervene when a hazard is close to killing someone. It does not give an inspector the unilateral authority to close the doors. Understanding OSHA means understanding those three separate powers and where each one actually stops.
The right the statute creates
Congress signed the Act on December 29, 1970, and it took effect the following spring. Section 651(b) states the purpose in one sentence: 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.” The obligation that purpose produces sits in 29 U.S.C. Section 654(a), known as the General Duty Clause, and it has two halves that get collapsed into one in most retellings. Section 654(a)(1) requires an employer to furnish “a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm.” Section 654(a)(2) separately requires the employer to comply with the specific standards OSHA has actually written, the numbered regulations on noise, fall protection, machine guarding, and the rest. The first clause is the backstop for everything the second clause has not yet gotten around to regulating; a hazard can violate the General Duty Clause with no specific standard on the books for it at all.
Federal OSHA is not the only OSHA
Roughly half the country is not actually inspected by federal OSHA at all. Section 18 of the Act, 29 U.S.C. Section 667, lets a state run its own occupational safety program in place of the federal one, so long as the Secretary of Labor approves a plan that meets eight statutory criteria: a designated state agency, adequate funding and staffing, inspection procedures that do not tip off the employer in advance, and coverage that extends to public employees, a category the federal Act does not reach on its own. The statute’s own phrase for the bar a state plan has to clear is that its standards be “at least as effective in providing safe and healthful employment” as the federal ones, and the Secretary keeps evaluating an approved plan for at least three years after approval and can withdraw it if the state stops meeting that bar. Twenty-eight states and territories, including California, Washington, and Michigan, run approved plans this way, according to OSHA’s own current state-plan listing, which is why an inspector who shows up at a warehouse in Sacramento works for Cal/OSHA and answers to state law, not the federal statute described above, even though the underlying rights trace back to the same 1970 Act.
How a complaint actually moves
A worker who sees a hazard does not need a lawyer or a union steward to start the process, though a representative of employees can file in their place. Under 29 CFR 1903.11, the complaint has to be in writing, signed, and specific enough to “set forth with reasonable particularity the grounds for the notice.” A worker can ask that their name be withheld from the employer, and OSHA generally honors that request in practice. The area director reviews the complaint and, if it looks credible, schedules an inspection “as soon as practicable,” and the inspection is not limited to only the hazard named in the filing. During that inspection, a representative authorized by the employees has the right to accompany the compliance officer, under 29 CFR 1903.8, the same walkaround right the employer’s own representative has. When the inspection produces a citation, 29 CFR 1903.16 requires the employer to post it, unedited, at or near the site of the violation, and to keep it up for three working days or until the hazard is abated, whichever is longer, whether or not the employer is contesting it. None of that machinery requires a worker to already be in a union, and none of it requires the hazard to have hurt anyone yet.
The complaint the worker who filed it is protected
Filing that complaint is itself a protected act. 29 U.S.C. Section 660(c)(1) makes it unlawful for an employer to discharge or “in any manner discriminate against any employee” for filing a complaint, testifying in a proceeding, or exercising any right the Act affords, whether or not the complaint leads to a citation. A worker who is fired, demoted, or otherwise punished for that has thirty days under Section 660(c)(2) to bring the retaliation to the Secretary of Labor, who then has ninety days under Section 660(c)(3) to notify the worker of a determination. Thirty days is short, and it runs from the date of the retaliation, not the date the worker learns the law exists.
Where the imminent-danger belief breaks
Most workers believe OSHA can shut a site down on the spot, and the agency’s actual imminent-danger power does not do that. 29 U.S.C. Section 662 gives United States district courts jurisdiction “upon petition of the Secretary, to restrain any conditions or practices in any place of employment which are such that a danger exists which could reasonably be expected to cause death or serious physical harm immediately.” The verb there is petition. OSHA does not issue the order; the Secretary of Labor asks a federal judge for one, the same way any party asks a court for injunctive relief, and the judge decides whether to grant it. That step exists because the statute gives OSHA no independent police power to close a business, only the standing to ask a court to. In practice this route is used sparingly and mostly for the narrowest, most acute hazards, a trench about to collapse, a confined space with no breathable air, because everything short of that runs through the ordinary citation and abatement process instead, which can take months.
What the numbers say about coverage
The honest limit on all of this is headcount against the size of the American workforce. OSHA’s own commonly used statistics page, current for fiscal year 2024, puts the federal and state compliance officer corps at about 1,850 inspectors responsible for roughly 130 million workers across more than 8 million worksites, which the agency itself states as about one compliance officer for every 70,000 workers. That ratio is the reason most hazardous workplaces are never inspected unless someone files a complaint, an injury gets reported, or the worksite falls into a targeted program. The statute’s rights exist on paper for every covered worker every day. The agency that enforces them has enough staff to reach a small share of them in any given year, and the complaint under Section 1903.11 is the mechanism that turns a paper right into an actual visit.
What this is not
This is a description of a federal statute and its implementing regulations, not legal advice, and a worker with a live safety problem or a retaliation claim should file directly with OSHA or talk to a lawyer rather than rely on a summary. The rights above run to employees generally; independent contractors and some categories of workers fall outside the Act’s coverage the same way they fall outside other federal labor protections, and that line is fact-specific enough that it is worth confirming for a particular job rather than assuming either way.
A trench box, correctly installed before anyone climbs down, does more for a worker than any citation issued after the fact. The statute’s whole design points the same direction: catch the hazard before Section 662 is the only tool left.