The Occupational Safety and Health Act is the 1970 federal law that requires nearly every private employer in the United States to keep its workplace free from serious hazards, and it created the Occupational Safety and Health Administration (OSHA) inside the Department of Labor to write the rules and enforce them. Signed on December 29, 1970, the Act reaches from chemical exposure limits in factories to ladder use on construction sites, and it backs its requirements with civil penalties that now run above $165,000 per violation for the most serious cases.
Who the Act Covers
Coverage is broad by design. The Act applies to virtually all private-sector employers regardless of size or industry, and it extends beyond the fifty states to the District of Columbia, Puerto Rico, the U.S. Virgin Islands, and other U.S. territories.1Office of the Law Revision Counsel. 29 U.S. Code 653 – Geographic Applicability Federal agencies must comply with the standards too, though the mechanics of enforcement against them differ from what private companies face.
A few groups sit outside the Act. Self-employed people working alone are not covered. Family farms that employ only immediate relatives are excluded. Workers whose safety is already regulated by another federal agency, such as miners under the Mine Safety and Health Administration or certain transportation workers under the Coast Guard, answer to those agencies instead.2Occupational Safety and Health Administration. Am I Covered by OSHA?
About half the states and territories run their own OSHA-approved programs. Twenty-two state plans cover both private-sector and government workers, and seven more cover only state and local government employees.3Occupational Safety and Health Administration. State Plans These state programs must be at least as protective as federal OSHA. If you work in a state-plan state, your employer answers to the state program for day-to-day enforcement rather than to federal OSHA.
What Employers Must Do
The General Duty Clause
Even where no specific regulation covers a particular hazard, employers are not off the hook. The General Duty Clause requires every covered employer to provide a workplace free from recognized hazards that are likely to cause death or serious physical harm.4Office of the Law Revision Counsel. 29 U.S. Code 654 – Duties of Employers and Employees A “recognized hazard” is one the employer or its industry generally knows about, not some exotic risk nobody could predict. In practice OSHA leans on this clause for problems like workplace violence, extreme heat, and ergonomic risks where detailed standards have not been written.
Specific Safety Standards
OSHA also maintains thousands of detailed rules organized by industry. General industry standards under 29 CFR Part 1910 cover most non-construction, non-maritime, and non-agricultural workplaces.5Occupational Safety and Health Administration. 29 CFR 1910 – Occupational Safety and Health Standards Construction has its own body of standards under 29 CFR Part 1926. A requirement that applies in a factory may not apply on a building site, and vice versa.
The standards address chemical exposure, machine guarding, fall protection, and much more. Employers must supply personal protective equipment like respirators, hard hats, and safety glasses at no cost to employees. The hazard communication standard requires Safety Data Sheets and clear chemical labeling so workers know what they are handling. Training runs through most standards, and OSHA reads its training requirements to mean the information must be delivered in a language and at a vocabulary level the employee actually understands. If an employer routinely gives work instructions in Spanish, safety training must also be delivered in Spanish.6Occupational Safety and Health Administration. OSHA Training Standards Policy Statements
The most frequently cited standards show where employers most often fall short. In fiscal year 2024 the top violations were fall protection in construction, hazard communication in general industry, ladder safety in construction, respiratory protection, and lockout/tagout for controlling hazardous energy.7Occupational Safety and Health Administration. Top 10 Most Frequently Cited Standards Fall protection has held the top spot for over a decade.
On shared worksites, OSHA can cite more than one employer for the same hazard under its multi-employer citation policy. A general contractor with supervisory authority, a subcontractor who created the condition, and any employer whose workers are exposed can all be on the hook at once.8Occupational Safety and Health Administration. Multi-Employer Citation Policy
Recordkeeping and Reporting
Most employers must maintain an OSHA 300 Log of work-related injuries and illnesses that involve medical treatment beyond first aid, days away from work, restricted duties, or job transfers. A summary of the prior year’s data, Form 300A, must be posted at the worksite from February 1 through April 30 each year.
Two categories of employers are partially exempt from the routine log. Employers with ten or fewer employees at all times during the previous calendar year do not need to keep it, counted company-wide rather than per location.9Occupational Safety and Health Administration. 1904.1 – Partial Exemption for Employers With 10 or Fewer Employees Employers in certain lower-hazard industries such as retail stores, financial institutions, law offices, and software publishers are also exempt regardless of size.10Occupational Safety and Health Administration. Non-Mandatory Appendix A to Subpart B – Partially Exempt Industries
The word “partial” matters. Every employer, exempt or not, must report a workplace fatality to OSHA within 8 hours and any in-patient hospitalization, amputation, or loss of an eye within 24 hours.11Occupational Safety and Health Administration. 1904.39 – Reporting Fatalities, Hospitalizations, Amputations, and Losses of an Eye Missing those deadlines can trigger fines on their own.
Larger employers submit injury data electronically through OSHA’s Injury Tracking Application by March 2 of the following year, and OSHA makes some of that information publicly searchable.12Occupational Safety and Health Administration. Injury Tracking Application User Guide
What Workers Can Do Under the Act
The Act gives workers enforceable rights, not just a hope that the employer will do the right thing. You can file a complaint with OSHA if you believe a hazard exists or a standard is being violated, and you can ask that your identity be kept confidential. You have the right to have an employee representative accompany the inspector during a walk-around. You are entitled to see your employer’s injury and illness records.
Refusing Dangerous Work
Under narrow conditions, you can legally refuse a specific task you believe will kill or seriously injure you. All four of these must be true: you asked the employer to fix the danger and the employer did not; you genuinely believe an imminent threat of death or serious injury exists; a reasonable person in your position would agree the danger is real; and there is not enough time to get the hazard corrected through an OSHA inspection.13Occupational Safety and Health Administration. Workers’ Right to Refuse Dangerous Work This is a high bar on purpose. It is not a general right to walk off the job. If the conditions are met, the recommended approach is to stay at the worksite and tell the employer you will not perform the specific task until the hazard is corrected.
Whistleblower Protection and the 30-Day Clock
Employers cannot fire, demote, transfer, or otherwise punish an employee for reporting an injury, filing an OSHA complaint, or taking part in an inspection or safety proceeding.14Whistleblower Protection Program. 29 U.S.C. 660 – Occupational Safety and Health Act, Section 11(c) If retaliation happens, you have 30 days from the retaliatory action to file a complaint with OSHA. That deadline is unforgiving, and most people who lose these cases lose them by waiting too long or by assuming the clock starts when the consequences hit rather than when they were first notified of the adverse action. OSHA can seek remedies including back pay and reinstatement.
What Happens When OSHA Inspects
OSHA covers roughly seven million worksites with a small force of inspectors, so it prioritizes visits in a set order: imminent-danger situations first, then reported fatalities and severe injuries, then worker complaints, then referrals from other agencies or the media, then programmed inspections of high-hazard industries, then follow-ups to confirm previously cited hazards were fixed.15Occupational Safety and Health Administration. OSHA Inspections Fact Sheet
A compliance officer usually arrives with no advance notice. The visit opens with a conference where the officer presents credentials, explains the scope, and reviews safety logs and training records. A walk-around follows, accompanied by both an employer representative and an employee representative, during which the officer may photograph conditions, take measurements, and privately interview employees.16Office of the Law Revision Counsel. 29 U.S. Code 657 – Inspections, Investigations, and Recordkeeping A closing conference wraps up with a discussion of what was found.
An employer can refuse entry. If that happens the officer withdraws, and OSHA typically returns with a court-issued inspection warrant.17Occupational Safety and Health Administration. 1903.4 – Objection to Inspection The refusal itself is not penalized, but the inspection almost always still happens.
Penalties and How to Contest Them
Civil penalties adjust annually for inflation. As of January 15, 2025:18Occupational Safety and Health Administration. Federal Civil Penalties Inflation Adjustment Act Annual Adjustments
- De minimis violations carry no fine.
- Other-than-serious and serious violations run up to $16,550 each.
- Willful violations run from $11,823 to $165,514 each.
- Repeated violations run up to $165,514 each.
- Failure to abate a previously cited hazard runs up to $16,550 per day past the deadline.
Criminal prosecution is possible when a willful violation directly causes an employee’s death. The OSH Act sets the first-offense penalty at up to $10,000 in fines and six months in prison, doubling on a second conviction.19Office of the Law Revision Counsel. 29 USC 666 – Civil and Criminal Penalties Under the federal Alternative Fines Act, courts can impose fines of up to $250,000 on an individual convicted of a misdemeanor resulting in death, and up to $500,000 on an organization.20Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine Criminal cases are rare and tend to involve fatalities where the conduct was egregious enough for referral to the Department of Justice.
An employer that disagrees with a citation or penalty has 15 working days from receipt to file a notice of contest with the Occupational Safety and Health Review Commission, an independent federal agency that hears these disputes.21Occupational Safety and Health Administration. 1903.17 – Employer and Employee Contests Before the Review Commission Miss that window and the citation and penalty automatically become a final order of the Commission, with no right to challenge them.22Occupational Safety and Health Administration. 29 CFR 2200.33 – Notices of Contest It is one of the tightest deadlines in administrative law, and employers who set the citation aside while they line up a lawyer sometimes discover they have already lost by default.