An OSHA serious violation penalty currently tops out at $16,550 for each violation, and unlike lesser citations, the fine is mandatory: the agency has to assess something. A serious violation is what OSHA calls a workplace hazard that could cause death or significant physical harm when the employer knew, or with reasonable diligence should have known, the danger was there. One inspection can produce several of these citations at once, and the dollars add up fast.
What Makes a Violation “Serious”
Section 17(k) of the Occupational Safety and Health Act sets the definition, and it rests on two things: how bad the potential injury is, and whether the employer had knowledge of the hazard.1Occupational Safety and Health Administration. Occupational Safety and Health Act of 1970 – Section 17
The severity test is often misread. “Substantial probability” does not mean an accident is likely. It means that if something goes wrong, the resulting injury would probably be severe. A worker on a scaffold with no guardrail may never fall, but a 20-foot drop almost certainly produces serious harm. That is enough. Serious physical harm includes injuries requiring hospitalization, causing lasting impairment, or producing chronic illness: deep lacerations needing surgery, third-degree burns, broken bones, lung disease from toxic exposure. Cuts and bruises handled with basic first aid do not qualify.
The knowledge test is where most disputes live. Actual knowledge is easy to spot: a supervisor walked past exposed wiring and did nothing, or a manager was told about a missing machine guard and ignored it. Constructive knowledge reaches further. If a routine safety walkthrough would have revealed the hazard, OSHA treats the employer as having known, whether or not anyone actually looked. “We didn’t know” only works if the hazard was genuinely undetectable through normal oversight.
The Penalty: Mandatory, Per Violation, Up to $16,550
Section 17(b) of the OSH Act says every employer cited for a serious violation “shall” be assessed a civil penalty.1Occupational Safety and Health Administration. Occupational Safety and Health Act of 1970 – Section 17 That word matters. Other-than-serious citations can carry a $0 fine; serious ones cannot.
The current ceiling is $16,550 per violation for penalties assessed after January 15, 2025.2Occupational Safety and Health Administration. OSHA Penalties The Federal Civil Penalties Inflation Adjustment Act requires yearly updates, though the adjustment can be zero if inflation metrics don’t warrant a change. Fines are paid to the federal treasury, not to injured workers. Each cited hazard carries its own penalty, so a single inspection that finds four serious problems produces four separate assessments.
How OSHA Sets the Actual Dollar Amount
The $16,550 figure is a ceiling, not a starting point. Most citations land well below it because OSHA runs a gravity-based calculation and then applies adjustments.
Gravity Comes First
Inspectors weigh two things: the severity of the likely injury (high, medium, or low) and the probability that an injury would occur (greater or lesser). A high-severity, high-probability hazard starts at or near the maximum. A low-severity, low-probability hazard starts far lower. That combination produces the gravity-based penalty, which is the baseline before any credits.
Size, Good Faith, and History Credits
OSHA revised its adjustment guidelines in July 2025, and the changes favor smaller employers.3Occupational Safety and Health Administration. US Department of Labor Updates Penalty Guidelines to Support Small Businesses and Eliminate Workplace Hazards The 70% size-based reduction, previously reserved for businesses with 10 or fewer workers, now covers employers with up to 25 employees. Larger companies get smaller reductions, or none at all.
Two other credits stack on top. Employers who correct the hazard immediately after it is identified can receive a 15% reduction. Employers with a clean inspection history, meaning either never inspected or inspected within the past five years with no serious, willful, or failure-to-abate violations, qualify for a 20% reduction.3Occupational Safety and Health Administration. US Department of Labor Updates Penalty Guidelines to Support Small Businesses and Eliminate Workplace Hazards A small employer with no prior violations who fixes the problem on the spot can see the initial number cut dramatically. OSHA keeps discretion to withhold any credit when granting it would not advance the purposes of the Act, so a pattern of exposing workers to the same hazard undercuts eligibility even when the employer qualifies on paper.
How Serious Stacks Against Other Citation Types
The maximums effective after January 15, 2025 tell the story of where serious sits and how much worse it can get:2Occupational Safety and Health Administration. OSHA Penalties
- Other-than-serious: same $16,550 ceiling per violation, but no mandatory minimum, and many carry no fine at all.
- Serious: up to $16,550 per violation, with a mandatory penalty.
- Willful or repeated: up to $165,514 per violation. Willful means the employer intentionally disregarded a known requirement or showed plain indifference to worker safety. Repeated means a substantially similar condition the employer was cited for before.
- Failure to abate: up to $16,550 per day past the abatement deadline. This is where costs compound fastest, because the meter runs daily until the hazard is fixed.
A serious citation can escalate. It becomes willful if evidence shows the employer knew a specific standard applied and consciously chose to ignore it, and it becomes repeated if a prior citation for a substantially similar condition became a final order.4Occupational Safety and Health Administration. OSHA Policy Concerning Repeat Violations and Requirements for PRCS Sign Posting If a willful violation causes a worker’s death, criminal exposure enters the picture: up to six months in prison and a $10,000 fine for a first offense, doubling to one year and $20,000 for a subsequent conviction.1Occupational Safety and Health Administration. Occupational Safety and Health Act of 1970 – Section 17
The 15-Working-Day Contest Deadline
An employer who wants to challenge a citation, the proposed penalty, or the abatement date must file a written notice of contest with the OSHA Area Director within 15 working days of receiving the penalty notice.5Occupational Safety and Health Administration. Employer and Employee Contests Before the Review Commission Miss that window and the citation becomes a final order. No appeal, no negotiation, full penalty owed. The notice must state whether the challenge is to the citation itself, the penalty, or both.
Before filing, employers can ask the Area Director for an informal conference to discuss the citation, penalty, or abatement timeline.6Occupational Safety and Health Administration. Informal Conferences These sometimes produce reduced penalties or revised abatement dates. One trap: the informal conference does not extend the 15-working-day contest deadline. Employers who spend those weeks negotiating and forget to file the formal notice lose the right to a hearing.
Fixing the Hazard and Proving It
The citation itself has to be posted at or near the location where the violation occurred, unedited, until the hazard is corrected or for three working days, whichever is longer. If the worksite is mobile or dispersed, it goes in a prominent place where affected employees can see it. Covering, altering, or removing it early is a separate violation.7Occupational Safety and Health Administration. Posting of Citations
Within 10 calendar days after the abatement deadline, the employer must send OSHA a written certification that each cited violation has been corrected, including the date, the method, and a statement that affected employees were informed.8Occupational Safety and Health Administration. Abatement Verification For serious violations, OSHA may require documentation such as photographs, purchase receipts for replacement equipment, or repair records. Affected employees must be notified of abatement activities at the same time or before the information is sent to OSHA, and they have the right to examine and copy the documents submitted. If the serious violation involves movable equipment, a warning tag or copy of the citation must be attached to the operating controls until the hazard is corrected and verification is filed.
If the employer has genuinely tried to fix the hazard but cannot meet the deadline because of circumstances beyond their control, they can file a Petition for Modification of Abatement with the Area Director no later than the close of the next working day after the original deadline.9Occupational Safety and Health Administration. Petitions for Modification of Abatement Date The petition has to explain what steps have been taken, how much additional time is needed, and what interim protections are in place for workers. A copy must be posted where affected employees can see it for at least 10 working days.
If You’re in a State-Plan State
Federal OSHA does not cover every workplace directly. Twenty-two states run their own OSHA-approved plans covering both private-sector and government workers, and seven more have plans covering only state and local government employees.10Occupational Safety and Health Administration. State Plans State programs have to be at least as effective as federal OSHA, but they can set stricter standards and higher penalties. If your business operates under a state plan, the numbers above are a starting reference, not the figure you will actually pay. Check the state plan’s own penalty schedule.