OSHA 10 vs OSHA 30: Which One Do You Actually Need?

Almost every page that answers this question tells you the 10-hour is for workers and the 30-hour is for supervisors, which is true and useless, because the people asking are usually not sure which one they are. There is a sharper test, and it comes out of a state statute rather than out of marketing copy. If you already know a specific state or city applies to you, check what it actually requires first, because a law overrides every general rule below.

What the federal program says

OSHA draws the line by role, not by rank or years on the job:

The 10-hour class is intended to provide workers with awareness of common job-related safety and health hazards, while the 30-hour class is more appropriate for supervisors or workers with some safety responsibility.

Read on OSHA's Outreach Training Program page on August 8, 2026. Two things in that sentence get skipped. The first is "more appropriate", which is guidance and not a rule: at the federal level the whole program is voluntary and does not satisfy any OSHA standard. The second is the phrase "or workers with some safety responsibility", which quietly widens the 30-hour audience past supervisors to anyone carrying a safety role, whether or not they manage people.

The test that actually decides it

Where the choice stops being a preference and becomes a legal fact is in a state with a mandate. Nevada is the useful case, because it defines the dividing term instead of assuming everyone knows it:

Supervisory employee means any person having authority in the interest of the employer to hire, transfer, suspend, lay off, recall, promote, discharge, assign, reward or discipline other employees

Read that list against your own week. Can you assign someone their work? Send someone home? Recommend a raise, or a write up? If yes, Nevada considers you a supervisory employee, and there the answer is not a suggestion:

Not later than 15 days after the date a supervisory employee is hired, the supervisory employee must obtain a completion card for an OSHA-30 course

Notice what is absent from that definition. Not your job title, not your pay, not how long you have been in the trade. A working foreman who still swings a hammer all day but can send someone home is on the 30-hour side of the line. A twenty year journeyman with no authority over anyone else is on the 10-hour side. The full Nevada rule and its deadlines are on our jurisdiction page.

Nevada's definition has no force outside Nevada. It is still the best available test, because it describes the thing the federal guidance is gesturing at, and because if your own state ever writes a mandate it will have to draw the line in similar terms.

Where the general rule flips

New York City is the exception that costs people money. There the requirement is not an OSHA card at all but a Site Safety Training card, and the two accepted routes to it are not symmetric. Starting from OSHA 30, you add an 8-hour Fall Prevention course and a 2-hour Mental Health Awareness course and you are done. Starting from OSHA 10, you add four more courses and eight hours of electives to reach the same 40.

So in New York City an ordinary worker with no authority over anybody is usually better off buying the 30-hour course, even though every general guide would point them at the 10. The New York City requirements, including which provider registry issues the card, are worth reading before you buy anything.

Choosing when nobody has told you which

1. Check whether a state or city mandate covers you. If one does, it decides, and it may decide differently for you than for the person next to you on the same site.
2. If no mandate applies, ask whoever is requiring the card which one they want. An employer who asked for "OSHA training" and meant the 30-hour will not accept the 10-hour, and you will have paid twice.
3. If nobody has specified and you have no authority over other workers, the 10-hour is the course the federal guidance points you to.
4. If you have that authority, or you hold any formal safety role, take the 30-hour even where no law forces it. That is what the sentence above is describing.

What is the same either way

Both courses are voluntary at the federal level, both end in a Department of Labor completion card issued through an authorized trainer, and neither one is a certification. OSHA is explicit that none of the Outreach courses is considered one, which is why "OSHA 30 certified" is a phrase you will see everywhere and never on a government page.

The 30-hour is the longer course and the more expensive one. What each provider charges for each, with the date we verified it and an honest count of the cells we have not been able to fill yet, is on the comparison table.