OSHA 10 is a 10-hour introductory safety course for entry-level workers who answer only for their own safety. OSHA 30 is a 30-hour course for supervisors, foremen, and anyone responsible for other people’s safety on the job. Neither card expires under federal law, but which one your project actually requires usually comes down to your state, your contract, or your job title, not a guess about which one “sounds more official.”
Quick Comparison
| Factor | OSHA 10 | OSHA 30 |
|---|---|---|
| Minimum training time | 10 hours (2 days min, 7.5 hrs/day cap) | 30 hours (4 days min, 7.5 hrs/day cap) |
| Built for | Entry-level workers, no supervisory duties | Supervisors, foremen, safety leads, PMs |
| Prerequisite | None | None, you can skip OSHA 10 entirely |
| Federal expiration | Never expires | Never expires |
| Online completion window | 180 days from enrollment | 180 days from enrollment |
| Passing requirement | 70% on final assessment, up to 3 attempts | 70% on final assessment, up to 3 attempts |
| Typical cost | $25–$90 | $150–$250 |
| Covers OSHA 10 content? | N/A | Yes, fully, plus expanded modules |
What’s Actually Inside the 10 Hours
Most guides say OSHA 10 covers “the basics” and leave it there. Here’s what that actually breaks down to in clock time, because it tells you whether a provider’s course is even legitimate:
- Introduction to OSHA: about 2 hours, covering worker rights, employer duties, and how to file a complaint
- The Focus Four hazards: roughly 4 hours combined, split across falls, electrocution, struck-by, and caught-in/between incidents, which together cause the majority of construction fatalities
- PPE and health hazards: about 1 hour combined
- Elective topics: 2 hours minimum, chosen from things like scaffolds, excavation, or hand and power tools
I’ve reviewed course outlines from providers whose “10-hour” course somehow compressed all of this into six actual instructional hours padded with menu screens and stock video. If a provider can’t tell you the hour breakdown by topic before you pay, that’s worth asking about directly.
What OSHA 30 Adds Beyond More Hours
OSHA 30 doesn’t just repeat the same material for longer. It adds an entire mandatory module called Managing Safety and Health, which walks supervisors through job site inspections, injury and illness prevention programs, and how to run a safety meeting that people actually pay attention to instead of tuning out.
It also goes deeper on hazards OSHA 10 only touches:
- Recordkeeping requirements, including OSHA 300 logs and incident reporting timelines
- Managing subcontractors and holding them to the same safety standard as direct employees
- Root cause analysis after an incident, rather than just first-aid response
- Motor vehicle safety, treated as a standalone module because vehicle-related incidents remain one of the leading causes of death in construction
One detail that trips people up: you can’t upgrade from OSHA 10 to OSHA 30. The extra 20 hours aren’t sold as a top-up, and hours don’t transfer between the two courses. If you already hold an OSHA 10 card and move into a lead role, you sit through the full 30-hour course from the start, not an additional 20 hours on top of what you’ve already done.
Where the Card Stops Being Optional
Most articles vaguely mention “some states require this” without naming which ones or the actual thresholds. Here’s the real breakdown, and it changes what you should do next:
- Connecticut: OSHA 10 required for any public building project over $100,000, funded wholly or partly by the state. Contractors must submit proof within 30 days of contract award.
- Massachusetts: OSHA 10 required before setting foot on any public worksite. The law specifically says “at least 10 hours,” so an OSHA 30 card satisfies it too.
- Missouri: OSHA 10 required for any public works project, state or municipal, with 60 days from your start date to complete it.
- New Hampshire: Required on public projects of $100,000 or more. Miss the deadline by 15 days after starting and you’re removed from the site.
- New York and Rhode Island: OSHA 10 required on public construction work, though New York City layers on its own separate requirement, covered below.
- Nevada: The broadest rule on record. All construction workers need OSHA 10, all supervisors need OSHA 30, and the same split applies to entertainment, convention services, and cannabis industries.
Beyond state law, most federal construction contracts require at least an OSHA 10 card as a baseline, and general contractors on private jobs frequently require it by contract even where no law forces the issue. A contract requirement isn’t optional just because it isn’t a statute. Show up without the card and you get sent home the same as if a law required it.
The NYC Curveball Almost Nobody Explains Properly
If you’re working construction in New York City specifically, OSHA 10 or OSHA 30 alone won’t get you on site. NYC’s Department of Buildings requires a separate 40-hour Site Safety Training (SST) card for most construction workers on sites under its site safety program.
The SST curriculum incorporates OSHA 10 or OSHA 30 hours as part of the 40, but it’s a distinct city credential with its own renewal cycle, separate from the federal card. Crews regularly show up with a perfectly valid OSHA 30 card from another state and still get turned away because nobody checked the NYC-specific requirement first. Before assuming your OSHA card alone gets you on a job in the city, confirm whether that specific site falls under SST rules.
How to Actually Verify a Card Is Real
This is the step almost every competitor skips entirely, and it matters more than people assume.
OSHA maintains a public Outreach Training Program lookup on osha.gov where you can search by trainer name or organization to confirm a provider is actually authorized. Do this before paying, not after. Fraudulent and unauthorized “OSHA certification” sites are common enough that OSHA publishes fraud alerts about them directly on its site. A card from an unauthorized provider is worthless on a real job site no matter how official the PDF looks.
If your physical card gets lost, you don’t retake the course. Providers keep completion records on file and can issue a replacement, though processing routinely takes a few weeks. Photograph both sides of your card the day it arrives so you have something to show a site supervisor in the meantime.
Picking Between Them When the Answer Isn’t Obvious
“Do you supervise anyone?” works for most people, but it breaks down in a few common situations:
- You’re new but expect to move into a lead role within a year or two. Going straight to OSHA 30 saves you from paying for both courses, since it has no prerequisite and skipping OSHA 10 costs you nothing in eligibility.
- You work across state lines. Check the strictest state you’ll actually be working in, not your home state. A card that satisfies Missouri’s rule won’t automatically satisfy Nevada’s supervisor requirement if your role shifts.
- Your title says “worker” but you informally direct a two-person crew. Job titles lag behind real responsibility constantly. If you’re the one telling someone else how to do a task safely, get OSHA 30. Insurance auditors and general contractors care about function, not your pay stub’s job code.
- You already hold OSHA 10 and just got promoted. You don’t retake anything from scratch as a refresher. Enroll directly in OSHA 30, since it assumes no prior training and covers the OSHA 10 material inside it.
Mistakes That Show Up on Real Job Sites
Field experience surfaces patterns a course description never will:
- Splitting the hours to “save time.” Some providers advertise compressed schedules that violate OSHA’s 7.5-hour daily cap. A 10-hour course finished in a single sitting breaks the two-day minimum and produces a non-compliant card, even if the certificate says “10-hour” on it.
- Confusing “OSHA certified” with the actual card. There’s no such thing as being “OSHA certified.” You receive a Department of Labor course completion card, not a certification. If a provider markets “OSHA certification” as a product, treat that wording as a red flag worth double-checking.
- Assuming a title change means a card upgrade happens automatically. It doesn’t. HR moving someone into a supervisory title on paper doesn’t retroactively give them OSHA 30 content. That gap is exactly where insurance claims get complicated after an incident.
- Ignoring the track mismatch. Both courses come in a Construction (29 CFR 1926) version and a General Industry (29 CFR 1910) version. Take the wrong one for your actual work and the card won’t satisfy a contractor’s requirement, meaning a full retake under the correct track.
What This Actually Costs an Employer, Beyond the Course Fee
Contractors budgeting for a crew’s training often price only the per-seat course fee and miss the bigger number: lost labor hours. OSHA 10 eats roughly one to two workdays per person. OSHA 30 eats four or more. For a five-person supervisory team, that’s potentially 20 lost workdays across a project, not counting the course fee itself.
Some contractors stagger OSHA 30 enrollment across slower seasons specifically to avoid pulling supervisors off active sites during peak months. Union apprenticeship programs frequently solve this differently by folding OSHA 10 or OSHA 30 hours directly into the standard apprenticeship curriculum, so the training happens as part of scheduled classroom time rather than as a separate pull from the job.
Frequently Asked Questions
Can I take OSHA 30 without ever taking OSHA 10?
Yes. OSHA 30 has no prerequisite and fully includes the OSHA 10 material inside its expanded curriculum.
Does an OSHA 10 or 30 card expire?
Not under federal law. Some states and employers set their own practical renewal window, often five years, even though the card technically stays valid forever.
Is an OSHA 10 or 30 card accepted if I completed it online?
Yes, as long as the provider is OSHA-authorized. The DOL card doesn’t note whether you trained online or in a classroom. Some union agreements and specific federal contract specs require classroom-only completion, so confirm that before enrolling if it might apply to you.
What happens if I show up to a job site with the wrong card?
You’ll typically be sent home the same day. On public projects with statutory requirements, like those in Connecticut or Missouri, the contractor can also face penalties for letting you on site without proof.
Do OSHA 10 and OSHA 30 cover industries differently?
Yes. Construction courses follow 29 CFR 1926, while General Industry courses follow 29 CFR 1910. Hour totals match, but the topic lists differ significantly, and warehousing, manufacturing, and healthcare workers typically need the General Industry version, not Construction.
If I already have OSHA 30, do I still need OSHA 10 in a state that requires it?
Almost never. Most state laws that mandate OSHA 10 explicitly accept OSHA 30 as satisfying the same requirement, since OSHA 30 covers everything in OSHA 10 and more.
Can my employer require OSHA 30 even if no state law does?
Yes. A contractual requirement from a general contractor or project owner is enforceable even where no statute exists, and many private commercial projects require it purely by contract.
How fast can I get a physical card after finishing the course?
Most authorized providers submit your completion record within about 10 business days, and the DOL mails the card roughly two weeks after that. Budget three to four weeks total, and ask your provider for an interim completion certificate if your job starts sooner.
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