OSHA 10 vs OSHA 30: Which Does Your California Crew Need?

Every few weeks I get a call that starts the same way. A contractor won a bid, the general contractor's prequalification packet demands OSHA 10 cards for every worker and an OSHA 30 for the foreman, and mobilization is two weeks out. After fifteen years of consulting for California construction companies, I can tell you the confusion between these two classes delays more start dates than any permit ever has.

This post covers what each course includes, who on your crew needs which card, and where the requirement actually comes from, because in California it almost never comes from a statute.

What is the difference between OSHA 10 and OSHA 30?

Both classes belong to the federal OSHA Outreach Training Program, which has trained workers since 1971. An OSHA authorized trainer teaches the course and issues a Department of Labor completion card afterward, the card GCs ask to photograph at orientation.

Per OSHA's outreach training pages, the split works like this:

• OSHA 10 is intended for entry level workers. It builds awareness of the hazards a worker is likely to meet on site, along with workers' rights, employer responsibilities, and how to file a complaint.
• OSHA 30 is intended for supervisors and workers who carry some safety responsibility. It covers the same ground in greater depth and adds breadth across more hazard categories.

Construction has its own track within the program, separate from general industry. If your crew builds, they need the construction course. A general industry card on a construction prequalification form is one of the most common reasons packets bounce back.

Does California law require OSHA 10 or OSHA 30?

Here is the part that surprises people. OSHA states plainly on its outreach pages that the program is voluntary, does not meet the training requirements in any OSHA standard, and is not a certification. California has no blanket statute that makes an OSHA 10 card a condition of working private construction either, though some states have written outreach training into law and some public agencies require it by contract.

So where does the pressure come from? Contracts. General contractors write OSHA 10 into subcontract prequalification. Owners write OSHA 30 for supervision into master agreements. Public works bid documents and refinery or utility site access rules pile on. The law may call the program voluntary, but the market has made it mandatory, and arguing with a GC's compliance portal is a losing trade.

One more wrinkle: an outreach card does nothing to satisfy Cal/OSHA's actual training requirements. Cal/OSHA expects hazard specific, documented training under your Injury and Illness Prevention Program, plus standard specific training for work like fall protection, scaffolds, excavation, and silica. I broke down what that program has to contain in my post on IIPP requirements for construction companies.

Who on your crew should take OSHA 10?

My rule for field crews is short: every worker who touches the work should hold a current OSHA 10 construction card. That includes apprentices, laborers, operators, and the new hire who swears his card is in a drawer at his last employer's office. Cards follow the worker, not the company, so collect copies at hire and track the dates yourself.

The 10 hour class earns its keep with newer workers. The hazard awareness content maps to the incidents that actually hurt people in this state: falls, struck by equipment, trench collapses, electrical contact. A crew that has sat through it speaks the same hazard language your foreman uses at the morning huddle.

Who should take OSHA 30?

Anyone who directs work. Foremen, superintendents, project managers who walk sites, and the lead you are grooming for a foreman slot. GCs increasingly require an OSHA 30 for anyone listed as site supervision on a project, and the class gives supervisors enough depth to recognize hazards across trades they do not personally practice.

Two cautions from the field. First, an OSHA 30 does not make anyone a competent person. Competent person status under OSHA standards requires the ability to identify hazards and the authority to correct them, plus knowledge specific to the operation, whether that is scaffolding, excavation, or fall protection. Second, sending a superintendent to a 30 hour class does not discharge your training duties as an employer. Those duties stay with the company.

Do OSHA 10 and OSHA 30 cards expire?

Federal OSHA does not print an expiration date on construction outreach cards. Two practical limits still apply. Trainers and online providers can only replace or verify a card for training completed within the past five years, because that is how long they keep class records. And many GCs, owners, and site access programs treat a card older than five years as stale and require a fresh class.

My advice: budget a refresher on a five year cycle and skip the argument at the trailer window.

How do you get your crew trained without losing production days?

A 10 hour class realistically takes two days and a 30 hour class stretches across four or more, so the schedule matters as much as the content. A few things I have learned running these classes for California crews:

1. Train in the gaps. Book classes between projects or during rain delays instead of pulling a crew off active work.
2. Verify the trainer. Every OSHA authorized trainer carries a trainer card with an expiration date and the name of the authorizing OSHA Training Institute Education Center. Ask to see it. OSHA also publishes a watch list of trainers whose authorizations were suspended or revoked.
3. Pick construction, in person, in the language your crew speaks. Online courses through OSHA authorized providers are legitimate, and OSHA allows trainers to tailor topics to the audience. A live class built around your scopes of work sticks better than a browser window fighting a lunch break.

I run OSHA 10 and OSHA 30 construction classes for crews across Southern California, scheduled around your production calendar. Details are on my training page. If training is one gap among several, my fractional EHS service covers the whole program, or you can book a call at 949-954-6581 and we will figure out which card each role on your roster needs.

Frequently asked questions

Is OSHA 10 required by law in California?

No statewide law makes OSHA 10 a condition of private construction work in California, and OSHA calls the Outreach Program voluntary. The requirement reaches you through general contractor prequalification, owner contracts, and public agency bid documents, which makes it functionally mandatory on most commercial jobs.

How long is an OSHA 10 or OSHA 30 card good for?

Federal OSHA does not expire construction cards, but replacement cards are only available for training completed within the past five years, and many GCs require retraining on a five year cycle. Treat five years as the working life of a card.

Can my crew take OSHA 10 online?

Yes, through OSHA authorized online providers listed on osha.gov. For field crews I still favor a live class, because authorized trainers can tailor the material to your actual scopes and your crew can ask questions in their own language. My schedule is on the training page.

Does OSHA 30 make my foreman a competent person?

No. Competent person designations come from the employer and require operation specific knowledge plus the authority to correct hazards. An OSHA 30 is a strong foundation, not the designation itself.

What if a worker lost their card?

Contact the trainer or online provider who ran the class. Trainers have 90 days after a course to issue cards and can replace cards for classes held within the past five years. If the class was longer ago than that, or nobody remembers the trainer, the worker retakes the course.