Blaster's License - Cal/OSHA

Blasting on a construction job is rare, and when it happens, everyone on the site is inside its reach — not just the crew loading the holes. California controls it at the person. Title 8, Section 5238, says an employer shall not permit a blasting operation unless a blaster holding a current, valid California Blaster's License issued by Cal/OSHA is physically present on the site. This Cal/OSHA Blaster's License Toolbox Talk covers who may blast, how the license is earned and kept, and what the rest of the crew should know on a day when explosives are on site.

Where the boundary of this talk sits#

This talk covers California's blaster licensing and on-site presence rules. Storing, transporting, loading, and firing explosives, and blast-area clearance procedures, are governed by California's explosives safety orders and the blaster's own plan, and are not covered here. Powder-actuated tools belong to their own talk.

The anchor#

Here is the distinction that carries this whole talk: in California a blast is not authorized by the schedule, the superintendent, or the explosives supplier — it is authorized by a person holding a current state Blaster's License who is physically on the site, conducting or directing the shot — so if the licensed blaster is not there, there is no blast, no matter how ready the holes are; and everyone else on the job takes their instructions for the shot from that person.

The rule: a licensed blaster on site#

Section 5238(a) says an employer shall not permit a blasting operation unless a blaster having a current, valid California Blaster's License issued by the Division is physically present on the site to accomplish the blasting operation and/or direct and supervise others in the operation.

Three words in that sentence do the work. Current — an expired license is not a license. Valid — issued by Cal/OSHA, for the kind of blasting being done. Physically present — on the site, not reachable by phone.

Section 5238(e) requires the licensed blaster to show proof of a valid Blaster's License when requested by a Cal/OSHA representative or other authority having jurisdiction.

What the employer must also check#

The license is necessary but not the whole requirement. Section 5238(d) says the employer shall require the licensed blaster to furnish satisfactory evidence of competency in the use and handling of explosive materials, and to have the necessary qualifications to safely perform the type of blasting operations required for the specific worksite. Sections 5238(b) and (c) require the blaster's physical condition to permit safe operations and the blaster to be able to understand and communicate written and oral orders.

Who can get a license#

Section 5238(f) sets the minimum qualifications for an applicant: at least 21 years of age, at least three years of experience in the blasting category being applied for, and meeting the physical condition and communication requirements.

Section 344.20 describes the process. The applicant submits a completed application to the Division, which evaluates the person's training and experience. The applicant must pass a written or an oral qualifying examination given by the Division, with questions pertinent to the license classification applied for, and field tests may be required.

License classes#

Section 344.20 sets five classifications:

• Class A — Unlimited: all types of blasting.
• Class B — General Above Ground: including quarries, open pit mines, and above-ground construction.
• Class C — General Underground: including underground mines, shafts, tunnels, and drifts.
• Class D — Demolition: all phases of demolition.
• Class E — Limited: specific operations noted on the license.

The Division may add limitations or classifications to a license, and licenses are not transferable. A demolition blaster is not licensed for a tunnel heading, and a Class E license covers only what is written on it. The class on the license should match the work being done that day.

Five years, then the exam again#

Section 344.21 says each Blaster's License is valid for five years with renewal privileges. Renewal is handled the same way as an original license, and the examination is required every five years.

Section 344.22 allows the Division to suspend or revoke a license where there is a question or doubt about the blaster's competency, or where the blaster has not complied with requirements, safety orders, or rules. The blaster is given notice and a hearing first. After a suspension or revocation, a new application cannot be filed for six months.

Trainees and everyone else who handles explosives#

Section 5239 says all persons who handle or transport explosive materials shall be trained in the hazards of the job and safe performance of their duties, and trainees conducting blasting operations shall be under the direct supervision of a licensed blaster. A helper who carries the powder is part of the operation and needs the training, even without a license.

California versus federal#

The federal construction rule, 29 CFR 1926.901, requires a blaster to understand and give written and oral orders, be in good physical condition, be qualified by training, knowledge, or experience, know the State and local laws on explosives, and furnish satisfactory evidence of competency. It does not itself issue a license. California does: a state Blaster's License by class, earned by examination, renewed by examination every five years, and required to be physically present at the blast.

Where the duty sits#

8 CCR 5238 requires a licensed blaster physically present, competency and qualifications, proof on request, and the minimum applicant qualifications. 8 CCR 5239 requires training for everyone who handles or transports explosives and direct supervision of trainees. 8 CCR 344.20–344.22 set the application, examination, classes, five-year term, and suspension or revocation. For contrast, federal 29 CFR 1926.901.

What can go wrong?#

• The licensed blaster leaves the site and the crew fires the shot on the schedule.
• The blaster's license expired last month.
• A Class D demolition blaster is asked to shoot rock on an above-ground construction job.
• A laborer carries explosives with no training because "he's just moving boxes."
• Other trades keep working inside the blast area because nobody told them when the shot would go.

How do we manage this properly?#

• No licensed blaster on site, no blast.
• Check the license — current, valid, and the right class for today's work.
• Verify competency for this site — not just the card.
• Train everyone who handles or transports explosives.
• Trainees only under direct supervision of a licensed blaster.
• Follow the blaster's instructions — for clearing, signals, and re-entry.

Before you start#

On a day with blasting, find out who the licensed blaster is, where the blast area is, what the warning signals are, and where you need to be when the shot goes.

Talk it over#

• Who is the licensed blaster on this job, and how would you recognize them?
• What are the warning signals for a shot?
• Where do you go, and when can you come back?

The bottom line#

In California, no blasting operation happens unless a blaster with a current, valid California Blaster's License is physically on site to conduct or direct it. The license is issued by Cal/OSHA after an examination, comes in five classes, lasts five years, requires re-examination to renew, and can be suspended or revoked. Everyone who handles explosives is trained, and trainees work under a licensed blaster's direct supervision.

Frequently asked questions about California blaster's licenses#

Does a licensed blaster have to be on site for every blast?

Yes. Section 5238(a) says an employer shall not permit a blasting operation unless a blaster with a current, valid California Blaster's License is physically present on the site to accomplish the operation or direct and supervise others in it.

How long is a California Blaster's License good for?

Five years, under Section 344.21, with renewal handled like an original license and the examination required every five years.

Can workers without a license help with a blast?

Yes, within limits. Section 5239 requires everyone who handles or transports explosive materials to be trained in the hazards of the job and the safe performance of their duties, and trainees who conduct blasting operations must be under the direct supervision of a licensed blaster. The licensed blaster must still be physically present on the site under Section 5238(a).

Which license class covers blasting on a construction job?

It depends on the work. Section 344.20 lists Class B for general above-ground blasting, including above-ground construction; Class C for general underground work, including shafts and tunnels; Class D for demolition; Class A for all types of blasting; and Class E for specific operations noted on the license. The blaster's class, and any limits the Division has written on the license, should match the shot being fired.

Download the Cal/OSHA blaster's license toolbox talk PDF#

Download this Cal/OSHA Blaster's License Toolbox Talk as a printable PDF in English and Spanish, and review it with the whole site before the first shot.

Related toolbox talks#

• Demolition Safety
• Excavation and Trenching
• Noise and Hearing
• Dropped Objects

Sources#

• Cal/OSHA, Title 8 CCR §5238 — Competency and Qualifications of Blasters ((a) licensed blaster physically present; (b)–(c) physical condition and communication; (d) evidence of competency and qualifications for the site; (e) proof of license on request; (f) at least 21, three years' experience in the category; operative 8-10-2003): https://www.dir.ca.gov/title8/5238.html
• Cal/OSHA, Title 8 CCR §5239 — Training (training for all who handle or transport explosives; trainees under direct supervision of a licensed blaster): https://www.dir.ca.gov/title8/5239.html
• Cal/OSHA, Title 8 CCR §344.20 — Blaster's License, Application and Examination (application, written or oral examination, field tests, Classes A–E, not transferable): https://dir.ca.gov/Title8/344_20.html
• Cal/OSHA, Title 8 CCR §344.21 — Expiration and Renewal (five years, renewal like an original license, examination every five years): https://www.dir.ca.gov/title8/344_21.html
• Cal/OSHA, Title 8 CCR §344.22 — Suspension or Revocation (competency doubt or non-compliance, notice and hearing, six months before reapplying): https://www.dir.ca.gov/title8/344_22.html
• OSHA, 29 CFR 1926.901 (federal blaster qualifications): https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.901

Written by FieldSafetyTalk's safety professional — a CSP, ASP, CHST and OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.

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