What the California register actually licenses, how many hold it, and at what level.
As of October 6, 2026, the California state register carries 740 contractor licenses for boiler operators: businesses, and the individuals who qualify them. California does not license individual boiler operators at state level, so this is not a count of workers.
Not comparable per resident: this register licenses CONTRACTORS (businesses and qualifying individuals) rather than individual tradespeople, so this is a count of licensed businesses, not of workers. A per-resident rate and a state ranking are withheld here because they would compare businesses against other states' individual tradespeople.
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“How many boiler operators” has more than one honest answer, and published figures disagree because they count different things without saying so. Here is each measure ATI holds for California, named.
| Measure | Count | What it counts |
|---|---|---|
| Licensed workers on the state register | 740 | Records the register does not mark expired, revoked or surrendered, and that it evidences as a license actually held. This is the figure every ATI surface reports as `current`, and the figure this page leads with. |
| ...of those, explicitly marked active | 669 | The narrower subset a register flags as active. Smaller, because many states publish no status at all and those records are counted above but not here. |
| All license records, active or not | 707 | Includes lapsed, expired and inactive records. Larger, and not a workforce count. |
| Industry employment (BLS QCEW) | 121,076 | Everyone on the payroll of establishments in this industry, including office and sales staff, and counting a person once per job rather than once per license. |
| Estimated workers in this occupation (ATI model) | 374 | Not a published figure: county construction employment scaled by this occupation's share of the metro workforce. An estimate, shown as one. |
| Employer establishments | 12,883 | Physical business locations, not people. BLS QCEW where the county is disclosed, otherwise an ATI estimate on the same occupation share. |
| Registered apprentices | 320 | In a registered program, working toward a license but not yet holding one. |
ATI's headline figure is the first row: individual people holding an active license, counted from the state register itself and refreshed nightly. See methodology and sources.
| State | Licensed boiler operators | Per 100k |
|---|---|---|
| Utah | 1,111 | — |
| Pennsylvania | 793 | 6.1 |
| California | 740 | — |
| New Mexico | 489 | — |
| Arizona | 359 | — |
California is part of 51,348 licensed boiler operators nationally.
Not comparable per resident: this register licenses CONTRACTORS (businesses and qualifying individuals) rather than individual tradespeople, so this is a count of licensed businesses, not of workers. A per-resident rate and a state ranking are withheld here because they would compare businesses against other states' individual tradespeople.
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