Registered boiler operator apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits California's licence ladder. Updated nightly.
California has 320 registered boiler operator apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 26 counties, 0.1 per 10,000 residents. That is 85.6 apprentices for every 100 employed boiler operators in the state, the rate at which the trade is training its own replacements.
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Registered boiler operator apprentices by county of the apprentice, largest first. Each county links to its boiler operators market page.
| County | Apprentices | Share | Per 10k residents |
|---|---|---|---|
| Los Angeles County | 103 | 32% | 0.1 |
| Contra Costa County | 52 | 16% | 0.5 |
| San Bernardino County | 26 | 8% | 0.1 |
| Riverside County | 23 | 7% | 0.1 |
| Solano County | 21 | 7% | 0.5 |
| Alameda County | 17 | 5% | 0.1 |
| San Joaquin County | 13 | 4% | 0.2 |
| Orange County | 10 | 3% | 0.0 |
| Fresno County | 8 | 2% | 0.1 |
| Sacramento County | 8 | 2% | 0.1 |
| Madera County | 5 | 2% | 0.3 |
| Stanislaus County | 5 | 2% | 0.1 |
| Imperial County | 4 | 1% | 0.2 |
| Napa County | 4 | 1% | 0.3 |
| Kern County | 3 | 1% | 0.0 |
| 11 other counties | 18 | 6% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
The California register ATI reads carries no separate apprentice-tier credential for boiler operators; its ladder for this trade starts at Journeyman (52 active records, read September 16, 2026). Registered apprentices in the county table above are counted from the federal apprenticeship system, not from the licence register.
See how to get a boiler operator license in California for hours, exams and renewal.Sources: registered apprentices: DOL RAPIDS apprenticeship FY2025, active status, as of December 31, 2025; employment: BLS QCEW construction x OEWS occupation share (estimate); licence tiers: California register read September 16, 2026; population: U.S. Census 2023 estimates.
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