Registered plumber 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 3,235 registered plumber apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 47 counties, 0.8 per 10,000 residents. That is 6.8 apprentices for every 100 employed plumbers in the state, the rate at which the trade is training its own replacements.
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Registered plumber apprentices by county of the apprentice, largest first. Each county links to its plumbers market page.
| County | Apprentices | Share | Per 10k residents |
|---|---|---|---|
| Los Angeles County | 774 | 24% | 0.8 |
| San Diego County | 491 | 15% | 1.5 |
| Riverside County | 218 | 7% | 0.9 |
| Sacramento County | 170 | 5% | 1.1 |
| Orange County | 152 | 5% | 0.5 |
| San Mateo County | 149 | 5% | 2.1 |
| San Bernardino County | 146 | 5% | 0.7 |
| Contra Costa County | 138 | 4% | 1.2 |
| Santa Clara County | 123 | 4% | 0.7 |
| Alameda County | 116 | 4% | 0.7 |
| Kern County | 107 | 3% | 1.2 |
| Ventura County | 69 | 2% | 0.8 |
| San Francisco County | 61 | 2% | 0.8 |
| San Joaquin County | 55 | 2% | 0.7 |
| Fresno County | 44 | 1% | 0.4 |
| 32 other counties | 422 | 13% |
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 plumbers; its ladder for this trade starts at Journeyman (3,488 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.
Credential types the Contractors State License Board (CSLB) issues for this trade: C-36 Plumbing Contractor. See how to get a plumber 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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