Registered boiler operator apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Wisconsin's licence ladder. Updated nightly.
Wisconsin has 60 registered boiler operator apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 24 counties, 0.1 per 10,000 residents. That is 214.3 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 |
|---|---|---|---|
| Milwaukee County | 13 | 22% | 0.1 |
| Racine County | 6 | 10% | 0.3 |
| Dane County | 5 | 8% | 0.1 |
| Rock County | 5 | 8% | 0.3 |
| Waukesha County | 4 | 7% | 0.1 |
| Ashland County | 3 | 5% | 1.9 |
| Pierce County | 3 | 5% | 0.7 |
| Sheboygan County | 3 | 5% | 0.3 |
| Vernon County | 3 | 5% | 1.0 |
| Bayfield County | 1 | 2% | 0.6 |
| Buffalo County | 1 | 2% | 0.7 |
| Burnett County | 1 | 2% | 0.6 |
| Chippewa County | 1 | 2% | 0.1 |
| Clark County | 1 | 2% | 0.3 |
| Door County | 1 | 2% | 0.3 |
| 9 other counties | 9 | 15% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
The Wisconsin register ATI reads carries no separate apprentice-tier credential for boiler operators; its ladder for this trade starts at Inspector (161 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 Wisconsin 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: Wisconsin register read September 16, 2026; population: U.S. Census 2023 estimates.
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