Registered plumber apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Iowa's licence ladder. Updated nightly.
Iowa has 1,358 registered plumber apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 88 counties, 4.2 per 10,000 residents. That is 20.4 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 |
|---|---|---|---|
| Polk County | 326 | 24% | 6.5 |
| Linn County | 89 | 7% | 3.9 |
| Woodbury County | 88 | 6% | 8.3 |
| Black Hawk County | 59 | 4% | 4.5 |
| Dallas County | 52 | 4% | 4.7 |
| Story County | 50 | 4% | 5.1 |
| Warren County | 49 | 4% | 8.9 |
| Scott County | 47 | 3% | 2.7 |
| Boone County | 33 | 2% | 12.4 |
| Webster County | 32 | 2% | 8.8 |
| Pottawattamie County | 29 | 2% | 3.1 |
| Johnson County | 24 | 2% | 1.5 |
| Jasper County | 22 | 2% | 5.8 |
| Dubuque County | 21 | 2% | 2.1 |
| Marshall County | 21 | 2% | 5.2 |
| 73 other counties | 416 | 31% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
The Iowa register ATI reads carries no separate apprentice-tier credential for plumbers; its ladder for this trade starts at Journeyman (6,194 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 Iowa Plumbing and Mechanical Systems Board (PMSB), Department of Inspections, Appeals and Licensing (DIAL) issues for this trade: Apprentice, Journeyperson Plumber, Master Plumber, Contractor licence, Service Technician / HVAC Specialty licence. See how to get a plumber license in Iowa 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: Iowa register read September 16, 2026; population: U.S. Census 2023 estimates.
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