Registered plumber apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Delaware's licence ladder. Updated nightly.
Delaware has 188 registered plumber apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 3 counties, 1.8 per 10,000 residents. That is 13.3 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 |
|---|---|---|---|
| New Castle County | 109 | 58% | 1.9 |
| Sussex County | 51 | 27% | 1.9 |
| Kent County | 28 | 15% | 1.5 |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
The Delaware register ATI reads carries no separate apprentice-tier credential for plumbers; its ladder for this trade starts at Master (927 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 Delaware Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners, Division of Professional Regulation (24 Del. C. Ch. 18) issues for this trade: Master Plumber, Master HVACR, Master Restricted HVACR, Apprentice (registered). See how to get a plumber license in Delaware 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: Delaware register read September 16, 2026; population: U.S. Census 2023 estimates.
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