Registered plumber apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits New Hampshire's licence ladder. Updated nightly.
New Hampshire has 734 registered plumber apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 10 counties, 5.2 per 10,000 residents. That is 33.3 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 |
|---|---|---|---|
| Hillsborough County | 213 | 29% | 5.0 |
| Rockingham County | 170 | 23% | 5.3 |
| Merrimack County | 106 | 14% | 6.7 |
| Strafford County | 56 | 8% | 4.2 |
| Belknap County | 49 | 7% | 7.5 |
| Grafton County | 45 | 6% | 4.8 |
| Carroll County | 29 | 4% | 5.5 |
| Cheshire County | 26 | 4% | 3.3 |
| Sullivan County | 25 | 3% | 5.7 |
| Coos County | 15 | 2% | 4.8 |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
New Hampshire records apprentices on its own plumber licence register as Mechanical Apprentice Plumber: 845 active apprentice-tier records against 1,598 journeyman records, a ratio of 0.53 apprentice records per journeyman, register read September 16, 2026. The register's apprentice tier and the federal registered-apprenticeship count in the county table are two different systems: a licence-register apprentice is anyone the state has credentialed to work under supervision, a registered apprentice is enrolled in a DOL-registered program.
Counts are license records, not people: a holder with more than one license appears once per license, and a contractor license is a business, not a worker.
Credential types the New Hampshire Mechanical Safety and Licensing Board, Office of Professional Licensure and Certification (OPLC) issues for this trade: Plumbing Apprentice, Journeyman Plumber, Master Plumber. See how to get a plumber license in New Hampshire 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: New Hampshire register read September 16, 2026; population: U.S. Census 2023 estimates.
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